Bigger Briggs engines rarely break flywheel keys. That more of an issue with small engines direct coupled to a blade.
I'd suspect first - early igntion timing - maybe due to a bad Magnetron module - and/or - weak spark.
Break the electrode off an old spark plug, hook it to a plug wire, and see if a blue spark jumps the new enlarged gap. If it does not - it's in sufficient.
Stuck valves can give similar symptoms - but they usually show when an engine has run a while and gets real hot - then the exhausts can hang up. If the valves were rusted from sitting - it would not kick back like you describe.
In regard to valve-tappet clearance - just make sure you have at least enough to close and make sure you don't get a false reading due to the compression release built into the camshaft. Most aluminum engines are .007" intake and .011 exhaust. Most cast-iron engines are .009" intake and .014" - .017" exhaust.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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