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Old 03-21-2019, 09:45 PM   #1
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Onan 4000KY runs then lost spark

Onan 4000 ky. Will run after a complete cool down. Runs 30 mins. Then dies. Not a fuel issue. I have no spark. It doesn't get to an overheat condition. I have new coil and plug. Same thing. I have done reconnects for all wiring. I hope it's not a module $$$. Its air cooled but not hot enough when it dies.
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Old 03-21-2019, 10:30 PM   #2
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It could have a bad temp sensor.
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Old Yesterday, 09:23 AM   #3
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Cool All Fixed - It was the ignition magneto

I read many other forums about Onan KY4000 running and lose spark after 30 mins. they chased all the typical stuff but many said change the ignition magneto under the flywheel.

Pn# 160-1358-S0 $106.00

had to drop the unit - disassemble everything in front the of the flywheel.

Use a pulley puller with 3 bolts - you will need to use 5/16-18 self tapping or hand tap the 3 holes. It took a lot of force to get it off. I use a 1/2 air gun.

I swapped magneto - easy - checked any pinched wires - blew out all the junk. had to get a new shaft key to align the flywheel. I dont know if it wasnt there or went missing. I made one from a 1/8x1/8 square key I bought at Ace Hardware.

Now runs great - started right up and had to clear some fuel in the cylinder.

Drove to an event and had to run it all night for AC in Fla.



Ps - this KY does NOT have an oil sensor. no wire in harness and no signs of a sensor - I also does NOT have a temp sensor.

with engines is all about fuel or spark
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Old Yesterday, 09:56 AM   #4
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If the Key was missing, and the flywheel turned slightly, the spark timing would be off.
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Old Today, 03:43 PM   #5
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Talking correct

Quote:
Originally Posted by twinboat View Post
If the Key was missing, and the flywheel turned slightly, the spark timing would be off.

correct - Its very small keyway and key - It ran before and it runs now.

I build race engines and teach machine shop
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