somebody help please!!!!!!!!!!!!

[diesel423]

ok so my yfz aint moved all winter and race season starts in two weeks and my issue is that the thing will start fine,idle fine,and top end is fine but quarter to a little over half throttle is spittin and sputterin like crazy but if i hit the throttle wide open it runs like a bat out of hell. Ive checked all the jets nothing pluggin them i put a procom on it and thought it was the prob so i switched it back to stock and it did the same im getting so frustrated im ready to use dynamite any input would be helpful...

my setup is cam mod drd slip on ehs airbox lid k&n filter my jetting is 160 main, 45 pilot, fuel screw 2 out.

I'm not really an expert but was the fuel sitting in it all winter?... It wasn't doing it before it was parked, correct?

[diesel423]

i added new gas and the gas i had in it i put sta-bil...

Thats the only thing I know of....? But im not a mechanic. Sorry

[Ryan]

Well one thing, it sounds let your running a bit lean on the main jet... I would go up a size or 2 and see what happens. Also check your Needle, try to richen it up and see if that fixes the problem.