See if there is a heat shield for spark plug. Make sure proper plug is installed and gapped.
SOURCE: kohler 12kw generator starts but shuts down after 3sec
Your gas pressure is too low and you may not have a large enough supply pipe. You need at least 10 inches of water column with the engine running to operate an LP vapor fueled engine. Because the engine is starving for fuel, its governor opens the throttle to WOT (so it goes to high revs) but there isn't any fuel to make horsepower with so the output voltage falls and the undervoltage alarm trips.
Carl
SOURCE: New Onan 4000 watt gas RV generator cuts out
The generator engine is jetted for sea level. When you run at 24 hundred feet, it's flooding out. That's what you smell. The carb will need to be jetted for high altitude.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c
SOURCE: 1975, 7.5 Kohler marine genset, runs only with the reset depresed
Can't search for a manual without model, type, serial, etc numbers...
A few things to take a look at:
1) Oil level / pressure sending unit. This is normally bypassed as long as the start switch is pressed. When engine starts, and switch is released, engine will die if sending unit is defective, or you are low on oil.
2) Exhaust temperature sensors. Older units were notorious for burning these up.
3) Cooling Water Temperature sensor. These cause trouble often, but mostly due to water pump impeller being eaten away by galvanic action and not able to pump water as effecively. End result is water temp higher than normal, which trips the switch, which kills the engine.
4) Alternator (generator) output not as it should. If output doesn't rise to proper level within a few seconds of engine start, the engine will be shut down.
5) Choke not working as it should
6) Bad fuel, bad fuel pump, clogged fuel filter.
SOURCE: onan generator dies after 2-3 hours of running ,
This sounds like overheating. These small generators don't have overheating protection, but if a low oil pressure or low oil level is present it may be the reason for stopping.
Check the oil level in the starting conditions and again when it stops. It may become under the "stop" level and after some time the precipitated oil has reached the "start" level. The same may be with oil viscosity and oil pressure.
Try to add some oil or change the oil with bigger viscosity.
SOURCE: My 18RESL Kohler Propane Generator ran for 8.5
You have to reset it because it locked out on on under frequency. Just pullout the fuse on the control panel and then reinstall it a couple of seconds later. Now it will reset the fault codes. Hope that helps.
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