Quote:
Originally Posted by john hall
So did it appear the flywheel had ever been removed? The only engines I remember this being an issue on were the old Briggs, those things were bad about shearing keys, but most of the time it had to do with the last guy that worked on it not getting the nut tight enough--Think a lot of them used the ratchet for the recoil and most folks didn't have the proper tool for tightening it--smacked it with a big hammer instead.
Leave push mowers that run into obstacles out of the conversation, that's a different scenario all together.
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I can't tell it was removed, but my best assessment is that the nut holding the flywheel on became loose over time, resulting in the flywheel key slipping. It eventually stripped the flywheel male section of the key over time, eventually throwing the timing off. I placed some titelock and used a torque wrench to get it set back home.