On my black engine, the center of that support spins around the little round collar on the side plate the very middle.. on my copper 5 hp that was open when I got it so I just put a plug in it and I missing something on my copper engine on the inside of the engine
That is the cam. Runs counter the the crank and is for belts, etc.
Black one had it's shaft cut off probably with Hacksaw blade while engine runs, done many that way.
The extended camshafts and the open side covers have value for those who need parts for a garden tiller. The extra pulley on the extended camshaft was typically used for reverse operation on older garden tillers and snowblowers.
The plug is from Home Depot. It’s actually a cap. I think it’s 3/8 turn it inside out put some gasket sealer on it and put it in the hole and let it dry. Wipe off all excess
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