2001 yamaha warrior

[ern]

im so happy with my grizzly and how it proforms that i got myself a second yamaha, a 2001 warrior 350. it starts and idles perfect has really good respose when you stab the throttle. but here is the deal with it tho. the higher the revs(top end speed) it breaks up alot. the guy before me put a white brothers exhaust pipe, but did not rejet it. so i took the carb apart(just took out the needle) and the stock needle has a lil c-clip. i was able to move it to the lowest setting to rich it up a bit. when on a test drive and same thing. i dont know what else to to from here. he said this started to happen after he installed the pipe. he said if i would put the stock pipe on it would go away. but i dont have a stock pipe.
any help please

[TRX450R_Racer]

You need a bigger main jet. I would contact the manufacturer of the pipe and they will give you a recommended jet size to put in there.

[Chevy1500z71]

the needle works as a valve, controlling how much fuel from the main jet is getting by before full throttle, this is your midrange setting. at wide open throttle, no mater were the needle clip is at, the whole needle is completely clear of the main jet and the fuel is flowing completely from the main jet, nothing stopping it so the main jet size is were your wide open throttle adjustment is.  the way the bike is breaking up is becasue it is lean, you need a bigger main jet. so for example, if it acted lean at about half throttle, then you would move the needle up one clip, rich, you would move it down. understand how it works. in your case, if you dont understand how to jet a carb its no big deal, i can pretty much tell you right now that you just need to go up about 10 points on the main jet, if 10 is to much, go down to 5 points bigger. jetting is something you just have to get a feel for.

sorry for the long post, but you should understand what you are doing, and not just put a bigger main in becasue we told you so.

[ern]

the needle works as a valve, controlling how much fuel from the main jet is getting by before full throttle, this is your midrange setting. at wide open throttle, no mater were the needle clip is at, the whole needle is completely clear of the main jet and the fuel is flowing completely from the main jet, nothing stopping it so the main jet size is were your wide open throttle adjustment is.  the way the bike is breaking up is becasue it is lean, you need a bigger main jet. so for example, if it acted lean at about half throttle, then you would move the needle up one clip, rich, you would move it down. understand how it works. in your case, if you dont understand how to jet a carb its no big deal, i can pretty much tell you right now that you just need to go up about 10 points on the main jet, if 10 is to much, go down to 5 points bigger. jetting is something you just have to get a feel for.

sorry for the long post, but you should understand what you are doing, and not just put a bigger main in becasue we told you so.

thank you very much. i did the clip adjustment with what i though i knew about jetting a quad. i snorkeled a honda foreman once, and i was told to do this mod of moving the clip down and shaving the top off a lil to get the inrichment i needed on the bike.
my friend has found his stock pipe. and he is going to give it to me. cause i cant buy a 59 dollar jet kit. the stock one thats on there now is a 130. if any1 has a 140 let me know

[Chevy1500z71]

the needle works as a valve, controlling how much fuel from the main jet is getting by before full throttle, this is your midrange setting. at wide open throttle, no mater were the needle clip is at, the whole needle is completely clear of the main jet and the fuel is flowing completely from the main jet, nothing stopping it so the main jet size is were your wide open throttle adjustment is.  the way the bike is breaking up is becasue it is lean, you need a bigger main jet. so for example, if it acted lean at about half throttle, then you would move the needle up one clip, rich, you would move it down. understand how it works. in your case, if you dont understand how to jet a carb its no big deal, i can pretty much tell you right now that you just need to go up about 10 points on the main jet, if 10 is to much, go down to 5 points bigger. jetting is something you just have to get a feel for.

sorry for the long post, but you should understand what you are doing, and not just put a bigger main in becasue we told you so.

thank you very much. i did the clip adjustment with what i though i knew about jetting a quad. i snorkeled a honda foreman once, and i was told to do this mod of moving the clip down and shaving the top off a lil to get the inrichment i needed on the bike.
my friend has found his stock pipe. and he is going to give it to me. cause i cant buy a 59 dollar jet kit. the stock one thats on there now is a 130. if any1 has a 140 let me know

stop right there! dont put the stock pipe on. you can go to any local motorcycle shop and pick up a 140 main jet for 5$. you dont need the kit, the kit is for dummies, its actually just nice to have the kit, but not necessary at all.

the advantage of the kit is that it comes with several jets so if you have somewhat of a built motor(cams, porting, bore kit, ect), you can play around with jeting, and alot of bikes come with a non adjustable needle so the kit offers a new needle with adjustment. you don't need anything more than a 5$ main jet.

[Chevy1500z71]

o yea, and im sure i have a 140 main jet i could give you if you really needed it anyway.

just look for a local atv dealer.

[TRX450R_Racer]

If the local shop can't help you www.denniskirk.com sells jets for $2.99 each.

[Chevy1500z71]

putting a stock pipe on instead of rejeting!... what would you do without the help of a forum lol

[ern]

thanks for all the replies guys. i took apart my carb again just to make sure what stock jet was in ther. and it wasnt a 130 it was a 145. thank god i double checked my self. and i went out to get a single jet. i found a place southwest cycles that sold them. he didn't have a 155 but a 152.5 and the next biggest thing was 167. so i took my chances and bought the 152.5. the bike revs up alot more now. but under the most load 5-6 gear full throttle it still breaks up. should i go and buy the 167. guy sells the jets 4.80 with tax and everything

[TRX450R_Racer]

The 167 might be too big. If they let you try it and return it I would try it.

[kawasakimojaverider]

what kinda filter are you using?

[ern]

what kinda filter are you using?

BIG K&N filter with the air box lid drilled out holes...

[Chevy1500z71]

what kinda filter are you using?

BIG K&N filter with the air box lid drilled out holes...

167 just might do it. im sure they will let you return the jet and buy another, in fact, i don't think iv ever bought a jet from my local shop that doesn't look like its been bought, used, and returned 100 times lol

go ahead and put the 167 in and see if it still breaks up, if it does, than you have another problem on your hands. 167 really should be pretty rich, but you should try it out just to confirm that the jetting is not whats makign your bike break up, because to me, a 152.5 sound like plenty, it shoudlnt be breaking up.

get the 167 and tell us how it goes.

[ern]

what kinda filter are you using?

BIG K&N filter with the air box lid drilled out holes...

167 just might do it. im sure they will let you return the jet and buy another, in fact, i don't think iv ever bought a jet from my local shop that doesn't look like its been bought, used, and returned 100 times lol

go ahead and put the 167 in and see if it still breaks up, if it does, than you have another problem on your hands. 167 really should be pretty rich, but you should try it out just to confirm that the jetting is not whats makign your bike break up, because to me, a 152.5 sound like plenty, it shoudlnt be breaking up.

get the 167 and tell us how it goes.

Will do Dr.