I suppose the fact that a two-stroke engine normally burns oil means
that there will be a small leakage of oil from the exhaust? After
running the thing for two hours or so, one drop came out of the
exhaust. That's normal, right?
I never saw come out of exhaust, but seems reasonable. It's going to
condense if there is smoke, but should also evaporate when hot. My trimmer
leaks out the gas cap if I don't set it in the right position.
I've never seen oil come out. Nor would I expect it too.
The oil is in a very low concentration in the gas and should
burn. Even if some gas/oil mix came out unburned
somehow, it would be 40 times more gas than oil so
it wouldn't really look like oil.
If there was a slow fuel leak, the gasoline in the leak would
evaporate first, leaving the oil(y) substance behind to drip out. But
if the exhaust was hot from running for two hours, like the OP said,
then something doesn't make sense. Even the oil would be evaporated.
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