To add to Bill's advice, I'd also suggest heading over to Kohler's website and downloading the service manual for the engine. It'll have the most current and up-to-date overhaul info in it.
Your muffler box is broken right where I figured it would be. I can see a bolt in there for the muffler support that doesn't look right, and light around a jagged hole where the mounting boss used to be.
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