Question: How critical are the small/thin o-ring seals on a Rotax 503 crankshaft? Someone is telling me they are not needed.

Answer: The o-rings you see on the crankshaft bearings are to keep the outer race of the bearing from rotating within the crankcase.. Yes they are necessary
DOC032618-03262018122036.pdf (You do not have access to download this file.)
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