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jeting for 450R carb on 400ex
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Posted by: r-exrider0003
yea i read that about 3 times, and still dont totally understand how you did it.
Posted by: zrpilot
quote:
Originally posted by r-exrider0003
yea i read that about 3 times, and still dont totally understand how you did it.
I took the black plastic cover that holds the spring and plunger in plcae and filled it full of RTV, then I allowed it to dry for a couple of days and then re-installed it with the spring and plunger in place.
Posted by: Wheelie
My final jetting:
48 pilot--A/F screw out 2 1/4 turns, needle on 4th clip from top, and a 200k main. Works great from sea level to 2000ft.
Mods are in my sig.
Tried the 50 pilot, throttle response suffered. Throttle response with the 48 pilot is incredible.
Posted by: zrpilot
quote:
Originally posted by Wheelie
My final jetting:
48 pilot--A/F screw out 2 1/4 turns, needle on 4th clip from top, and a 200k main. Works great from sea level to 2000ft.
Mods are in my sig.
Tried the 50 pilot, throttle response suffered. Throttle response with the 48 pilot is incredible.
Thanks for sharing!
Nice Job!!!
Posted by: r-exrider0003
alright, ive got it mostly dialed in, itll run somewhat now. i found out that it didnt have a pilot jet at all, that explains why i couldnt find it hah. any ways now i have a 170 main in, a 50 pilot, fuel/air at 2.5 out, stock needle at middle positon. and i havent got the hotstart sealed bc my brother said he doesnt have his sealed on his 450 and it doesnt matter, and im not really sure how- i know youve explained it, but idk all the names of the carb piece's and i dont have a cable to hook up. did you get that black plastic type thing from like a hardware store, or is it what the factory hot start looks like? but running wise, it will idle kinda, but it holds rev's and sometime idles up on its own. choppy, and backfires a little... this is all in neutral, bc i have yet to actually ride it yet. thanks again .
Posted by: zrpilot
quote:
Originally posted by r-exrider0003
alright, ive got it mostly dialed in, itll run somewhat now. i found out that it didnt have a pilot jet at all, that explains why i couldnt find it hah. any ways now i have a 170 main in, a 50 pilot, fuel/air at 2.5 out, stock needle at middle positon. and i havent got the hotstart sealed bc my brother said he doesnt have his sealed on his 450 and it doesnt matter, and im not really sure how- i know youve explained it, but idk all the names of the carb piece's and i dont have a cable to hook up. did you get that black plastic type thing from like a hardware store, or is it what the factory hot start looks like? but running wise, it will idle kinda, but it holds rev's and sometime idles up on its own. choppy, and backfires a little... this is all in neutral, bc i have yet to actually ride it yet. thanks again .
The hot start is in an important device. Inside there is a plunger with a spring. The black cover that I depict in my picture is not the important part, the spring and plunger are!!! If yours has the spring and plunger held in place by another means, thats OK. But its gotta be there!
Zrpilot
Posted by: r-exrider0003
so i finally got my hotstart in. man, im sorry forall the confusion. i now realize how important this is. and turns out my brother had the plunger only in his, and didnt notice nothing sticking out and thought it was empty. anyways, this thing is running off, but man the difference is amazing. its gotta lot more torque and pep, well this is also now running a ported head so that helps too hah. anyways im running a 170 main jet, a 48 pilot, needle on one up from the middle(towards the lean side) and my air fuel screw is about 1.75 out. to get it to start, i need to pump the throttle a bit, then choke on, but itll idle well once primed. its gotta lot of giddy up from about 1/5th to 3/5th then it kinda flat line's and sounds alot like im hitting the rev limmiter (a gargoling type noise), i had a 185 main, and it ran worse with more rev limiter sounds thruout the throttle. so i was wondering what you think i should do, what size main jet? it seems like it needs to be leand out a bit, but sounds kinda crazy when i see some guys on here running 210 mains.? 
btw im at low elevation, around 500-1000 id say, and its somewhat cold out. thanks zrpilot, sorry for all the trouble.
Posted by: zrpilot
quote:
Originally posted by r-exrider0003
so i finally got my hotstart in. man, im sorry forall the confusion. i now realize how important this is. and turns out my brother had the plunger only in his, and didnt notice nothing sticking out and thought it was empty. anyways, this thing is running off, but man the difference is amazing. its gotta lot more torque and pep, well this is also now running a ported head so that helps too hah. anyways im running a 170 main jet, a 48 pilot, needle on one up from the middle(towards the lean side) and my air fuel screw is about 1.75 out. to get it to start, i need to pump the throttle a bit, then choke on, but itll idle well once primed. its gotta lot of giddy up from about 1/5th to 3/5th then it kinda flat line's and sounds alot like im hitting the rev limmiter (a gargoling type noise), i had a 185 main, and it ran worse with more rev limiter sounds thruout the throttle. so i was wondering what you think i should do, what size main jet? it seems like it needs to be leand out a bit, but sounds kinda crazy when i see some guys on here running 210 mains.? btw im at low elevation, around 500-1000 id say, and its somewhat cold out. thanks zrpilot, sorry for all the trouble.
Before we change the main, I'd lower the clip on the needle. (in other words, raise the needle!). Try the 4th notch from the top.
Posted by: r-exrider0003
wouldnt this richen it? the oppisite of what i thought it needed? you refer to the top of the needle as the bolder end correct? ill try it tomorow after schoool, and report back with results.
Posted by: REDRIDER312
Just installed my 450r carb....now i need help jetting......Mods are a yoshi slip-on,rev box, open aluminum air box w/ foam filter
Where should i go with the jetting ??
ANY INPUT WOULD BE GREAT !!!!!
Posted by: 400exmatt
i have a 400 that is bored to a 440 11.1 , lrd pro series, aluminum airbox, uni filter, I got a 450r carb on the way and was wondering where would be a good place to start at.. thanks.
Posted by: phat1478
i have a 406 with 11:1, ported, stage 2 hotcam, e series slip on, k&n, and a rev box. ready to install 450 carb what jets should i run?
Posted by: 400exmatt
Can anyone help me find a part # for the hotstart spring and plunger. i really need this. thanks
Posted by: zrpilot
quote:
Originally posted by 400exmatt
Can anyone help me find a part # for the hotstart spring and plunger. i really need this. thanks
I think this is the part number.
16019-HP1-671 VALVE SET $21.51
Posted by: BIGKURT666
ive got a 450r carb and cable for 75 bucks no less pm me if interested
Posted by: bob gnarl
First and foremost i want to say thanks 2 everyone 4 posting all the hot tips! i just got my carb dialed in! I have CT Racing 416: ported&polished, stage2 cam, ct full race exhaust and wiseco 11:1 piston, running 60/40 mix. The setup im running on this carb is a 195 main,air/fuel screw out 3 1/2 to 4 turns out. ( I fiddled with it quite a bit) so i cant remember exactly and i set the needle second up from the bottom( richer end) but like i said i had to think of my fuel situation as well! I might end up bumping up 1 more jet 4 sh*ts and giggles!
Posted by: exrid3r400
im rebuilding my 440ex it has yoshimura exhaust kibblewhite vavle wit kibblewhite springs hotcams stage 2 im puttin on the 450r carb idk what i should run for jets my elavation is 1000ft
Posted by: 1965 honda
i just bought a 450 carb off ebay all the jets were gone. so im not sure were the the pilot jet gos or im just missunderstanding what to do
Posted by: zrpilot
quote:
Originally posted by 1965 honda
i just bought a 450 carb off ebay all the jets were gone. so im not sure were the the pilot jet gos or im just missunderstanding what to do
OK lets start by seeing if there is a needle jet? Should be a thin brass color "needle" in the middle of the carb slide. Note you may have to move the slide up to see it.
Next, I take it you have pulled the float bowl off? The main should be directly inline with the needle. The pilot should be right next to the main and is brass colored with a straight slot in it for a screw driver to fit into.
Post some pictures if you can..
Posted by: 1965 honda
ok i had no needle jet or main jet i have a pilot jet assuming stock.
i bought a dyno jet kit and installed the needle jet they supply, im not sure if its bigger than the stock needle but i have it on the very top notch (leanest)the main is a 112, pilot screw out 1.5 turns
and im still puffin black smoke. my sparkplug is black and i just cant get it to stop puffin. im not sure what the problem is but its driving me nuts because im seeing that everyone else is running a much larger main jet, needle in the middle and larger pilot or at least opened up more. please help
Posted by: zrpilot
quote:
Originally posted by 1965 honda
ok i had no needle jet or main jet i have a pilot jet assuming stock.
i bought a dyno jet kit and installed the needle jet they supply, im not sure if its bigger than the stock needle but i have it on the very top notch (leanest)the main is a 112, pilot screw out 1.5 turns
and im still puffin black smoke. my sparkplug is black and i just cant get it to stop puffin. im not sure what the problem is but its driving me nuts because im seeing that everyone else is running a much larger main jet, needle in the middle and larger pilot or at least opened up more. please help
Is the carb a round or flat slide? Is the hot start plugged correctly?
I'm not really familar with dynojet main sizing, but if you were running the stock Keihen jets I would recommend around a 170 main, needle on the 4th from the top, and a 50 pilot.
Really look at the hot start... this could be the problem!
Zrpilot.
Posted by: 1965 honda
the carb i bought was junk ive already replaced it with stock. im just gonna buy a new one from the dealer. I WILL NEVER BUY FROM EBAY AGAIN!!!!!!! or at least another carb anyway.
Posted by: zrpilot
quote:
Originally posted by 1965 honda
the carb i bought was junk ive already replaced it with stock. im just gonna buy a new one from the dealer. I WILL NEVER BUY FROM EBAY AGAIN!!!!!!! or at least another carb anyway.
brand new from servicehonda.com they are like $170!!!!
Not a better deal to be had IMO!!!!
Don't give up the 450R carb is an inexpensive upgrade!
Posted by: HondaRaceReady
It seems like everyone with this upgrade says it will stall if you rev it in neutral. Will it stall if you try to putt around in first? I know the top end power is great, but without low end, the bike will seem weaker.
Posted by: zrpilot
quote:
Originally posted by HondaRaceReady
It seems like everyone with this upgrade says it will stall if you rev it in neutral. Will it stall if you try to putt around in first? I know the top end power is great, but without low end, the bike will seem weaker.
Mine does not do this!!!!
Most people say this is a GREAT upgrade!!!! I think if you did it to your 400EX, you would agree!
Posted by: Ruby Soho
mine doesnt stall
it pulls like no tommorow low rpm's
Posted by: BigBore24
if it stalls then its not jetted right. i just put my 12.5:1 piston back in and it started stalling like you are talking about. i lowered the clip on the needle to the 4th notch from the top and it took care of it. the carb should give you the same feel all the way throgh the throttle like the stock carb...only a lot better
Posted by: alex10
What is the part num. to buy one from service honda?
Posted by: zrpilot
quote:
Originally posted by alex10
What is the part num. to buy one from service honda?
Part number is 16100-HP1-673 They are $159 new from Service honda . com
Look at my how-to on my 450R installation
my 450R carb installation
Posted by: honda729
got my 450r carb now i need some jetting advice, 416 12.5:1, stage 2 hotcam, powerbomb header,uni filter, cobra slip on soon to be a hmf, im at about 800-1000 ft. thanks again
Posted by: zrpilot
quote:
Originally posted by honda729
got my 450r carb now i need some jetting advice, 416 12.5:1, stage 2 hotcam, powerbomb header,uni filter, cobra slip on soon to be a hmf, im at about 800-1000 ft. thanks again
Start at a 180 main, needle on the 4th notch and a 50-52 pilot
EDIT: OOPS....
Posted by: bens250ex
what brand jet has a R by the number?
Posted by: leasureryan
lol....ZRPilot...you said 150 pilot......lol
okay...couple questions.
1. Do I need a 450R cable when installing the carb?
2. Can I install a hot start cable on my quad instead of blocking it off? Or is it worth it?
3. I am currently running a 172 main, 52 pilot....needle on 4th clip down, screw out 3 turns...quad couldn't run better. When installing the R carb...should I stick with the same size jets as current, or go bigger. I mean, the way I understand it is, more air = More fuel, so I should atleast go up a couple jet sizes, but maybe I am wrong. I mean...I can jet a bike pretty good, I even bring some home from work to do, since EPA won't allow them to pipe or jet there...lol. Just wondering what the transition will be? If worst comes to worst, I will just have it apart a couple 10 or 20 times....lol. That will most likely be how it goes down anyways...lol
I am a freak about my jetting....I can't just change it once, and ride around on it like that all day...I have to keep screwing with it until it is perfect. Sometimes it happens quickly, sometimes it doesn't....lol But I can't allow my quad to run like butt, with hesitations, and backfiring etc.
Posted by: zrpilot
quote:
Originally posted by leasureryan
lol....ZRPilot...you said 150 pilot......lol
okay...couple questions.
1. Do I need a 450R cable when installing the carb?
2. Can I install a hot start cable on my quad instead of blocking it off? Or is it worth it?
3. I am currently running a 172 main, 52 pilot....needle on 4th clip down, screw out 3 turns...quad couldn't run better. When installing the R carb...should I stick with the same size jets as current, or go bigger. I mean, the way I understand it is, more air = More fuel, so I should atleast go up a couple jet sizes, but maybe I am wrong. I mean...I can jet a bike pretty good, I even bring some home from work to do, since EPA won't allow them to pipe or jet there...lol. Just wondering what the transition will be? If worst comes to worst, I will just have it apart a couple 10 or 20 times....lol. That will most likely be how it goes down anyways...lol
I am a freak about my jetting....I can't just change it once, and ride around on it like that all day...I have to keep screwing with it until it is perfect. Sometimes it happens quickly, sometimes it doesn't....lol But I can't allow my quad to run like butt, with hesitations, and backfiring etc.
answers:
1) yes
2)not needed, I'd block off
3)I'd try that jetting, should be close
Posted by: leasureryan
I got the adapter I bought from you...great job! I still don't have the carb until later this week though....lol. ZRpilot is faster than Honda Direct!...lol
Question is....I like to try and keep things fairly intact, and try not to get to "race" with things....like removing the choke plate on my current carb for example. I never have to use it, but do ride in the winter, and may have to use it then, which is why I left it on.
Are most of you guys taking the choke out of the 450R carb, or leaving them in? If I do remove it...promise me I will never have problems getting it started...lol! If you think I will...I will leave it on.
Anyone ever use those air direction "Turbo" insert things that fit between the carb and boot(motor side)??? Do they work, or help at all?
Posted by: zrpilot
quote:
Originally posted by leasureryan
I got the adapter I bought from you...great job! I still don't have the carb until later this week though....lol. ZRpilot is faster than Honda Direct!...lol
Question is....I like to try and keep things fairly intact, and try not to get to "race" with things....like removing the choke plate on my current carb for example. I never have to use it, but do ride in the winter, and may have to use it then, which is why I left it on.
Are most of you guys taking the choke out of the 450R carb, or leaving them in? If I do remove it...promise me I will never have problems getting it started...lol! If you think I will...I will leave it on.
Anyone ever use those air direction "Turbo" insert things that fit between the carb and boot(motor side)??? Do they work, or help at all?
Ryan,
Thanks for the compliment!
The 450R carb does not have a tradition choke butterfly like the stock carb does. Instead it has an enrichment circuit that simply provides additional fuel for cold starts. When you put the 450R carb on, you will see a yellow plastic handle that , unfortunately, will not work. However you can fab up your own to pull up on the enrichment circuit plunger, similar to the yellow handle. I did not need that. I simply stabbed the throttle a couple of times and then lit it off. Sometimes I had to do the same will cranking, but it always started.
Hope this helps!
Posted by: leasureryan
hell yeah. Thats cool. On the parts fiche ....it showed the yellow lever....so I assumed it has a butterfly type choke. What is the lever for then? And will I have to trim it since I have your adapter?
Posted by: zrpilot
quote:
Originally posted by leasureryan
hell yeah. Thats cool. On the parts fiche ....it showed the yellow lever....so I assumed it has a butterfly type choke. What is the lever for then? And will I have to trim it since I have your adapter?
trimming could work....
I did not use it at all because I primarily ride when the weather is not Nipple hardening...LOL
I eventually did fashion a suitable replacement from some welding wire so that I could aid the motor in starting as the weather got colder
Posted by: 08trx400ex
just got my 05 450r carb in the mail. where can i get a throttle cable? What is the stock jetting on this carb so I will know which direction to go? What are the 2 electrical wires coming out of this carb for? My 400ex carb did not have these and are they necessary?
Posted by: zrpilot
quote:
Originally posted by 08trx400ex
just got my 05 450r carb in the mail. where can i get a throttle cable? What is the stock jetting on this carb so I will know which direction to go? What are the 2 electrical wires coming out of this carb for? My 400ex carb did not have these and are they necessary?
USe a 450R throttle cable
Main is a 148 and the pilot is 48...??? IIRC
Throttle position, cut them
Posted by: 08trx400ex
installed carb and awesome! need to rejet but no big deal. mr. zr, can i please get one of those adapters? think my original carb had a problem with the float or something.
Posted by: zrpilot
quote:
Originally posted by 08trx400ex
installed carb and awesome! need to rejet but no big deal. mr. zr, can i please get one of those adapters? think my original carb had a problem with the float or something.
PM sent
Posted by: leasureryan
okay....was everyones jetting lower than with the 400ex carb? I put in the exact same jets as what was in the 400 carb....seems really rich....got flames from the exhaust, poping back into the carb. Should I go back down in jets?
Posted by: zrpilot
quote:
Originally posted by leasureryan
okay....was everyones jetting lower than with the 400ex carb? I put in the exact same jets as what was in the 400 carb....seems really rich....got flames from the exhaust, poping back into the carb. Should I go back down in jets?
What jets do you have in it now? Needle position? Pilot?
Posted by: leasureryan
started with a 168 main....just like what is in the 400 carb.....then starte with a 45 pilot....same as 400 carb....ran like complete ***....lots of strong black fumes....long hot flames coming from pipe.........pulled the plug,,,,and it was imediately black. I droped the pilot down to a 42...and the main down to a 158....air screw 3 out needle 3rd clip.....bike idles fine....still has a heavy chug/cough in it though...and still shooting flames, poping back into the carb....the only thing I could compare it to in sound in one of the old john deer engines they use to make taffy...I think it's steam maybe...where they will turn over and turn over then "POP"....you here the little motor fire, or release pressure, or whatever they do...lol....that is the only thing I can compare it to...lol
I still think it's pretty rich. I don't understand why on a 450...they only have a 118 main....you would think that being a bigger motor, moving more air....that it would use way more fuel. I can jet pretty well.....but if it is truely that rich...I am baffled
Posted by: FoxHondaRider
i have yet to figure that out aswell. Bigger engine, bigger carb with more airflow and smaller jets?
Posted by: zrpilot
quote:
Originally posted by leasureryan
started with a 168 main....just like what is in the 400 carb.....then starte with a 45 pilot....same as 400 carb....ran like complete ***....lots of strong black fumes....long hot flames coming from pipe.........pulled the plug,,,,and it was imediately black. I droped the pilot down to a 42...and the main down to a 158....air screw 3 out needle 3rd clip.....bike idles fine....still has a heavy chug/cough in it though...and still shooting flames, poping back into the carb....the only thing I could compare it to in sound in one of the old john deer engines they use to make taffy...I think it's steam maybe...where they will turn over and turn over then "POP"....you here the little motor fire, or release pressure, or whatever they do...lol....that is the only thing I can compare it to...lol
I still think it's pretty rich. I don't understand why on a 450...they only have a 118 main....you would think that being a bigger motor, moving more air....that it would use way more fuel. I can jet pretty well.....but if it is truely that rich...I am baffled
Could it be that you are too lean? Try a 175 main, needle on the 4th notch and a 50 pilot... then adjust the fuel screw.
Posted by: leasureryan
I went to replace my header gaskets this morning....broke a stud....spent 3 hours getting that out....luckily I work at a Honda dealer....so I can make my way right into the service dept. and toss it on a lift, so having the tools and supplies makes things so much easier...lol. BUT....when I pulled the pipe....it was super white inside. So I knew instantly that it was way lean.....got the studs in, and went home and tossed the bigger jets in. I started with a 180 main and a 48 pilot.......flames went away...as did all the poping....actually runs really good, but need alot more fine tuning. Has a hard stumble, and may still be a little lean
the one thing that is absolutely amazing is.......FINALLY, it CURED my decel backfire that I could NOT get tuned out of that 400 carb with this HMF full system. I tried EVERY jetting combo possible, and EVERY clip and screw setting...it just wasn't happening. Those pipes I think are made to move alot more air than a stocker can.
Anyways...I am back off to the garage to toss a bigger jet in it and see how it acts. Currently at a 180 main and 48 pilot....going to toss in a 185 and or 190...and maybe a 50 pilot.
Any comments or suggestions?
Posted by: FoxHondaRider
so it runs a lot stronger even just with exahust and intake mods? I've been debating this mod for awhile, everytime I take a few weeks off from riding I end up being bored from not riding and I have the urge to get my hands dirty with something so I tend to buy parts lol. I love working on my quad when its something to better it, i dont like replacing parts and stuff if they get damaged but just the radio on, fan on, rolling stool, a lot of soda, working on something... i love it.
Posted by: leasureryan
I love it too.....the wife however has a differant theory!...lol
anyway....I hadn't even riden it yet....I just tossed the 190 main in it.....seemed to be running even better than the 180...so I knew it was still a little lean with the 180. Put the 190 in and,No hesitations, no bogging, no poping or backfire.....so I tossed the rear fender on, and straped the tank down....and went for a spin. I was just going to go up the dike and back.......but couldn't resist going the distance, 100 yards further into the trails......so off I went. All I can say is HOLY SHART! The instant throttle responce, so much more low end...it just keeps giving and giving. I can only imagine what it will provide once I get my other top end straped on!
we will see how this one reacts....it may still be a little lean....but it's damn close. All will be told next Wednesday when I head down to Mt Gilead to get it Dynoed. I want this thing running the perfect most powerful fuel mixture. Thats where the little exhaust sniffer comes into handy!
Thanks for all the help guys!
Posted by: leasureryan
Oh yeah....I also don't suggest anyone ride a 400 without one!.....lol
Posted by: leasureryan
got dyno'd today.....seems the 190 was just a littlemuch for it...lost power up top. Bottom was jetted perfect. We jumped down to a 185 main....got better scores.....but tossed a 180 in, and gained 2.5 more horsepower than with the 190...and it pulled clear through with the 180. PERFECT!!! Gotta love the sniffer!
Posted by: zrpilot
quote:
Originally posted by leasureryan
got dyno'd today.....seems the 190 was just a littlemuch for it...lost power up top. Bottom was jetted perfect. We jumped down to a 185 main....got better scores.....but tossed a 180 in, and gained 2.5 more horsepower than with the 190...and it pulled clear through with the 180. PERFECT!!! Gotta love the sniffer!
Dude,
Your killing me.... WHAT HP ##s DID IT PULL?????
PS: I was REALLY close with my original recommendations on jetting, wasn't I
????
LOL
Posted by: leasureryan
How am I killing you? Is that a good thing or a bad thing?...lol
you were damn close brother....damn close!
190 main.....1st pull 31.18 rwhp
180 main.... 3rd pull 33.82 rwhp
nothing jaw droping....but hell....it's still a stock motor
Jetting is SOOOOOO important!
Posted by: redzoomer
quote:
Originally posted by leasureryan
it's still a stock motor
Jetting is SOOOOOO important!
You're running a 180 with a 450 carb on a stock motor? I was running a 170 in mine and it felt like it was falling on it's face! Hmmmm...
Posted by: zrpilot
quote:
Originally posted by redzoomer
You're running a 180 with a 450 carb on a stock motor? I was running a 170 in mine and it felt like it was falling on it's face! Hmmmm...
Here is some food for thought as I have wondered the same thing:
A larger carb will have less vacuum signal and require a larger jet to meter the same air fuel ratio.
Posted by: leasureryan
quote:
Originally posted by redzoomer
You're running a 180 with a 450 carb on a stock motor? I was running a 170 in mine and it felt like it was falling on it's face! Hmmmm...
I started with a 168....and there was no way in hell it was going to work. It was so lean it would barely run. Tossed the 190 in it, threw it on the dyno, and worked our way down until we found the most power. I live in central Ohio...jetting must be way differant here. I can't help it that this quad accepts that much fuel.
hell....I was using a 168 in my 400ex carb. I was told to start near the same jetting....but that wasn't cutting it with the 450R carb.
Posted by: hypersnyper6947
I gave up on trying to jet it myself, its going on the dyno tomorrow to be professionally jetted, i will let you guys know how it goes.
ZR thanks for the help before. I just want it running perfect now, i have been waiting sooo long to finally have it running great and woop up on my buddies on there 660's
Posted by: zrpilot
quote:
Originally posted by hypersnyper6947
ZR thanks for the help before. I just want it running perfect now, i have been waiting sooo long to finally have it running great and woop up on my buddies on there 660's
You are welcome, glad to help.
Jetting on a dyno is a great way to get the jetting dialed in! Let us know the results.
OH BTW!!! VERY IMPORTANT detail. Bring a USB memory stick, floppy, or CDR disk when you go to the dyno. Ask them to put the native WinPEP files from your runs on the memory storage device. You can then download a trial version of the software and evaluate the runs however you please!!!
Keep us posted!
Posted by: hypersnyper6947
ok so i got my numbers, i have to get my chart scanned so i can post it but my ex made 32.65 hp @ 6650 RPM and 30.82 Torque at 4771 RPM. I thought that was kinda of low for HP but the torque seems good. The guy said he just had a grizzly 660 in there on the dyno (2wd) and mine made around the same hp so...
Posted by: hypersnyper6947
So i have a 165 main 50 pilot and the fuel screw is all the way out almost. The guy who jetted it said it falls off at the top end, but if he put a bigger main it would loose mid range power, but gain at the top. My max Hp hits at 4771 rpm, which is low. When i nail it in like 3rd it starts to stutter mid way through. If i slowly get through the throttle all the way to WOT then it does not stutter. I told him this and he said he would try to fix, free of charge of coarse. He said he thinks that it has an aftermarket needle in it, which flows more. So if i put the stock needle back in and then put a bigger main it should get rid of the mid range loss but still give me more fuel up top to stop the stuttering and give me the rest of my power.
What do you guys think?
Oh yea and it smokes a bit when i let off the throttle, whats with that?
Posted by: leasureryan
so raise your main and drop the needle......wouldn't that make sense?
Posted by: hypersnyper6947
Thats what im saying
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