Little back story....
Somehow....some way this engine tried to eat the screws out of the throttle plate. Sucked the screws right out of the shaft...both of them, Made their way past the intake valve where it got bent on the way by. Then it rattled around inside the cylinder for a while before the loose throttle plate choked out the engine where it got stuck in the intake....a real mess. The screws while not busting any rings or anything did make a mess of the piston I later found out. So I replaced the carb with a new one, installed a new intake valve and tried to run the engine. The engine had so much blow by it launched the dip stick about 20 feet in the air....I figured busted rings.
In the tear down only the top of the piston was damaged and the walls of the cylinder are in good shape....I just honed them down, replaced the piston, rings, pin..... and put it all back together. Got it running sunday, fired right up.
In the past I always worked on cars, now I have trouble with that so I have started to tinker with mowers. I got an old 1980's Ford YT16 up and going, hopefully this week or so I will have the 300 working, then it is on to an old Sears SS16 / Twin. Thinking of doing a diesel engine in the Sears.
Anyhoo...here is a quick video of the old Kohler brought back to life....the clanking you hear is the engine moving around on the stand, it is not from the engine.
Anyone else mess with vintage lawn tractors....I am amazed at the people that fiddle with these things.