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I see questions about starting all the time. Here is a mystery that had me baffled. The B&S engine on our rider was not starting. It had fuel, spark, compression. Everything an engine is supposed to have to run. I was dumbfounded. I removed the cover from the top just to have a look. As I was closely examining it I noticed the cutouts for the flywheel key and crankshaft did not line up. So I pulled the flywheel off, and surprise! The flywheel key had sheared. New key, and the trusty old B&S is still running ten years later.

You must have smacked something pretty hard

platefire said:

You must have smacked something pretty hard

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That is why it was such a mystery. It didn't hit anything. Might have been a backfire when shutting down.