My son's 08 KX85 has always smoked since we got it. The guy I bought it from toldme that he ran a 32:1 mixture. It has oil coming out of the exhaust pipe, I ran his KX65 at 32:1 and did not have this problem. I have backed the mixture to 45:1 and still have the smoke and oil out of the exhaust pipe. I have not messed with 2 stroke bikes that much. A couple of guys at the race track told me it needs a new top end. Do you guys think that maybe the problem.