250x jetting

[riderssb250x]

Hey guys a had i friend of mine jet my 91 250x and he put a 150 main jet does anyone know if this is right because its running funny at times the mods i have are uni air filter, and a fmf powercore 4 full exhaust thats pretty much it for the engins do you guys think this jetting is right?

[beaubs]

try a 130, but you need to know how to read a plug... black is rich brown in perfect white is shut if of our you will blow.

[riderssb250x]

well it seems to run ok just at idle if i hit the throttle hard it bogs a lil firdst then catches

[riderssb250x]

well it seems to run ok just at idle if i hit the throttle hard it bogs a lil firdst then catches

[riderssb250x]

well it seems to run ok just at idle if i hit the throttle hard it bogs a lil firdst then catches:confused:

[bwamos]

As in previous post. 150 is way too rich.

If you're running no airbox lid or a vented airbox lid you want a 132 main jet as a starting point. (you may end up with 135 or 130).

You're needle probably needs to be raised 1 notch, also. (drop circlip down 1 spot to raise the needle)

The problem you are describing right now is a lean needle.