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Fixed: I adjusted the clearance between the rocker arms and the valve tappets to 4 thousands. Runs great now

I have a 16hp Briggs and Stratton vertical shaft in my riding mower. When I start it, the engine pops and jumps around (it sounds like its cammed or something). Engine will not run with the air filter on, it dies instantly. Even if I put the airbox on (without the filter) it dies instantly. It's...