tuning question (hey I searched first!!!)


0-1/4 throttle sputters and dies

to me it sounds like not enough gas

but it could be to much

have paj at 2 1/2, 45 pilot stock needle setting stock main jet wb 8 discs stock header. running at 1000 alt.

I love this site!!!!


Check your plug, if looks at all too dark change it. Then come in on your fuel screw 1/4 turn at a time till the sputter is gone.

Mr T

I took the bike for a ride with a new plug and never went over 1/3 throttle when I pulled the plug it was black around the threads and whitish just on the tip of the bend that the electrode sparks to. so what next?

Check the acc. pump and clean it, if this doesn't work change the needle pos (i would start by lifting the needle 1 clip...

Keep testing and testing and testing

Good luck


'99 WR400 F, YZ exhaust, throttle stop trimmed, WR timing, airbox cover removed

Try 2 - 2 1/4 turns out. What year is your bike? Stock needle number and clip position currently?

2001 with stock needle and position

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