04 cuts out before revlimiter?

[jeff malone]

I have a 04 450r and at my last harescramble i put a fmf mega bomb header on and it cracked in couple places, didnt notice till race was over, i have replaced the stock header with 4.1 silencer now it has lost power and stumbles before revlimiter, what could be wrong with it , thanks

[jeff malone]

it also has burnt almost all of the oil in the motor!

[bk111]

Possibly too rich. Jetting? Not sure about oil.

[450RRyder]

sounds like the rings are bad, and check the slow jet on the carb,

[rap169]

if its acting like a rev limiter but at a lower rpm its prob too rich on the main.