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#17020
chinewalker
Participant

    US Member

    There is no seal in a CD-13. It relies on a volume of oil in the mix to seal the bronze bearings of the crankcase to the crankshaft. There is a slinger that is supposed to prevent migration of the oil out of the crankcase, but if the upper bearing surfaces are excessively worn, it may not be enough. Is there any side-to-side play in the crankshaft?

    It’s also possible someone merely got too crazy with lubing the points cam or the wick. Been known to happen…