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Welcome to the world of old-tech 2 stroke ownership.
Up to 40% of the fuel oil mix is blown out unburnt, at idle rpms.
This unburnt fuel/oil mixed with carbon from the burnt fuel
deposits in the mid section exhaust housing, then trickles out
after you've turned off the outboard. If you bucket flushed,
you'd end up with a visible ring around y'er lower unit
from the fuel/oil/carbon mix floating on top.
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