If you have to split the cases and you don't have the experience, trust me just spend the $300 and get a brand new engine. It only takes a couple people less than an hour to install and is a known good engine instead of trying to replace seals only to realize you need new rings, or a new cylinder, or a new oil pump, or new stator etc., etc. Heck if you don't trust yourself turning the few bolts and nuts to install the engine, any competent scooter or even motorcycle place should be able to install a whole engine for only an hour's charge. If they try to charge you more they're ripping you off.
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