I have a 1992 250X with a fmf powercore IV2 and a k&n air filter. What jet kit should i get or what jets and sizes to get. And also how much do the jets help? a little or alot......... THANKS

 

I jetted my X 130 main , and moved the clip up one notch on the neadle + I messed around with the air/fuel mixtyre screw. And also the jetting makes it 100% better !!! My friends stock 300ex with a slipping clutch can beat a 300ex with white bros e series pipe and K+N filter because of crappy jetting. I can also beat him with my properly jetted piped X ,good luck

PS for EXTRA "free" power out of your X , while you have the carb off take out the choke plate and you will notice a great performance difference with your K+N , pipe , and no choke plate + proper jetting ,of course. OUT , Zeebo