JW450R1
12-31-2006, 05:20 AM
so my freind just bought a yfz 450.10 minutes of riding and the header pipe is cherry red.i no they run a little lean.i've been reading some of the threads.the problem is that he brought it back to the dealership and they messed with the carb. 3 different x's.now it stalls and back-fires.yammi says thats normal.can any-one help us out.i think maybe he burned a valve.he just got a pipe and jet-kit for christmas,but he doesn't want to install it until it is running right first......help