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sounds like one of your oil level sensors is stuck , your top tank on the engine thinks it's low so it keeps telling the lower tank pump to resupply ans pump up more oil.
Thus causing the upper tank to overflow, the overflow drains into the air box.
Then it runns out of the air box.
If the air box gets splashed with the extra oil and the engine is running, it will suck the additional into the engine plus what is normaly injected.
Thus causing the extra smoke.
Take out the oil tank sensors and clean them with carb. or brake cleaner.
I had that issue with my old yamaha engine, I also had a computer that would tell the oil injection to keep pumping the oil. Caused the same problem.
Good luck.
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