Craftsman Mower 917.376240_REBUILT WONT START

I doubt that it would have caused the spark plug to blow out. If you didn’t reset the valve clearances, that could be your problem, especially if you refaced the valves and cut the valve seats.
 
Rivets said:
Have you checked the valve clearance on both valves?
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No I have not. I'm not sure on where to check for clearances inside the block? On top of the valves are tappets. Should I stick a feeler gauge between the tappet and plastic camshaft?
 
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