This is blow by sometimes caused by bad rings or overflowed oil. I would first drain the oil put in some diesel, shake the bike as much as possible start the engine for a minute or so. This will flush e everything. Drain the oil, change the filter add oil and ride. Mine cleared up after riding a while. My bike leaked gasoline into the crankcase flushing it out. I donĀ“t recommend that. Gasoline in the crankcase can blow the oil pan off if started. I have heard of that happening if the float needle sticks open, mine did. I caught it before starting.
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