I have a 1998 60 kw Kohler auto start generator. Replaced alternator head today. Engine now cranks and runs for 30 seconds to 1 minute then shuts off. Any ideas?

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Kohler generators feed the generated voltage back into the control circuit board to tell it to keep the fuel pump (electric) runing and the ignition on. IF there is no voltage generated (bad brushes or?) then the symptom you describe will occur. The motor runs fine, but it isn't generating electricity.
Jim Russell

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What you need to know is there enough fuel going to the regulator. It should be 7 to 11 inches Water Column. If not your problem may be not enough fuel. That includes when the heater in your house kicks on and what ever gas appliance you may have. Once you verify that you need to figure out if you have the proper pressure coming out of the regular on the inside of the generator. Next I would look at compression of the cylinders. It may need new piston rings.

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Check all the ground wires and make sure their not broken or loose. If the wires are good next check the neg. Wire to the coil. Too check the swiitch make sure you have continuity too all the post when the switch in the on position, this requires removing the switch.

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Check gas pressure. Oc is over crank. Means tried to start but did not.

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U need to make sure that the relay driving ur auto start stay closed all thru the crank cycle.