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bad crankcase seal?

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I have a 99 cr125 that just the other day started haveing no powerband and the revs would not drop after pulling in the clutch. So I checked my reeds and there fine and now it smokes like a frieght train and pours oil out of the exhuast. So I thought I would check the crankcase oil level and when I did it was low and I just changed it 3 days ago. So is my crankcase seal bad?

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Yep. Time for crank seals.

 

Probably time for a crank and main bearings too. When the bearings start to get a little wear on them the runout in the crank will eat the seals quickly, even new ones.

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