Another possibility may be the wrong oil for the way you ride. Here is what I mean. Oils are made with different flashpoints. Flashpoint is the temperature where the oil starts to burn. Too low a flash point and the oil won't give adequate protection. Too high and it will accumulate ,more and more in your power valve and pipe till the bike won't hardly run. Lugging the bike in slow, technical, terrain doesn't let the top end of your motor get hot enough to burn off excess oil like it does at higher revs. Motul is one of the more popular brands of 2 stroke oil sold in bike shops here in the states. Motul 800 is the easiest to find and it's flashpoint is 252c/485f degrees. Motul 710 and Motul 510 have a much lower flashpoint at only 90c/195f degrees. I can't run the 800 where I ride but the 710 and 510 are fine.
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