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Except that it happens only after and hour of running, I'd be looking at the flywheel key, but it sounds like you're on the right track ...Maybe the exhaust valve gets sticky or warps a bit when it gets too hot. If it isn't closing all the way, it would get hot and backfire. I'd also be sure the engine is clean and cooling as well as possible of course. Good luck!
loosen the pinch nut for the gov arm. have throttle at full. rotate the gov shaft in the same direction that the arm is for full throttle and tighten the pinch bolt.
The usually have one wire connected to the sensor. You can bypass it by either unhooking the wire or connecting to ground possibly, check for spark either way.
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weak spark could be a ground problem or it could be module itself check the wires that go to the module for nicks or cuts if none exist I would lean more toward the ignition module
Simplest test is to leave it on the engine, battery hooked up normally. Run the engine at normal full speed (not just idling) and use your voltmeter to measure the voltage across the battery with your DMM. If you measure 13.5 to 14 volts, your rectifier/regulator is probably OK.
It can't easily be tested off the mower. You'd need a source of AC at 24 volts to simulate the motor's stator winding, and a load that draws about 23 amps at 12 volts.
Don't forget a bad battery can cause failure to charge - it's not always the regulator.
Your last 2 sentences simplified my response greatly. Thanks. You need some fairly involved work done. Bring it in. The good news is that Kohler makes some very nice engines and it is well worth what you will pay for the work.
If you know enough to remove the engine and re-install it correctly, just bring in the engine and you will save some money.
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