i have a 91 lt250r and i have plenty of bottom end torque but when i pin it, it falls on it's face and barely gets into the power band!! I think i'm running rich but am affraid to go any smaller with the jet because i've already gone quite a bit smaller!! it has, so i was told, a 38mm Makuni off a 500r quadzilla and i'm runnin a #350 main in it now but started with a 460!! any suggestions?? oh and i've been watching the plug and it is getting black, i haven't cut it but from what it looks like to me it's rich!!

 

black plug = running rich, cut it down a bit

 

that's what i'm going to do, i'm just worried because i've already cut it down a lot since i've had it!! i'll let you know what happens