[installed the 450R carb and WOW.....!!!] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

Pages:1 2

installed the 450R carb and WOW.....!!!
(Click here to view the original thread with full colors/images)

Posted by: dick-84

If i change my piston to 11.1 and port and polish my head put the 450r carb on there what should i run for gas? I am at sealevel.

Posted by: boosted3g

52 works great and im only at 2 turns on the fuel screw. I would go to the 52 that way you still have adjustment with the fuel screw incase it gets cold you can turn it out some.

Talk with zrpilot he is a member here about the adapter. He posted in the thread recently and is always in the 400ex forum.

Posted by: zrpilot

Here is a link to my installation using an adapter.

450R carb install

Like boosted3g said, makes the carb install alot easier.

PM me if interested in one.

Posted by: dick-84

Thatnks alot. Ill have to look at that when i get time out side of work. They have alot of stuff bolcked so i cant see the pics.

Posted by: damon#6

y didn't u just cut a bunch of holes in the air box insted of just takein it off then i wouldn't have to tie in down to the frame

Posted by: khen

quote:
Originally posted by dick-84
If i change my piston to 11.1 and port and polish my head put the 450r carb on there what should i run for gas? I am at sealevel.

11:1 is always the borderline on race fuel for the 400EX. I rode the dunes hard on premium gas(92 octane) and it pinged badly and ultimately pulled my head studs and I'm at 4k feet. I would run at least 50/50 race gas, or 100 octane.

Posted by: flauge

I went and double checked how many turns out I had on my screw and found that I screwed it out 4 turns and didnt even know it.! Anyway I just got me a 52 pilot. How many turns out would be close to what i had on the 50? Im thinking maybe 1 1/2 or something. And since Im switching from the e series to an hmf slip soon Im thinking about going up a size or two on the main. Im at a 175K now, How's a 178K or 180K sound to yall? I had 10 discs and a quiet core in the eseries and the hmf isnt going to have any q/c. 180K probably is a better starting point, right???

Posted by: BigBore24

ok got my carb installed last night. install went pretty easy but i didnt know not to ream out the boot that goes onto the motor from the carb. i got the carb on there and put the clamp on real tight. the jets in the carb were a Keihn 182 main and a 50 pilot when i bought it so i left it that way for my 440 with below mods. also the needle was in the 4th slot from the top. the problem is the thing idles like crap, it backfires through the exhaust and the carb. when i rev it, it sounds better and it revs up pretty fast but i dont have my thumb throttle yet so i cant ride it yet. any suggestions on the idle and jet suggestions would be appreciated. im gonna test it tonight to see if i have a air leak around the carb to motor boot. i just dont see that carb going in that hole without doing some boring. also the motor seemed to get hotter than it did before. may b lean?

Posted by: riderssb250x

hey guys i got a question i have a 440 bore and baldwin racing port and polished head and i got the 450 carb on it ( i bought the quad like this) and its making like a kinda loud leak noise almost like a pop leak kinda noise so i listened to to the engine and came to fingd out the noise was coming from the carb any of you guys ever have this problem like do your quads make a nosie when its idling with the 450r crd please help me out

Posted by: sc400ex_rider

sounds like a vacuum leak. is it idleing high? make sure your hot start hole is pluged off good.

Posted by: REDRIDER312

just recieved my 450r carb yesterday and installed the adapter i bought from Zrtpilot.....went on easy and looks great.....but what do you do with the electrical connectors coming off the carb ?? just cut them off or what ...........

Posted by: zrpilot

Yep, I cut mine. You could also zip tie them outta the way. Whatever works best for you. They are not needed.

Posted by: REDRIDER312

THANKS ZRPILOT.....and Thanks for the adapter.....It made everything ALOT easier !!!!

Posted by: zrpilot

No problem, enjoy your 400EX with its new power!!!

Posted by: REDRIDER312

Now I need some expert advice on the jetting......

Posted by: Ruby Soho

got a quick question

when reaming out the boot from the engine to the carb, are you suppose to ream out the small ledges, or what.. i dont want to do this wrong...

Posted by: zrpilot

A couple reminders:
1) you have to do some sanding/grinding on the carb and the intake boot. I found that a Dremel with the sanding drum is the best way to do this.
2) You will have to sand the cast ridges on the air boot side of the carb. First use masking tape, tape EVERY opening into the carb to prevent junk from getting into the carb. Then using the Dremel begin sanding these cast ridges. I found it was easiest to go around the surface by letting the dremel "pull" itself around, CAREFUL!!! go slowly and trial fit the adapter. You want a "press" fit of the adapter onto the carb. The more consistent the sanding is around the perimeter the better, in other words try to NOT have high or low spots. Then, using some RTV, apply a light coat on the carb and the adapter and press them together. To do this I used a rag covered bench vise. Let them sit for the RTV to fully cure (overnight) then using a finger nail, remove the excess.
3) You will then have to sand the air boot that is attached to the engine. To do this I think it is easier to remove this from the engine. Again using the Dremel and sanding drum, go slowly around the inside perimeter allowing the sanding drum to pull itself around. Go slowly, trial fitting the carb until you get a snug fit. DO NOT remove all the ridges, just enough so the carb is a snug fit! Be sure to clean this once your done sanding.

My number one recommendation is GO SLOW ON ALL SANDING! I'm sure you will do a FINE job!

Posted by: Ruby Soho

alright thanks zrpilot! your a great help!

i guess ill wait till tommorow night, because my dremel is at my school auto class

i should be able to get it done though and ill will update you!

Posted by: zrpilot

Let us know when you get it running!

Posted by: 400ex28

what year 450r carb is the best to run?

Posted by: zrpilot

quote:
Originally posted by 400ex28
what year 450r carb is the best to run?

For sure the '04-'05!!!!

Posted by: saphunt2r

I have a 416 with a wiseco 11:1 comp, hotcam stage 2, big gun pip, fresh valve job with new valves And a K&N filter with open air box…I have a 450r carb but need a starting point with the jets here in wisconsin...Any help would be great..

Posted by: Ruby Soho

wow!!!!!!

i got my carb on and running

WHAT A DIFFERENCE!!!!!!!

i totally recommend this to ANYONE with an EX

Posted by: zrpilot

quote:
Originally posted by Ruby Soho
wow!!!!!!

i got my carb on and running

WHAT A DIFFERENCE!!!!!!!

i totally recommend this to ANYONE with an EX

I'm so glad it worked well for you!

I had the EXACT same comments when put mine on!

Posted by: NoRCaL440EX

Does anyone know how to tell which year of 450r carb it is? I bought mine off Ebay a while ago and forgot what year the guy said it was off. also any good sugestions on which jets/ jet kits to use?

Posted by: zrpilot

quote:
Originally posted by NoRCaL440EX
Does anyone know how to tell which year of 450r carb it is? I bought mine off Ebay a while ago and forgot what year the guy said it was off. also any good sugestions on which jets/ jet kits to use?

if the slide is round, then it is an '04-'05 carb.

Posted by: NoRCaL440EX

oh ok good to know, also I just picked up a 99 with a blown motor that had a 39mm FCR carb but when I pulled it off the 2-3" peice the goes in between the plastic intake on the motor and the carb itself to make it long enough I'm guessing was completely stripped where it threads into the carb, I would have liked to see how it worked any idea where to get parts for these carbs?

Posted by: zrpilot

quote:
Originally posted by NoRCaL440EX
oh ok good to know, also I just picked up a 99 with a blown motor that had a 39mm FCR carb but when I pulled it off the 2-3" peice the goes in between the plastic intake on the motor and the carb itself to make it long enough I'm guessing was completely stripped where it threads into the carb, I would have liked to see how it worked any idea where to get parts for these carbs?

www.sudco.com

Posted by: Ruby Soho

hey zr, my carb is on and runs good but theres a few problems.

1. it backfires (wouldnt call it backfire.. but theres pressure that pops through the intake system and actually moves the hole assembly) at idle.

2. im not sure what this could be, but when you hit the throttle it idles up but then stays somewhat high idle by itself then eventually goes back down.

3. it pops alot on decel... heres a little video of the popping, and you can tell when im in my yard, im just blipping the throttle the least bit and its all high strung.

<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/fIF1myS9fyc&hl=en"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/fIF1myS9fyc&hl=en" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>

Posted by: zrpilot

quote:
Originally posted by Ruby Soho
hey zr, my carb is on and runs good but theres a few problems.

1. it backfires (wouldnt call it backfire.. but theres pressure that pops through the intake system and actually moves the hole assembly) at idle.

2. im not sure what this could be, but when you hit the throttle it idles up but then stays somewhat high idle by itself then eventually goes back down.

3. it pops alot on decel... heres a little video of the popping, and you can tell when im in my yard, im just blipping the throttle the least bit and its all high strung.

<object width="425" height="355"><param name="movie" value="http://www.youtube.com/v/fIF1myS9fyc&hl=en"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/fIF1myS9fyc&hl=en" type="application/x-shockwave-flash" wmode="transparent" width="425" height="355"></embed></object>

Back the fuel screw out 1/2 turn.

What jets are you running? Pilot? Needle clip position?

Posted by: Ruby Soho

50 pilot, 185 main

as you can see it doesnt sputter or anyuthing through the gears its super strong the hole way

needle position is stock i think i never checked it

Posted by: Ruby Soho

i adjusted the A/F screw alittle, what a PAIN.

i got it to stop backfiring through the carb but it still pops and backfires alittle, whats everyone else set their screw at?

Posted by: bigbryan

I just installed a 450 carb on my 400 and it run great, i recommend it to every one. what i did is i use a 2in no hub from the carb to the intake and it work great you dont have to cut the carb it fit perfect

Posted by: HondaRaceReady

Ok, I read most of this thread, and this is the only thing I don't understand. Why use a dremel or sandpaper to make the 400ex airboot bigger, why not just use a 450r airboot and make the airbox hole bigger to make it fit? You could even use a 450r air filter for more air flow.

Posted by: zrpilot

quote:
Originally posted by HondaRaceReady
Ok, I read most of this thread, and this is the only thing I don't understand. Why use a dremel or sandpaper to make the 400ex airboot bigger, why not just use a 450r airboot and make the airbox hole bigger to make it fit? You could even use a 450r air filter for more air flow.

The air boot between the engine and the carb from a 450R will not fit the 400EX head. And the air boot from a 450R would not fit into the 400EX airbox.....

To many incompatible parts!

Posted by: HondaRaceReady

quote:
The air boot between the engine and the carb from a 450R will not fit the 400EX head. And the air boot from a 450R would not fit into the 400EX airbox.....

What if you put sanded the air boot that fits between the 450r carb and 400ex head so that would fit, and you used a 450r air boot that goes from the 450r carb to the 400ex airbox? You could sand the airbox hole to make it fit.

Posted by: zrpilot

I guess, never thought of trying. Just seems nicer and easier to do it like this:

http://i94.photobucket.com/albums/l97/zrpilot/IMG_0603.jpg

Posted by: atvhonda-rider

hey zrpilot, i tried pm'ing you, i may need a 450r carb adapter, got any left? PM please. Thanks -Wes

Posted by: zrpilot

quote:
Originally posted by atvhonda-rider
hey zrpilot, i tried pm'ing you, i may need a 450r carb adapter, got any left? PM please. Thanks -Wes

Did not see your PM, sorry. Good news though, I do have a couple adapters left! Price is still $45 shipped. PM me for further details or email at

z r p i l o t @ g m a i l. c o m

Remove spaces.

Posted by: pepshocks

quote:
Originally posted by yamablaster24
My friend is selling a brand new stock 450r carb if anyone is interested.

will a 04-05 carb work from a 450r? are they fcr's

Posted by: zrpilot

quote:
Originally posted by pepshocks
will a 04-05 carb work from a 450r? are they fcr's

Yes and No

Posted by: asohagan

does anyone know of any 450 carbs for sale? i got a 460ex with a stage 3 cam and a ported head still running stock carb and exhaust. i need an exhaust system to if anyone knows of any let me know

Posted by: zrpilot

quote:
Originally posted by asohagan
does anyone know of any 450 carbs for sale? i got a 460ex with a stage 3 cam and a ported head still running stock carb and exhaust. i need an exhaust system to if anyone knows of any let me know

Go to servicehonda.com. They are $160 NEW.

Posted by: HondaRaceReady

quote:
Did not see your PM, sorry. Good news though, I do have a couple adapters left! Price is still $45 shipped. PM me for further details or email at

What are these adapters you're talking about? The tube that goes from the 450r carb to the 400ex head?

Posted by: zrpilot

quote:
Originally posted by HondaRaceReady
What are these adapters you're talking about? The tube that goes from the 450r carb to the 400ex head?

The adapter mates the 450R carb to the air box WITHOUT have to re-locate the air box... It also reduces the possibility of ruining the air boot from stretching to fit over carb... Check out my 450R carb install post

Posted by: ben_400ex

ok guys i'm trying to figure this out and i'm hoping someone here can give me a definite answer.
I got a second hand 450r carb which has nothing in the hotstart hole, no cable or cable adaptor.
can i just seal and plug the hole to make it air tight or do i need to get something else to do it properly?
cheers

Posted by: zrpilot

The ABSOLUTE BEST way to do this is to purchase item number 8 and seal off the opening with RTV after Item 8 is plugging the HOT start hole.

PS: PM answered!

Posted by: 400exrider_1230

if you use the same main jet as you used on the stock carb you're not getting as much power as you could if you use a biger main jet

400ex
swing arm skid plate
big gun slip on
k&n air filter
dg front bumper

Posted by: mor300ex

Hello Everyone, my 14 years old son has the 400ex and I've been reading about the 450 carb swap...right now his machine has the FMF PowerBomb header with a White Bros slip-on, aluminum air box and battery has been relocated...so not much for upgrades. If we are going to do this carb swap does the machine need the internal engine upgrades or will the swap work out ok as he's set right now? Thanks for the help!

Oh question on a different topic, his negative battery cable keeps frying right at the connection to the battery

Has this happened to anyone else or dos anyone have a suggestion(s) that can resolve this very annoying issue???
Many thanks to all that have advice.

Pic of my son riding Waldon Colorado Sand Dunes

Posted by: zrpilot

quote:
Originally posted by mor300ex
Hello Everyone, my 14 years old son has the 400ex and I've been reading about the 450 carb swap...right now his machine has the FMF PowerBomb header with a White Bros slip-on, aluminum air box and battery has been relocated...so not much for upgrades. If we are going to do this carb swap does the machine need the internal engine upgrades or will the swap work out ok as he's set right now? Thanks for the help!
Oh question on a different topic, his negative battery cable keeps frying right at the connection to the battery Has this happened to anyone else or dos anyone have a suggestion(s) that can resolve this very annoying issue???
Many thanks to all that have advice.

Pic of my son riding Waldon Colorado Sand Dunes

Even on a stock 400EX, you will see a nice throttle response and power improvement. Did you happen to read my 405R carb mini how-to thread?

If I were you, I would do this mod on stock machine.

Posted by: mor300ex

thank you so much for the reply and I will look for your 405R carb mini how-to thread . I'll certainl let you know if I have questions and hope they're not really stupid ones!!!

Posted by: zrpilot

quote:
Originally posted by mor300ex
thank you so much for the reply and I will look for your 405R carb mini how-to thread . I'll certainl let you know if I have questions and hope they're not really stupid ones!!!

Check your PMs

Posted by: justin1022

ok you guys!!! i have been wanting to do this mod for about a month

and i was buying crap for my 400ex of ebay the other night i baught a 440 big bore kit pb block of kit heavy duty cam chain a new harness a hmf pipe and a few little other goodies then i decided to search a 450r carb and i found one for the buy it now price of 100$$$

so i baught it it came with the hot start throttle cable and even the throttle that mounts to your handle bars and fuel hose. i was thinking about it if it was a good deal and i figured out that it was because you guys are paying about 165 for one but now the real question is what would you guys start jetting at once i drop my pipe on and 440 kit i also have hot cams stage 2 and a k&n filter i dont really no were to start

i havent even jetted a carb before the reason i baught a new one is because my old one a bunch of screws got striped and it was messed up.

Posted by: zrpilot

180 main and the needle on the 4th notch and a 50 pilot. Start there and see how it runs. It is ABSOLUTLEY critcial that the hot start be completely sealed!

Posted by: justin1022

quote:
Originally posted by zrpilot
180 main and the needle on the 4th notch and a 50 pilot. Start there and see how it runs. It is ABSOLUTLEY critcial that the hot start be completely sealed!

what if i just leave the hot start and moun it to the bars i no thre is not really a reason for it because its electric start but then it would be less of a hassle. could i just do that?

Posted by: hypersnyper6947

was this a reg 450 carb or the fcr when the first guy got the WOW effect

Posted by: asohagan

it was an fcr

Posted by: zrpilot

quote:
Originally posted by hypersnyper6947
was this a reg 450 carb or the fcr when the first guy got the WOW effect

2004-2005 450R carb, just as the title of the thread says!!!!!!

Posted by: hypersnyper6947

quote:
Originally posted by zrpilot
2004-2005 450R carb, just as the title of the thread says!!!!!!

The title doesn't say anything about year, and from what i hear there is a big difference between the 04-05 and the 06-08 FCR. Does anybody know if that difference is that significant

Thanks

Posted by: zrpilot

quote:
Originally posted by hypersnyper6947
The title doesn't say anything about year, and from what i hear there is a big difference between the 04-05 and the 06-08 FCR. Does anybody know if that difference is that significant

Thanks

Check the date of the first post... 2005!

Anyhow there is a BIG difference between those years. I know of only one guy here running the '06 and newer carb. Fitting the '06 newer carb is more difficult and the carb is more expensive.

In summary use th '04-'05 carb!

Posted by: hypersnyper6947

cool thanks, i didnt even think to look at the first post date. I think the 450 carb should be better than my lectron

Posted by: honda729

my honda dealer just told me that doin this was dumb cuz the intake boot wouldnt possibly allow anymore air through to the carb. lol dumbasses anyway great mod i recommend it to anyone

Posted by: leasureryan

here is the verdict......

I just installed a 450R carb.......it is an absofucenlutely AMAZING upgrade!

Enough said....

Posted by: FoxHondaRider

guess who's next for the 450r carb? now to decide how to hook it up. Can I use a 450r airboot and modify it to fit the 400ex air box or what?

Posted by: sc400ex_rider

no just enlarge the stock one with a sanding flapper wheel. you need to do the intake to. also for fuel line just use 3/8 auto fuel line. put a sparkplug in one end to enlarge it to fit the very large 450r inlet. its a little big to the petcock but i used a hose clamp with no probs. you need to move the airbox up about 1/2" also.

Posted by: FoxHondaRider

if the airbox is moved up a 1/2" then do I make a steel bracket so it stills connects to the back or what?

Posted by: sc400ex_rider

some people say to take the rear bolt out push it up(forward) then put the bolt back in with a big washer to hold it. i tried this but it came loose. so i got one of those small torches and melted the plastic rear airbox bracket a little and bent it back. then i melted the tab a little to make the tab flat again and it works great. you can barley tell its modded.