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You mentioned you checked valves, head gasket, flywheel, etc. Without knowing
what year it is, look on shroud, it will tell you what model, type, serial number the engine is. It’s been awhile since I played with one, there should be a couple head bolts that are longer then the others, they go to the muffler side, flywheel key is what times engine, make sure it is in good shape. Use torque wrench on all nuts & bolts and tighten to correct tightness. All it takes is a kickback from the engine to shear the flywheel if the flywheel nut is not torqued to correct specs.
You mentioned you had carb apart, did you adjust mixture needles?
Find numbers on shroud, then look up torque specs for engine, then check bolts & nuts for correct tightness. I guess the other problem could be the choke, when motor is cold, I would pull motor over first, if it didn’t start the I would choke it until it fired, then take choke off, easy to flood. Just like working on outboards, check and clean, retorque everything, is real important.