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 - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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