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400ex rebuild problem

1932 Views 5 Replies 4 Participants Last post by  mizzymatt
I have a 400ex i bought and it smoked like a chimney it was stock bore sent it to a shop ordered a 11to1 416 kit and got the cylinder bored slapped it back together with a stage 1 hot cam runs great has tons of power but after about 15 minutes of riding it slightly smokes oil out of the exhaust could this be the valve seals, oh i also lapped the valves.
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thank you i am going to bring it to my buddys and do the valve seals and adjust the valves i tried don't think i did it right
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