Quick Jetting Question

[yernkie]

I got a quick question...what color will the smoke be is a bike is jetted too fat (rich)?

[2004exrider]

Black

[yernkie]

damn...that what i was thinking. this thing is smoking white smoke like mad. it still runs great, but just smoking. I just put the motor back together, but they were with parts the previous owner gave me, so maybe ??? the cylinder, piston, and rings looked good, so maybe it is valve seals...the one thing i didn't replace (doh!).

[2004exrider]

Valve seals are a pretty common problem on the 400ex. If it's smoking on initial startup (after sitting for a while) or when down shifting and letting the engine rev up higher its more than likely the seals.

Jimmy

[yernkie]

Its not more my 400, its my atc200x. I guess I shouldn't be surprised that a 22 year old motor is smoking.