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jeting for 450R carb on 400ex
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Posted by: curious george

i had a dyno jet 142 main with the eclip 2 notches down on the needle(mybe three cant remember) and the fual mixture screw turned out 3turns on my stock 400ex carb. i need to know what i need to do for this 450R 04' carb i have it will not run right at all. it is getting to much fuel. it will run like 1/4 throttle if you snap it it will dye and if you give more then 1/2 it will dye out as well in any gear but neutral. i have the fuel mixture srew out 1 1/2 turns.

what should i do please help!

i have an fmf slip on that is it for that modifacations there. closed air box.

Posted by: latheboy

I would try about a 170 main or so. I dunno what that is equal to in a dynojet. I have a 450r carb, full exaust, open airbox and a stage 2 cam and I run a 200 main (keihn). Also, I tried to "rev tune" it when I first put the carb on. That didnt work. Run the stock pilot (48), or maybe a 50. Start with a 160-170 jet and go out and run it. My airscrew is out 2 turns. When i let mine idle, i cannot just snap the throttle open, it will die. BUT when you got out and run it, under load(in gear), it runs awesome. Good luck.

Posted by: ahatcher21

First of all George, I left you a pm and you never replied. I thought you had already done this to your ride and I needed help. I've since then spent the last three weeks tring to get mine going. Here's what I got. I have the stock 48 pilot in it. It is out 2 3/4 turns. It is snappy, no stall. I haven't found out which main I need yet, but I can tell you this. A 170 dyno jet isn't enough jet. I am going to stick with keihin. I figure about a 145 or so. I will know before this weekend is out. Your e-clip should be in slot 3 from the bottom. (needle pointing down) I have a slight stutter in the idle with this pilot jet. I'm going to open the A/F screw another 1/4 turn and see where that puts me. I may go with a 50 pilot and move the A/F screw in more. The stock jet that come in the carb is way to small. It will idle fine and then fall flat on it's *** when you juice it. Also I live in Michigan. Check your altitude against that and make your needed corrections.

Posted by: jsmith2232

I'm putting one in next week but be careful on the conversions between dynojet and kehien there is a chart in one of the jetting forums try a search for it. FYI a dynojet 170 is equivelant to a kehien 190

Posted by: ahatcher21

First of all, I'm not sure why my last post shows up twice, thats crazy. Here's the final results so far. I have a 50 pilot in it, A/F screw is out 3 1/2 turns. I have a keihin 190 main in it. It was ideling smoothly, and was running good through the middle and upper rpm range until I bumped the chip. I'm may go back in and put a 52 pilot in there so I can bring my A/F screw in more, but all in all she running good. Now yesterday in Michigan it was rainy and cool. The temp was around 50 degrees, so I'm sure I have enough main jet. As it gets warmer I may have to bump it down a bit. There is a slight hesitation when you mash the throttle from idle, but it's not to bad. If you have any questions email me at polarisboy21@juno.com

Alan

Posted by: jsmith2232

how noticable are the gains by putting the 450 carb in.

Posted by: latheboy

In my case, VERY noticeable. If your piped, and cammed, you need a bigger carb.

Posted by: ahatcher21

I don't have a cam, but I do have a slip on. I can't really tell yet about the gains. It was raining yesterday and I could only rip it up and down the street. no more than third gear. It feels really good but I'm not for sure until I line up against my buddy.

Posted by: evileyesracing

I dont agree with latheboy, maybe piped, cammed, and bored.. but piped and cammed doesent need new carb. I have a freind who has stock carb on a KFX436 or some bore around that, 13:1 piston, stage 2 cams..

Posted by: evileyesracing

actually there aint a signle thing wrong with it

Posted by: evileyesracing

his money not mine??

Posted by: latheboy

Agree, disagree, thats ok. But if you cam and pipe, you are trying to get air in and out faster. And a bigger carb will also help get air in faster, especialy a slide carb. btw, Im running a 426. lol

Posted by: BORY

what do u think i should u for jets??

mods
416 11:1
hrc cam
p&p
full yoshi
open air box

??????

Posted by: curious george

thanx for the help you guys i am going to buy a 450R dyno jet kit and see how it owrks out for my.

Posted by: jsmith2232

BORY, I am in the process of putting the 450r carb on mine i'll finish it tonight hopefully but i'm starting with a 198 main and stock needle and pilot, fuel screw at 2.5 turns out. i'll keep you posted on how it works.

Posted by: BORY

quote:
Originally posted by jsmith2232
BORY, I am in the process of putting the 450r carb on mine i'll finish it tonight hopefully but i'm starting with a 198 main and stock needle and pilot, fuel screw at 2.5 turns out. i'll keep you posted on how it works.

alright sweet.

Posted by: jsmith2232

I did some fine tuning today after 70 miles of trail riding yesterday with it and ended up using a 205 main, 3 turns out on fuel screw and needle in the 4th spot from top.

Posted by: BORY

quote:
Originally posted by jsmith2232
I did some fine tuning today after 70 miles of trail riding yesterday with it and ended up using a 205 main, 3 turns out on fuel screw and needle in the 4th spot from top.

what kind of jets??

Posted by: latheboy

Sounds comperable to my setup. I have a k200 in now, prob could go to a 205. Did you notice a few more HP?

Posted by: jsmith2232

all of the jets are keihen, and i think i lost a bit of the snap to the bottom end but i definetly notice it when she gets opened up. I just got razr IIs all the way around and with that carb last night i dragged my buddies piped 06 yfz 450 and had him by about 1.5 quad lengths until i was pinned in 5th then he slowly cought up but if it was a 300 foot drag i woulda had him hands down.

Posted by: jsmith2232

I just dropped my needle to the 3rd notch and did a spark plug check with the 205 in it and it looks lean so i put in the 210 and shes right on. has anyone bumped up pilot sizes, i think i need to do that also.

Posted by: Live2Ride300

I'm running the 450R carb on my 440EX.

Ive got a wiseco 11:1 compression 89mm piston.
Hot cams stage 2 cam
Head is ported
heavy duty studs/timing chain

I'm running a 170main jet, needle clip in the middle and 48 pilot and it runs awesome, instant throttle response. Pulls very heard throughout the entire RPM range.

Posted by: curious george

i should be getting my jet kit in the mail today.

Posted by: pmptrk

I have an 05 450r carb on my 426 and have no signs of a rich condition with a 230 main (the biggest available) and 50 pilot. Obviously something is not right. I have the hot start hole plugged with silicone, but air has got to be coming from somewhere. I even tried it with the fuel screw out 3 turns. Still higher on the pilot maybe?? Any suggestions?

Posted by: Live2Ride300

Thats interesting, what brand of jet are you using?

Posted by: pmptrk

keihin jets. The only way I can get it to show rich is to give it a little throttle and put the choke on. Without giving it throttle it immediately dies when the choke is even slightly applied.

Posted by: jsmith2232

I am running a 210 main in my 416 and the plug looks to be nowhere near having signs of being rich, I think i need a larger pilot to help with starting. I still think that my stock carb had more pep to it on the bottom end but the 450r's carb has alot more once shes opened and revving, has anyone else noticed this and also I removed my choke from my stock carb has anyone done this to the 450r's carb?

Posted by: pmptrk

Maybe I will just try going with a 52 pilot and possibly moving my needle a clip. I know there is a difference from quad to quad, but I don't see how it could be this much, maybe it is just the nebraska air???

I think this carb is all around better than stock and haven't even had it jetted right yet. The easier thumb tension was worth the money to me

Posted by: jsmith2232

I'm on the 3rd notch on the needle now, it was at the 5th when i put it in because i never checked to see where it was and it cut out bad doing wheelies so i went to 4th and it got better now it is at 3rd and better yet.

Posted by: flauge

Im thinking about getting me a 450 carb too. Do yall think i would get a noticeable gain from it?? All I have is a pipe and filter for now.. but i plan on getting a cam sometime tho...Would it make a difference on mine?

Posted by: jsmith2232

yes.

Posted by: curious george

i love this carb

Posted by: jsmith2232

quote:
Originally posted by curious george
i love this carb

ditto the above, I had mine up to silver on memorial sunday and never lost a drag to another 400, even ate some 450's. Once the throttle is opened up this carb really eats.

Posted by: curious george

does anybody know if you can wire in the TPS sensor?

Posted by: babiak400ex

Hello! I just install a 450r carb on my 400ex. I cant say that I have noticed a signifigant differnce yet. I would have to say throttle response is better. A little more time to tune it in should prove a more noticeable difference. Maybe when I take it back to the 1/8 mile it will show more of an improvement than I can tell. I have only rode it once out on county rodes though.

Posted by: BORY

do u think going up to a 50 or 52 pilot with a 210 main is to much bc i ordered a 208 210 212 and 50 52 to mess around with. what u think??

Posted by: jsmith2232

no. i'm running a 210 right now and i think i need to go up to a 50 pilot

Posted by: curious george

i am running a dyno jet 112 with the fuel mixture screw out 3 turns and the e clip on the dyno jey needle down three notches. i would like to wire in the tps sensor but have not quit figured it out yet.

Posted by: BORY

i put my 210/50 in last night and took it for a rip but it still seemed like if u were cruising low 1st and punched it it bogged for a little bit then it blasted down the street that normal for u guys??

Posted by: babiak400ex

Just letting whoever might be interested I took my 400ex back to 1/8 mile drag strip with my 450r carb installed I went from a best run last time of a 9.91 sec. @ 63.29 mph with the old stock carb to a best run of 9.50 sec. @ 68.19 mph with the 450r carb.
That is definatly worth the mod to me!

Posted by: jsmith2232

BORY, I don't think that the 450 carb has quite the initial snap that my 400ex carb had but once it's opened up then it definitely added power thru the mid and upper.

Posted by: flauge

quote:
Originally posted by babiak400ex
Just letting whoever might be interested I took my 400ex back to 1/8 mile drag strip with my 450r carb installed I went from a best run last time of a 9.91 sec. @ 63.29 mph with the old stock carb to a best run of 9.50 sec. @ 68.19 mph with the 450r carb.
That is definatly worth the mod to me!

Dammm... that thing cut almost a half a sec off of your 1/8 mile time! i know im getting one now

Posted by: smartypants

You guys running 200+ mains have got to be running rich. I"ve seen 400ex strokers running smaller mains.

I run a 155 in my fully built 416. I started with a 180 and it ran and ran good, I kept going down and it ran better with each size.

Drop the jet and I bet your quads run better than it already does.

Posted by: sixer3

my jetting for 450r carb

210main/48pilot/2 and 1/2 turns on screw

no airbox w k&n and outerwear
stage 1 hotcam
426 no headwork
hmf slip on

SEA LEVEL

as i rose my main jet the hestitation from the crack of the throttle decreased.

the response is really good now and doesnt seem to be too rich at wide-open throttle but i still need to take it out to do plug checks, but the response is so good right now im scared to drop the main!!

Posted by: jsmith2232

I started out at a 198 then 205 then stuck with the 210 I have less hesitation with it and even with the 205 the plug still looked a bit white, now its a nice golden brown.

Posted by: GPracer2500

quote:
Originally posted by smartypants
You guys running 200+ mains have got to be running rich. I"ve seen 400ex strokers running smaller mains.

I run a 155 in my fully built 416. I started with a 180 and it ran and ran good, I kept going down and it ran better with each size.

Drop the jet and I bet your quads run better than it already does.

I can't help but agree. The huge mains just don't seem to make sense.

Posted by: jsmith2232

I know it sounds crazy but with a stock carb i had to run a 170 dynojet, (190kehien) to get it so it wasn't lean.

Posted by: GPracer2500

How are you evaluating lean vs. rich?

I would NOT reccomend plug readings. There is a surprising amount of misinformation about using plug readings for performance tuning and air/fuel ratio evaluation. Most people interpret plugs as being lean when they are not.

Posted by: babiak400ex

I bought my 42mm 450 carb used off ebay I was told it had the hrc mods which consisted of just a 185 main jet. I checked and it was a 185, and differnt needle I believe. The fuel mixture was like 3 turns out, clip in the center. I dont know what the pilot is. Any way I just mounted the carb set up just the way I received it with the exception of adding my dial-a-jet. It idled a little high.It wasnt in the throttle cable so I adjusted the screw on the top of the carb 1/2 turn. I dont even know what it is. I was guessing it was for the adustment of pilot. Anyway it fixed the high rev. I took it to the 1/8th mile I picked up .4 of a sec and 5mph from previous best with the old stock carb. With the 185 jet and dial a jet set all the way lean it is like having a 190 app. It ran great 4 out of 5 passes I made that day till my last pass in the evening it cooled off about 10 degrees from earlier pass I was at the top of 4th gear about ready to shift to 5th and it popped and cut out. indicating to me it was too lean. Moral of my long story is 190 is a little too lean for my appilcation but it is a very easy and adjustible fix with just a click or 2 richer on the dail a jet. and that would put me around 195 or 200 where it seems like most other people are running.

Posted by: babiak400ex

Climate and altitude need to be considered too when looking at someone eles jetting . Arizona and Michigan are definatly differnt climates for sure And I beleive altitudes too. Just the slight drop in temp and humidity made mine run leaner than it had earlier in the day.

Posted by: curious george

my quad was sold with the stock carb so i have a 450R carb for sale.

it comes with the 450R throttle cable($16) and a 450R jet kit(dyno jet kit $65) and of course the carb it self(bought brand new for $180) i will sell all for $200.00 shipped OBRO. i have the jetting set for stage 1 3000ft. no resanible opffer refused either.
my loss is your gain.

Posted by: smartypants

Too many additives in fuel now a days to get an accurate plug reading.

Keep dropping the main until the motor backfires on decel, then go back up 1 size on the main and your good to go. That is a REAL way of knowing the jetting is correct.

Plug readings went out in the 70's and you know it is 2006, correct???

Posted by: acz440ex

I don't know how much a 450r carb costs but I think just under $500 was well worth the money for my Doug Eichner Edelbrock. It does not have any jets. Only a needle. It comes with 3 needles. I had to put the small (lean) needle in mine. From that point on all I had to do was adjust the needle height a little, and that is done externally with no tools. The accelerator pump is adjusted externally too. My power gains were very impressive. I just raced a stock 450r and a Raptor with a full pipe and K&N. I pull ahead by about 3 quad lengths off the line and easily maintain that lead. I can't see any reason to ever use anything but Edelbrock. Oh yeah, I almost forgot. This carb is nowhere near as sensitive to temperature and altitude changes either. I'm tellin' ya. This carb rocks!

Posted by: deepcj7

Can anyone tell me the difference between a hesitation and a bog when trying to tell if your carb is running to rich or to lean? For instance, coming out of a turn and whipping the throttle open to accelerate my bike will stumble a couple of times then get up and go. Thanks guys

Posted by: PismoLocal

What is the stock pilot size on the 450r carb?

Posted by: okbeast

You still got that 450r carb for sale?

Posted by: sburton1

what a good starting poing for my 450r carb

im at sea leavel
mods are full exhausts with pipe, stock bore, uni filter with outerwears "lid off", wb rev box. i just need a good starting point with the pilot and the main so i can order them from jets r us. im guessing a 48 pilot but dont know on the mains does 170 sound to high?? thanks guys

Posted by: PismoLocal

Do I have to plug the hole thats on the top of the carb by the throttle cable hole. I think its for some hot start thing-a-ma-jig. What am I supposed to put in there?

Posted by: AznxXxStunNa

I'm in the market for a new carb. I'm looking to get a trx450r or a Keihin 39mm FCR carb. But from what i can see. trx450r would do very good for the buck. What setting do you guy recommend?(jets) Also dose anybody here got any good setting for the keihin 39mm FCR carb on a 400ex?

Posted by: leadfoot_52

You guys with the hesitation or lean mixture need to put the HRC leak jet in your carbs.

Posted by: GPracer2500

quote:
Originally posted by leadfoot_52
You guys with the hesitation or lean mixture need to put the HRC leak jet in your carbs.

The 04/05 450r carb does not have a leak jet.

Posted by: Def-e-nition

quote:
Originally posted by GPracer2500
I can't help but agree. The huge mains just don't seem to make sense.

As you saw with my bike Gp - Only a dyno can really tell you whats what . Plug readings are simply too much guesswork , im afriad , or I'd have done it instead of forking out the dough for the dyno .

As a sidenote : Gp i took the bike for its first spin after the dyno : brilliantly flipped it , bending the handlebars and landing it on my right hand . Looks like a damn Melon now . Lovely stuff ...

The 155 main works really well in that standard carb , so I have to agree with going down in the sizes. remember that I told you it ran ok no matter what size jet i threw in ? I think the same should surely aply here . the main jet is maybe compensating through size , for other settings elsewhere ?

Overall , between the dynojet 17 suggestion , and then going to 155 main , i am pleased as punch with its performance .
Pity my hand is so Bloody sore after yesterdays 14 minutes in the saddle ....

Posted by: pmptrk

I got mine dynod shortly after I built it to a 426. With the 450r carb, I was using a K185 main, needle in middle(stock), 55 pilot, & 2.5 turns out on fuel screw, because that is what felt the best to me. You can view the dyno results HERE, to see the fuel curve. The guy just played with the fuel screw a little to end up at 1 3/4 turns out, but said my other settings are perfect- so let me know if you have any different input.

Posted by: Def-e-nition

pmptrk that looks fine .

he has done his work properly by leaning the bike out a bit at the beginning , then letting it richen up as you go down the line.
the reason I agree with him , is because some guys tend to aim for the Most power figure of 13:1 from the word Go .
what happens in practice , is that once the filter gets dirty , it starts to richen the mixture even more , so the bike starts running at the wrong A?F ratio , and burns too much unneccesary fuel .

So , he did his work ok . You can chill !! Im sure its not the slowest bike around , at that Hp figure you should be nailing it !

My bike at 31 Hp would take a thrashing from you , but its completely Stock .

Again , Im no expert , but 41 Hp is nice , Gpracer 2500 will be able to brief you better , i find the guy knows what he's on about , and gives good honest advice .

Enjoy the bike .

Posted by: adamsortega

can any1 suggest jetting and pilots for my new carb?...i ride in ny, nj, and pa...i have a 440 kit, stage2 hotcam, yoshimura full system, and no airbox lid...

Posted by: stuntman_12

I have the 05 450R Carb....

Where is the A/F mix screw?

Where is the pilot jet?

Is the main the jet sticking down from between the two floats? If so, mine is a 118??!!

My needle was already set on the third from the top...

Thanks for the help.....

Posted by: stuntman_12

Please help guys... i've had this 416 for nearly 2 months!!! I really want to ride. It still has not rolled for me. I got the R carb on. The pilot is a 48, the main (I Think) is 118, the needle came in the 3rd position and i don't know where the A/F screw is. IT may be missing... i've heard that its on the top.

PLEASE HELP ME OUT... I have yet to even ride this quad... i got away from two stroke b/c of reliablity issues... now i'm frowning at this honda... PLEASE HELP!!! I WANNA RIDE!!!!!!

Posted by: Def-e-nition

Dont blame the honda dude - blame the guy who fitted the carb !!!

usually a 4 stroke is never a headache .

Posted by: stuntman_12

I put the carb on the bike.... i NEED to know where the a/f screw is. is a 118 main jet really big or small for a 416?....

Posted by: Def-e-nition

patience daniel-son , patience ... either one of the 450 carb owners will read your post and help you , or - you could log onto the 450 site , and simply post the queestion again on that side regarding the 450 carb . Sadly i know little about the 450 carb situation on a 400 , or id help out .

The 450 forum should also be better for a quicker rply .

a bike with that carb set properly ought to fly sir .

Posted by: sburton1

the air fuel mixture screw is on the bottom of the carb like an inch away from the main jet nut its the only flat head screw adjustment on the bottom of the carb. as for the main jet it depends on your elevation sea level id start out with a 170 main maby a little smaller and see how it runs from their. id turn the air fuel screw out 2 turns and see how she idles and put the float needle in the middle to start our with. you kinda have to goof with it for a while to get it right and do a search Gpracer is an expert on this subject and has made several posts on the workings of a carb. you have to know how the carb works before you start adjusting it.

laters cole

Posted by: Def-e-nition

quote:
Originally posted by stuntman_12
I put the carb on the bike.... i NEED to know where the a/f screw is. is a 118 main jet really big or small for a 416?....

Make sure also whether its keihin or dynojet sizing dude .

170 , then the guy is talking dyno if Im not mistaken .

Posted by: stuntman_12

Hey sburton 1... is ur name Cole? Just wondering cuz mine is too, ANYWHO.... my sizing is keihin b/c it has their lil half star design on the jets and it says it all over the carb. Thanks for the help guys... yall are helpin more than the 450 guys!!!

Now maybe as soon as my jet kit gets here i can throw in a smaller jet and ride!!!!!!

Posted by: jordan_m6

I have bought an R carb and just thought of the power now. Any body tried this yet.

Posted by: flauge

quote:
Originally posted by jordan_m6
I have bought an R carb and just thought of the power now. Any body tried this yet.

Im wanting to try it, but i cant get myself to spend 100 dollars on it. By the looks of it tho it should help throttle response. I think i do remember a coulple guys round here running em on their 450 carbs. hopefully they'll chime in

Posted by: jordan_m6

one of the guys i ride with has it in his YfZ and he says it helps but since he did all the motor work back in march or so i have not seen him ride it, seems to favor his warrior for the trails.

Posted by: jordan_m6

ok, so it took me about 5 hours total to put the 450r carb on. took me 2 hours to mock up. then 3 hours to get the finish fit, did notice that the carb is a little tall (fixable). left the needle in stock position and put a 175dj in for the main and runs awsome.

The only problem i had was when i first got on to ride forgot to turn the gas on. oops!

I really noticed the difference once i was doing a power wheelie in 3rd. never really could do this in 3rd. thinking of getting a dyno tune after fixing my head gasket leak. think i mis torqed the right side.

Posted by: gorgette

I got stage 1 hotcams
wisco piston stock bore
open air box
450r carb 170 main jet

what should be the correct jetting

Posted by: flauge

Well, i put mine on today and it aint running good at all. It idles real rough, all it'll do is chop and lope. When i give it a lil bit of gas, like 10% it'll be smooth but it'll cough and backfire thru the intake. I let off of it from that and it'll go down to idle real slow and the exhaust will backfire a few times, sometimes pretty loud. I played around with the pilot, started with a 45k and even went down to a 38k. i ran the same every time. Theres a 172k for the main if that helps..
What else could cause this?? Maybe an air leak???If there is one i cant find it..

Posted by: lpmaster

you need to go UP on the pilot and possiblky move the clip down one a 48 pilot or even 50 will do the trick and help eliminate "bog" as well once its dialed in lmk if oyu need more help, while its running spray carb spray on all the boot connections and see if the idle changes, that will tell u if you have an air leak or not

Posted by: flauge

HHmm, i didnt think i'd need to go up to a 48.. I went back to the 45 before i gave up for the day, so i guess it cant hurt to do that.
What about this "hang" that it has when i let off of it.?? When i let off the gas it would take about a couple seconds to get back to idle, popping as it went down. Thats a first for me.

That carb spray trick sounds pretty good also, I'll try that on the next go round.. Thanks

Posted by: mcleod

installed mine today, main jet is 170, 426cc wiseco 11:! k&n filter open box and fmf power core 4 slip-on.

fuel screw 1 3/4
stock slow jet.

Posted by: SSxtreme

Watsup, I got a vacuum leak in my stock carb and have been thinking of buying an R carb instead of gettin a rebuild kit. I have a 10:1 weisco piston, and stage 2 hotcam. Is it worth buying and is it relatively easy to install? What jet size etc. do you guys recommend? and how much should I pay for a carb so I don't overspend. Thanks. Oh yeah and Im from NJ if that makes a diff.

Posted by: flauge

You can get em on ebay pretty cheap, i got mine and a 450r throttle cable for like 70 something $$.., Already setup for a 400ex.. Installation is easy too, just bore out the intake boot and manifold for it to fit..

Posted by: mcleod

http://www.axminster.co.uk/images/products/9415_l.jpg

this gonna be your friend for the installation!

i used it to elarge de air box boots and intake boots a bit, but be sure to remove the intake boot before doing this... bad thing can happend if you dont

paid mine 125 CAN$ with new throttle cable

Posted by: flauge

I used a dremel with a sander roll bit. i had to run it real slow or it would try to melt the rubber.. turned out nice tho

Posted by: NFRASCONE

Just put my R carb on tonight, backfired a few times... probably woke up the neighbors... time to ride it tomorrow and see what it does. I'm running a 175 main so far, I'll probably have to make some minor adjustments.

Posted by: flauge

Good god man, this thing will get it, i mean get it!!! It just turns up sooo fast,its unreal!! I also found out that my stock carb was causing some kind of surging at WOt b/c now its gone with the 450 one so thats a plus too..

You were right lpmaster, I was too lean on the pilot.. I put the 48 in and turned the screw out like 3 turns i think.. Now it runs smooth and it'll rev up soon as i hit it.. One thing tho is that my idle is kinda high, i cant get it to go down either.
Anybody else have a high idle??

Posted by: NFRASCONE

Got everything hooked up and tuned great, kept my 175 and made some minor adjustments. My idle is alittle high as well but not high enough to worry about. Thanks everyone for all the info, it really helped when I put this carb in last night.

Posted by: mcleod

quote:
Originally posted by flauge

Anybody else have a high idle??

just be sure that the throtle goes all way back when releasing it :P

Posted by: flauge

That was the first thing i checked but that looks good. I turned the idle knob back so far it'll turn easy, it still didnt go down tho.. I guess its something i'll have to live with, its not that bad. Its just a tad higher...

Posted by: mcleod

you could be able to play with it a bit with the mixture screw too have you tried it yet?

Posted by: flauge

I didnt think about that... That might have a lil to do with it b/c its still a bit lean on the pilot... I'll probably just go ahead and get a 50 pilot i guess, Im already at 3 turns on the 48..

Posted by: gorgette

hello guys, i need more info about this r carb. It would be nice to have help

. What do you guys mean by 3 turns on the 48 pilot. Do you know what is the stock pilot on the r carb? I just bought it not too long ago. I only play with the main jet. The idle is good it does not rev but the throtle response could be more quick. When i go riding i put it full throtle but it seems to bog a bit to mutch.

- wiseco piston standard bore
- hotcams stage 1
- r carb
- open air box

need more info for jetting. Thank you verry mutch guys

Posted by: skull2002

any dyno runs??? i have seen everything from 165 main to 210 main, 48 to 55 pilot, and on a lot of quads with similiar mods. i know they are all different, but i cant believe to that extreme.

Posted by: pmptrk

quote:
Originally posted by skull2002
any dyno runs??? i have seen everything from 165 main to 210 main, 48 to 55 pilot, and on a lot of quads with similiar mods. i know they are all different, but i cant believe to that extreme.

Check my post on page 5

Posted by: gorgette

pmptrk, I'm not able to see your dyno results view on p.5

Posted by: pmptrk

I should work now, I dont know why/how the thread link got changed.

Posted by: gorgette

yup, its working now. thanks

Posted by: gorgette

Just let you know, my fuel screw is 4 turns out, when i get that carb is this ok. i put it to 3 turns out. should i turn it more in, like 2 turns? any suggestion? thanks a lot

Posted by: peecout

I bought a 450r carb and have a stock 400ex with a pipe and no airbox lid. Do yuo think I should even bother with this carb, or just sell it?

Posted by: hondaracer57

dude deff. use it!!!!

Posted by: AbnMP13

Peecout, I'm interested if you decide to sell it.

Posted by: peecout

I might just try to get some jets and play around with it a little. I will keep you posted though if I do decide to sell it. I have read every post on this thread and I am still confused to where I shoud start with my tuning. HELP!
I was thinking....
50 pilot
2 turns out
E clip #3 from bottom(needle down)
Kehin main???

Posted by: AbnMP13

What other mods do you have?

I may could help on a 400 carb but have never messed with a 450. I would tell ya to start with a setting that you think will be lean, it'll save ya the hassle of fouling/buying plugs and the tell tale sign of being lean is backfiring on decel.

And please do keep me in mind for the carb.

Posted by: scruff_mcruff

quote:
Originally posted by flauge
I didnt think about that... That might have a lil to do with it b/c its still a bit lean on the pilot... I'll probably just go ahead and get a 50 pilot i guess, Im already at 3 turns on the 48..

on a 4 stroke carb in on the screw is richer and out is lean. its opposite of the way it is on 2 strokes. you dont need to go bigger on the pilot. if you think your bike needs more fuel off idle than a 450 your out of your mind.

Posted by: flauge

quote:
Originally posted by scruff_mcruff
on a 4 stroke carb in on the screw is richer and out is lean. its opposite of the way it is on 2 strokes. you dont need to go bigger on the pilot. if you think your bike needs more fuel off idle than a 450 your out of your mind.

Hey i was thinking the same thing you are until i started tuning this carb, but beleive me it needs a lil more fuel than you think.. It still shows some signs of being lean, like some hesitation and a lil popping on decel. It might be the needle tho since the hesitation is around 1/2 throttle so i might try moving the clip down on that.
Btw,its out on the screw to richen and in to lean

Posted by: skull2002

just put on the 450r carb. 185 k main, 55 k pilot , 1 3/4 out on screw. great throttle response,incredible pull thru every gear, and no exhaust pop on deceleration. i run cam2 fuel,110 octane. i took my time, made sure everything fit perfect, took me about 4 hours for complete dissassemble to test ride. it is an upgrade well worth the time!!!!!! and thanks for your help and info pmptrk.

Posted by: wrobben

ive got a 2004 400ex with a k&n no airbox lid, aftermarket cdi box, and a modified stock exhaust basicly just has a 1" hole drilled in the baffle, im getting a 450r carb and just wondering if anybody knows a good spot to start with when jetting the carb for the 400.

Posted by: mcleod

forget about that, i have made a mistake

Posted by: flauge

quote:
Originally posted by wrobben
ive got a 2004 400ex with a k&n no airbox lid, aftermarket cdi box, and a modified stock exhaust basicly just has a 1" hole drilled in the baffle, im getting a 450r carb and just wondering if anybody knows a good spot to start with when jetting the carb for the 400.

Id say start with the stock 48 pilot and put a 170-175k main in. That'll get ya close.

Posted by: Grant Casey

hey my bike is about to get put back together, these r the mods,

11:1 89mm piston
hot cam stage2
port and polish
Uni filter
and a 450r carb that is ready 4 a jetting.

Wat is a good starting point 4 jetting on my 440ex.

my elevation is 400m

Posted by: wrobben

quote:
Originally posted by flauge
Id say start with the stock 48 pilot and put a 170-175k main in. That'll get ya close.

Ok thanks anyone now what 170-175k main is = to in dynojet jets

Posted by: AbnMP13

Check page 2 of this thread

Posted by: EXSailor

Allright guys, first of all I have read this post back and forth several times, and thanks to everyone who has posted on it sharing their knowledge and experience. I just got a steal on an 05 450r carb and let the jetting begin!!! I know what i'm starting with BUT........ I only have Dynjet mains. The carb has a k200 on it and my DJ's will fit but their is a bit of a size difference between the two. Will installing the appropriate jet size DJ main affect anything seeing as it is considerably shorter than the Keihins? see the attached pic to see my dilema.....

Posted by: EXSailor

....The keihin jet is the bottom one

Posted by: flauge

You'll be okay as long as you use Dj's main jet adapter with them, then it'll be the same length as the keihin.... If you dont have it tho you could give Dynojet a call and they'll send you one for like a few dollars.

Posted by: EXSailor

sounds easy enough, thanks for the info. hey flauge, I noticed you're from mid east GA., you been to Durhamtown yet?

Posted by: flauge

Man a few of my buddies went a couple weeks back and did'nt even tell me until yesterday

.They said it was awsome and you'd have to stay more than a day to ride everewhere..Were planning on doing another trip up there sometime so maybe I'll be able to see it then. Actually I want to go there and to Aonia pass and to a few Sorcs races too in the upcoming months. I cant wait!

Posted by: sextonjd99

I installed a 450r carb and I'm having troubles getting it to run right. I've got a full yoshi system and a K&N, 50 pilot, 190 main, 3 clip, 3 turns of air screw.

Ok heres the deal, Easter weekend go riding, 40 degrees or so, ran awesome on the top end but was getting popping and backfiring on decel and was sluggish in low rpms. I pulled the plug and it was white, which i though i means running lean, so i ordered a 52, 55 pilot.

Now last weekend with the same settings as weekend before, will only run with choke on. When i turn the choke off its starts backfiring through the carb. and wont idle, and has actully blown carb out of the boot! I checked the plug now and its all black.

Whats the deal anybody got any idea's or where to start to get the jetting correct?
Thanks in advance
Jason

Posted by: KJS

Same problem lowered to 48 pilot raised to 185 main 3 full turns air screw. No backfire mid range screamer top good bottom good.But it wants to idle a little high fine with me .I am very pleased with results. 9-5-2007 Up to 190 main now still still strong

Posted by: flauge

Ive tinkered with mine as much as i can and it still idles high. I guess its just something we'll have to live with

Posted by: wrobben

idk i think u may have to use the dynojet needle if u use the dynojet mains, my bike wouldnt start with the stock needle and dynojet jets

Posted by: wrobben

also im running a 50 pilot, and a 155 dynojet main with the needle on the third notch from the top,
the 155 is close to the 170 Kehien supposed to be anyways, and i got the pilot screw turned out 3 turns, it idles a bit high so im gonna go in a half turn and c what happens.

Posted by: mcleod

finally fine tune the idle, here is my final setup

50 slow jet
168 main keihen
2 turn 3/4 out on the fuel screw
3 row from the top on the needle

426ex wiseco 11:1
fmf slip-on
k&n filter

no more popping at idle/compression ! start better then a factory 400ex, respond like a beast!

Posted by: EXSailor

And now for my problem, I just test rode my 450r carb setup, here are my configs....stock 48 slow jet, 170dj main, 3 turns on fuel screw, 3rd position from bottom on needle. I tweeked it so it idles pretty good, my plug has a light tanish color on the side electrode, and the color on the ring down inside at the base of the insulator tip is the same color. I honestly don't feel much of a difference in power, and there is a moderate amount of popping on deceleration. I have a similar amount of mods to some other users in this thread, and there jetting is very similar to mine, but they seem to be very satisfied with their results. I don't have any other slow jets, and i've read of other riders making adjustments to that, as well as tweeking the fuel screw, but i've also read that you don't want to go out any more than 3 turns on the fuel screw......any ideas?

Posted by: flauge

Not too sure about the main but you might need to go up a size on the pilot and down a slot on the needle. Im on the same needle position and pilot size as you and mine is on the border of being too lean. I could turn my fuel screw in maybe one turn and it'll start missing bad at idle, so yours should need a lil more fuel than mine scince yours has a lil more motor work done.

Posted by: EXSailor

thanks alot flauge, looks like i'll be trying to get my hands on some slow jets. yesterday I found a k200 main and put that in, ran it and did a plug check. The plug got a hair darker (towards being rich), but my backfiring on decel did't change at all. So amidst my frustration I read another thread from GPracer and I decided to turn my fuel screw out to roughly 4-4 1/2 turns. once I did that my plug turned a faint shade of black, and the popping decreased a little. I think my biggest frustration is the power, I actually think its less than when I started. I useed to be able to do stand up wheelies in third relatively easy, now I am actually fighting to do it in second, not to mention the low end torque I used to have is gone. Oh well, i'll do some more tweeking and hope for the best I guess.

Posted by: flauge

Man, somethings got to be a little bit off if it feels like its lost power. Keep trying on it, when you get it right it'll be worth it

.
BTW Im gonna put a 50 pilot in mine tomarrow and drop the needle down one, so Ill let you know how that goes. Maybe that'll give you a lil bit of reference to where you need to go.

Posted by: feelthisroost11

I have a question..i was looking for a 450r carb for my 440ex and i came across a 03 crf 450 carb and i was wondering if it was a trx related carb? Would it be the same installation as a trx carb?Do i need any adaptors if so? Thanks

Posted by: flauge

Welp, i went from running perfect to running crappy again.. Before i messed with anything I was running a 48 pilot, needle in the middle, and a 172k main.. That was with 5 discs and a quiet core in my e series. Now I took out the quiet core and went up tio 13 discs and its running too lean. Blip the throttle and it'll hesitate, let off the gas it'll pop bad on decel. So... i went to a 50 pilot, went down a clip on the need, and poped a 175k main in. Its still doing the same thing.. Now i know its lean, but what should i adjust? Id figure the pilots okay scince i see a lot of people on here running the same pilot and they've got more built motors than mine. The needle oughta be ok. So would the main cause the poping on decel if it was too lean? I always thought it was the pilot.

Also, if i hold the gas a lil bit above idle, it'll get really rough. It'll start snorting and skipping and sometimes cut off. AInt too sure what that is either but it aint good

Posted by: sextonjd99

Thats the same thing mine did! I never did get it figured out, i just put the old one back on. If you get it figured out post up what you find.

Posted by: flauge

Will do.. Im not gonna give up on it just yet b/c it ran perfect before so i know i can get it right again

Posted by: jsmith2232

It may sound rich but right now I'm running a 198k main and 48 pilot with the build listed in my sig, I was all the way upto a 210 main and I never fouled a plug but it was a big boggy. I will probably try going to a 190k main but right now she starts right up with no choke, Idles like a champ and doesn't pop on decel, and throttle response is awesome.

Posted by: flauge

See, thats what i dont get.. youre on the 48 pilot with a 416 build like that and its running good, but mine will still pop on decel. Maybe I should go up on the main i guess.

Posted by: jsmith2232

Try turning your fuel screw out to 3 1/2 turns.

Posted by: flauge

I think im at 2 1/2 to 3 turns right now, I'll try 3 1/2 turns this weekend, and mabye a 180k main before i race. You dont think it'll be too rich at WOT with that main do you? I kinda doubt it...

Posted by: jsmith2232

I don't think a 180k would be too rich at all, when I had my stock carb she was dialed in with a 170 dynojet equivelant to a 190k, I haven't run anything less then a 198k with the 450 carb and she hasn't fouled a plug yet.

Posted by: flauge

Cool, i didnt really think it'd be. I guess Im just kinda paranoid about running out of gas at my first xc race. That'd be kind of a bummer.

Posted by: r-exrider0003

hey can any one help me out with proper jetting on a 426 with a hotcam stage 2 and a white bro promeg full system, k&n with no box ... i m located in IN 47125... thanks for any help...

Posted by: Ruby Soho

what jetting you think i should put on the 450r carb with the wiseco 11:1 440, hotcams stage 3, stock exhaust?

Posted by: bigmikey119

OK I have a 165 main 42 pilot needle 4th notch down were should this put me on a 05 450r carb plz help!

Posted by: jsmith2232

You can check my jetting in my sig, I've had it running like this for almost a year and a half from temps below zero upto 95 deg F. and it always has excellent throttle response, no bogging, plug looks great and It hangs with most of the 450s.

Posted by: choco

quote:
Originally posted by curious george
my quad was sold with the stock carb so i have a 450R carb for sale.

it comes with the 450R throttle cable($16) and a 450R jet kit(dyno jet kit $65) and of course the carb it self(bought brand new for $180) i will sell all for $200.00 shipped OBRO. i have the jetting set for stage 1 3000ft. no resanible opffer refused either.
my loss is your gain.

This still for sale?

Posted by: choco

quote:
Originally posted by curious george
my quad was sold with the stock carb so i have a 450R carb for sale.

it comes with the 450R throttle cable($16) and a 450R jet kit(dyno jet kit $65) and of course the carb it self(bought brand new for $180) i will sell all for $200.00 shipped OBRO. i have the jetting set for stage 1 3000ft. no resanible opffer refused either.
my loss is your gain.

This still for sale?

Posted by: Wheelie

Figured I'd add my results, as I completed the 450R carb install last weekend.

440 stroker 11:1 compression, HC Stg 3, P&P Head, Full Yoshi exhaust, K&N Filter--no lid. Right now it has a 50 pilot, mixture screw out 2.5 turns, needle in stock location and a 190 main. It's close to spot on.

To anyone that hasn't done this mod yet, or are contemplating it. DO IT!! It's easy to install, and the power gains can't be beat for the $$.

Posted by: medicdude

nice setup wheelie. lol.
what altitude are you running at?

and i thought ii'd contribute.
see my sig for my setup.

Posted by: Wheelie

Looks like we have similar setups, although your quad is a big bore--mine is poked and stroked (416/87mm piston, with a +4mm stroker).

I ride dunes and mountains, from 0-5000ft on a regular basis. The 190 is close at 3000ft. A 195 will be installed before my trip to Winchester Bay, OR this weekend.

Posted by: peecout

I just got back from Winchester! Your gonna love it, weather was perfect!

I am still trying to figure out a good starting point as far as jetting with this carb on a stock 400ex with a pipe and K&N with open airbox??? Any suggestions?

Posted by: medicdude

you guys need to post the altitude range and temp range you ride in, to get even a ballpark jetting figure.

Posted by: Ruby Soho

ok guys, im picking up an 04 stock 450r carb in a few days. comes with stock jets.

my current engine mods are:

11:1, wiseco 440 piston, and hotcams stage 3 cams. with a stock exhaust, and a UNI air filter lid on.

elevation is about 585ft, the basic temp i ride in now is 60 degrees, and winter gets from 10-40 degrees. spring/summer is usually 75-80 degrees

what sizes do you think i should run?

Posted by: skatrdude20

Any suggestions as where to start with the jetting for a 450r carb.

Mods-
Namura 440 Kit
Stage 2 Hotcam
Unifilter
Full HMF Exhaust

I need somewhere to start

Posted by: dpiza

ive read every single post trying to find one that would help me, couldnt really find one. Heres what i got 2003 400ex with supertrapp exaust, uni filter with lid, big gun rev box, stock piston for now, am goin to a 416 10.8 to 1 and a hot cam stage one soon. I just got a 05 450r carb and am lost on what to jet everything at. I live in central florida and very occasionally ride in georgia, so there is not a whole lot of elevation. any info would be great. thanks

Posted by: EMX5636

So after reading through this thread numerous times, I finally get to add my .02. I just got finished installing the carb, and got to ride it and play with the jetting today. So far I'm sitting at a 50 pilot, around 2.5 turns out, 4th clip from top needle, K200 main but I'm bumping that up to a 205-210 tomorrow. I'm fairly confident in the way it runs now, good idle control, good midrange, little to no hesitations, just seems a bit lean top end. Some popping on decel hence the main increase. I'll update tomorrow after the new main goes in.

Justin W

engine mods are 440, hotcam, sparks exhaust, k&n w outerwear, no lid...

Posted by: EMX5636

Alright, so my popping on decel i think wasnt' a good deciding factor for lean because i dropped the 205 in it, even raised the needle from the 4th to 2nd clip from top, and the popping got worse, with a flame every once in a while, so i think i'm actually a rich pop, which doesn't make sense to me....

Does anyone have any other rich/lean tips besides popping... I'm gonna throw another plug in it, and check that, but I'm kinda stumped.

Justin W

Posted by: zrpilot

quote:
Originally posted by EMX5636
Alright, so my popping on decel i think wasnt' a good deciding factor for lean because i dropped the 205 in it, even raised the needle from the 4th to 2nd clip from top, and the popping got worse, with a flame every once in a while, so i think i'm actually a rich pop, which doesn't make sense to me....

Does anyone have any other rich/lean tips besides popping... I'm gonna throw another plug in it, and check that, but I'm kinda stumped.

Justin W

If your needle is on the second from the top going down then you have justed leaned it out. I would try a 50 pilot and the needle back on the middle position and a 175 main.

Posted by: EMX5636

I know i leaned it out with the needle... I had the needle in the 4th where it was with the 200 jet, and it was worse, so i figured i'd try to lean it back a bit towards the 200, but it still does it. I'm gonna drop back down to the 195 that the carb came with for right now, and then see how it runs, then I'll get a couple more jets and go from there. Thanks though,

Justin W

btw, i already have the 50 pilot in it.

Posted by: EMX5636

and one more thing i remembered. I pulled the jet out of the 400ex carb and the main was a 158. Same mods. So I don't know if that helps anyone. Ran great before. Hopefully I can get it running like that again.

Posted by: EMX5636

Alright, so went back down to the 195 main, needle still 2nd from top. Plug doesn't look white, but does look like it's running kind of hot. Slight orange color on the end of the plug. Any ideas what's up with this? I am going to try raising the needle up one or two notches and see where that goes. Runs strong though...

Posted by: zrpilot

Put that clip on the needle on the middle position!!!!

Posted by: cmaxx

ok i just bought a 450r carb.i have a white bros e seris slip on,416 piston,removed air box,uni filter,i think thats it.what jets should i run?and do you think ill notice a big difrence?please help me.and what other mods should i do to it?

Posted by: BIGKURT666

ware can i get a good jet kit i cant seem to find one lol n what do u guys think i should run with my set up?

Posted by: scruff_mcruff

i just got done with the first trial run with a 42mm 450 carb, and that thing rips. my motor has a stock bore 11:1 piston and new HC stg 2 cam, with a White Bros. promeg headpipe and my own custom dual exhaust. i kept the stock jets in it and had the idle screw 1.25 turns out. thing ran like a champ never once sputtered or popped in a 30 min run. the main is a little fat but i like running the air cooled motors that way. its the first time since the stg 2 cam the front end would stand up coming out of turns and i use 16-38 gears w/ 18/9.5 tires. i live 25 ft above sea level and it was about 45deg today. hope this info helps someone out.

Posted by: Hondamaster5505

quote:
Originally posted by scruff_mcruff
i just got done with the first trial run with a 42mm 450 carb, and that thing rips. my motor has a stock bore 11:1 piston and new HC stg 2 cam, with a White Bros. promeg headpipe and my own custom dual exhaust. i kept the stock jets in it and had the idle screw 1.25 turns out. thing ran like a champ never once sputtered or popped in a 30 min run. the main is a little fat but i like running the air cooled motors that way. its the first time since the stg 2 cam the front end would stand up coming out of turns and i use 16-38 gears w/ 18/9.5 tires. i live 25 ft above sea level and it was about 45deg today. hope this info helps someone out.

You have any pics of the custom dual exhausts!

Posted by: scruff_mcruff

quote:
Originally posted by Hondamaster5505
YO You have any pics of the custom dual exhausts!

they are up in my myspace profile, havent had time to try and get then up here.

Posted by: Hondamaster5505

dude, thats so awesome! Looks like a pretty neat installation.

How did you get the 2 pipes to go to the header?

Posted by: scruff_mcruff

i just made my own collector, pretty simple stuff after building headers for cars.

Posted by: sdime400

Anyone have jet settings for a 2000 400 ex w/ Rev box, full exhaust, stage one cam, and fully opened K&N for the 450r carb. And which jet kit would be the best.Gearing if anyone has it. Thanks

Posted by: mxpimp2000

i have a 426 big bore kit on my 400ex with shaved fly wheel high comp. piston valve work and hot cam. i have a crf450 dirt bike carb on mine with no airbox lid you wouldnt believe the power it has ive raced 450's moded up and still smoke them no problem ive rode plenty 400ex's and 450's but none compare to the power the 426 has it will scream!!

Posted by: PowerMadd789XC

hey guys, watsup , i was just wondering if anyone knows what the jetin would be for my stock 400 engine wiht a 450r carb and full lrd exhaust, and also dont run an air box , bc it wont run right with it on! i used to have a 440 kit but my crank snapped and shattered my case .. but if anyone can help me or give me any idea to get it close, id appriciate it , thankzzz!

Posted by: AZ440ex

Hey everone,

Did anyone ever run a stock carb that has been ported then switch to a 450 carb? Any gains or loss?

I run my 440 with a pretty heavily ported stock carb and wonder if a 450 carb might be better.

Posted by: TRX406EX

r 04-05 and 06+ 450r carbs the same?, if not, which is best?

Posted by: zrpilot

The '04-'05 carbs are the ones eveyone is running. The '06 and newer are FCR flat slide and are different then the '04-'05.

Posted by: flauge

quote:
Originally posted by PowerMadd789XC
hey guys, watsup , i was just wondering if anyone knows what the jetin would be for my stock 400 engine wiht a 450r carb and full lrd exhaust, and also dont run an air box , bc it wont run right with it on! i used to have a 440 kit but my crank snapped and shattered my case .. but if anyone can help me or give me any idea to get it close, id appriciate it , thankzzz!

Start with like a 50-52 pilot and maybe around a 180 something main. That'd be a good starting point.

Posted by: cincy250R

ok i have a 450r carb with a
175k main
48 pilot
needle clip in the middle
screw 2 1/2 out

sparks X6
no airbox lid
stock other than that

it idles really high when i let off the throttle and another thing i noticed was my header was glowing.... i know usally that means your running lean but i don't know what everyone elses is doing and it will hicup out of the intake when it is cold

it doesn't have an air leak i sprayed the boot while running with carb cleaner

-Dave

Posted by: zrpilot

quote:
Originally posted by cincy250R
ok i have a 450r carb with a
175k main
48 pilot
needle clip in the middle
screw 2 1/2 out

sparks X6
no airbox lid
stock other than that

it idles really high when i let off the throttle and another thing i noticed was my header was glowing.... i know usally that means your running lean but i don't know what everyone elses is doing and it will hicup out of the intake when it is cold

it doesn't have an air leak i sprayed the boot while running with carb cleaner

-Dave

Dave,

What is the temp? If cold (probably

) don't forget to put 1-2 bigger mains to compensate for temp. Also drop the needle clip one notch (raising the needle)

Also try a 50 pilot then readjust fuel screw

Was it at night when you saw the header? If so, this is not unusual.

Mike

PS: I'm at a 175 with a 50 pilot and the needle clip DOWN one notch at 70F!!!!

Posted by: cincy250R

well i was in my garage and just noticed that they were glowing but it was idling for like 10 min as i was trying to adjust the pilot screw but how do you find your elavation(spelling) and it's about 25-30 degrees out....another problem is that i can't ride ether cause i don't have all my suspension back yet.... sooooo i guess i'll just have too mess with it some more

-Dave

Posted by: zrpilot

OK, that helps.

First the exhaust will GLOW if there is no air moving past it!

Second Bump that main up at least 1 maybe 2 sizes and raise the needle one notch until the weather warms up.

And a new #50 pilot would help as well.

Elevation - I just googled my town and its elevation. IMHO elevation where you and I live does not have as big an influence as temperature does on jetting.

Posted by: flauge

quote:
Originally posted by cincy250R
well i was in my garage and just noticed that they were glowing but it was idling for like 10 min as i was trying to adjust the pilot screw but how do you find your elavation(spelling) and it's about 25-30 degrees out....another problem is that i can't ride ether cause i don't have all my suspension back yet.... sooooo i guess i'll just have too mess with it some more

-Dave

Yep, get a 50 pilot and try around 2-3 turns. You just might need a 52 because of your temp.
Im on 175K and 50 pilot right now and below 50 degrees mine starts popping on decel so yours might do the same b/c of where youre at.
Id get a 52 just in case.

Posted by: fast2007

MXpimp wish you lived closer I have a nastly little 416,,but We have a piped yfz450 and No 400ex without a lot of work will out run it..Period!!We can maybe hook them up when we come up to W.V. in March...Just for fun

PS Im putting a 450r carb on now ,but with my slip on and stock carb I out ran some 450's on bottom and topend,butnot that yfz..LOL

Posted by: fast2007

Now my probs...Just put it on and im at sealevel..NC Anyways it pops back bad at idle on deceliration..(Reving) It has a 52 pilot and 178 main,but revs good...Ver little hesitation at all and that was with nothing hooked to the carb...

Posted by: fast2007

450 carbs ion ,but I lost alot of bottomend (Dont wheelie like it did)and it seems to pull alittle better up top..I had a 200main in my stock carb and no hesitation or nothing pulled hard everywhere..Any idea's is the main to small ,considered I got a 178main in 450r carb and 52 pilot??I pops back bad off excelleration..real bad,maybe to lean??Info would be nice..

Posted by: zrpilot

quote:
Originally posted by fast2007
Now my probs...Just put it on and im at sealevel..NC Anyways it pops back bad at idle on deceliration..(Reving) It has a 52 pilot and 178 main,but revs good...Ver little hesitation at all and that was with nothing hooked to the carb...

When you say, nothing hooked to the carb, what do you mean? Is there and airfilter on it? If not, that will make the whole jetting thing funky!

What other mods do you have? Where is the needle set at? I have a 416, ported, HRC cam, SParks exhaust, and I'm running a 175 main with a 50 pilot and it is VERY close to spot on at 70F!

Posted by: Ruby Soho

k guys i got an 04 450r carb.

what would you guys think would be a good estimate for my mods?

11:1 440
hotcams stage 3 cam
white bros mx4 slipon
uni filter

Posted by: zrpilot

quote:
Originally posted by Ruby Soho
k guys i got an 04 450r carb.

what would you guys think would be a good estimate for my mods?

11:1 440
hotcams stage 3 cam
white bros mx4 slipon
uni filter

50 pilot
180-185 main
needle on th 4th notch

Posted by: fast2007

Carb right or wrong??It pops back bad on deceleration..I weigh 190lbs and I ran today at farmington dragway in NC..It has full nobbies and a 416(11.1),my head..(It works)stage 2 cam ,slip on jardine,16 tooth and 450carb which probably is to lean..Anyways I am at stock height and I wheelied real bad ,but still ran a 9.10@72.58 mph..(With that much Mph it will run 8.60-8.70)what ya think??Oh yea that asphalt track..Need more fuel??Its forsale $2200 Imagine if it had a full system...

Posted by: madmark tc440ex

need some suggestions from ones with a similar set up.

TC racing 440 bore 11:1
TC pro cam (biggest he makes)
TC exhaust (supertrap without discs, tip on end)
TC port and polish
TC lightened flywheel

live in KY and ride in temps from 60 to 100

Thanks for the help!

Posted by: r-exrider0003

zrpilot
do you think you could help me.
im running a 11:1 prox piston, bored to 426, ported, hotcam stage II, white brthers promeg full syst.
i recently got it all back together with the new carb.
im not sure on needle pos, air fuel screw, or pilot, just that i have a 170 dyno jet in.
what do you think i should change to, its running reallly rich.

Posted by: zrpilot

We need to determine some things:

1) what pilot is in it?
2) More then likely it is a Dynojet needle?

I can only help using Kiehen jets, as don't know the Dynojet system. Sorry.

Posted by: r-exrider0003

well i was planning on getting away from dyno jets anyways, and was going to get some regular one maro. what size do you think i should start with?

Posted by: zrpilot

quote:
Originally posted by r-exrider0003
well i was planning on getting away from dyno jets anyways, and was going to get some regular one maro. what size do you think i should start with?

I'd get a 50, and 52 pilot. A Stock needle. 170, 175, 180, 185 mains.

I'd start with the 50 pilot, the 180 main and the needle on the 4th from the top.

Posted by: fast2007

Myne runs good ,but on decelleration it pops back bad!!!!To lean maybe..When its cold it spits back threw the carb..52 pilot/178 main..What ya think??I just enjoy killing 450's with pipe etc..(Mild work)

Posted by: zrpilot

quote:
Originally posted by fast2007
Myne runs good ,but on decelleration it pops back bad!!!!To lean maybe..When its cold it spits back threw the carb..52 pilot/178 main..What ya think??I just enjoy killing 450's with pipe etc..(Mild work)

A 52 pilot should be OK, have you backed your fuel air mixture screw out a couple of turns?

Posted by: fast2007

Yea its like 3-3.5 turns..To lean to on the back firing on decel?

Posted by: zrpilot

3-3.5 turns is to many.

1) check for intake and ot exhaust leaks
2) get a 55 or 58 pilot and re-adjust the fuel screw.

Posted by: r-exrider0003

okay. so last night i put in stock needle, on the fourth clip down from the top, put in a 170 main, turned air fuel out 2.25, and didn mess with pilot
it is still running terrible.
like with the choke on itll idle up like a 450 and run alright, and i eventually got it to idle like normal with choke on if i put my finger over the hot start hole. Also, what should i do to close this hole up? or leave it open?anyways, it wont run good at all with the choke off, it wont idle, and if i try to give it gas it spits and sputters and backfires. thanks alot for all the help zrpilot. im going to order i pilot today, you think a 50 or 52 will do?

Posted by: zrpilot

quote:
Originally posted by r-exrider0003
okay. so last night i put in stock needle, on the fourth clip down from the top, put in a 170 main, turned air fuel out 2.25, and didn mess with pilot
it is still running terrible.
like with the choke on itll idle up like a 450 and run alright, and i eventually got it to idle like normal with choke on if i put my finger over the hot start hole. Also, what should i do to close this hole up? or leave it open?anyways, it wont run good at all with the choke off, it wont idle, and if i try to give it gas it spits and sputters and backfires. thanks alot for all the help zrpilot. im going to order i pilot today, you think a 50 or 52 will do?

When you installed this did the hot start hole get plugged?
Is there a spring holding the plunger down inside the hot start mechanism?

Please refer to my installation notes for pictures and answers.
My 450R installation

I would get a 52 pilot....

Posted by: r-exrider0003

no it's totally open.
i didnt know you had to plug it?
could you go into more detail on how you pluged yours?
i need a hotstart cable as well?

Posted by: zrpilot

quote:
Originally posted by r-exrider0003
no it's totally open.
i didnt know you had to plug it?
could you go into more detail on how you pluged yours?
i need a hotstart cable as well?

See the previous post for a hot link to some instructions.