sputtering

[fastboarder]

took my 250 out for a little today and i let it warm up for a couple minutes and then i went to ride it and it wouldnt clear out in first through third gear then in fourth it was fine what could cause this main jet or pilot jet

[Aceman]

It sounds like your crankcase loaded up with fuel while you were warming it up. Make sure you blip the throttle a little while it's warming up. Tuning guide:

http://www.duncanracing.com/techfaq/Tech_keihin-carburetion-jetting.phtml

[fastboarder]

i do that and it still sputters the whole time i ride except 4 through 6 gear

[1promodfan]

Originally posted by fastboarder
i do that and it still sputters the whole time i ride except 4 through 6 gear

Have you changed anything? Mine was doing the same thing after my rebuild. I had a nightmare, but after playing with it I finally got it right. Turns out I had to change all the settings in my carb. I believe the main thing was my needle. I'm pretty much at sea level and I have a 42 pilot, DGK needle 2nd clip from the top, and a 170 main.....36mm PWK keihin.

I would check your clip and maybe move it up or down.

[86 Quad R]

after warm up and running through the gears it clears up. right? or does it continue to have that same issue after it sets a few and the process has to be repeated?

[fastboarder]

when it warms up it will clear up in 3 sometimes second but hardly ever in first

[86 Quad R]

but do you have to repeat the process of having to run it through the gears to clear it out after its good and warm, after its set a few minutes?

[fastboarder]

yes

[86 Quad R]

try going through the carb again and making doubley sure that the float is set correctly and that the float needle is shutting the fuel off and giving that a whirl. then try en fine tune the jetting. :cool:

[fastboarder]

alright ill try that