yzf 450 missing at steady throttle

hey i got a yzf 450 , o4 that has a slight miss when holding a steady throttle.it does not matter what rpm your at. it runs and pulls hard. this bike was a leftover and has only about 8 hours time on it. some one help me!!!!!!!!!

It may need to be re-jetted and have the fuel crew adjusted.

Jetting is too rich

Mine is doing the same thing, and it just started last weekend even the back fender has black stains on it now from the exhaust. I have alot of hours on this bike this year and never had a problem like this?

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