Cr 125 too rich?

My 2000 cr 125 has a lot of oil coming out of the expansion chamber/cylinder. What could be causing this?

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Could need a new gasket/seal, powervalve could need cleaned, could need re jetted.  Also, might be a good idea to re pack the silencer.

Sometimes it spooges out of there, definitely take the pipe off and check to make sure everything is still in tact and sealing, but you need to lean out the bike a little. I'd see if you can get away by going leaner 1 position on the needle clip and turning the air screw out some, if that fails you need to rejet. If you want to be pro active about the whole thing you should just re jet anyways.

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