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I know it is not your question, and maybe I am cornfused, but check the knurling on the rear main seal area.

No personal knowledge but have seen mention of "reverse" knurling and oil leaks?






The right hand "reverse" rotation motor does have the knurling backwards. The knurling cam be polished out and a neoprene rear seal used, but why with all the extra unused 440 cranks laying around from all the big stroke motors being built.