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Little help needed troubleshooting LX277 Engine Misfiring

3361 Views 9 Replies 6 Participants Last post by  Justy37
I have an LX277aws with the FH500V 2-cyl engine. I've already syphoned out the old gas and replaced with fresh 93 octane. The fuel filter is new, the air filter is new, the carb has been inspected and cleaned. The spark plugs have been replaced and gapped to .040 per JD spec. The engine seems to idle ok but as the RPM increase there is misfiring. Could a coil be going bad causing the higher RPM misfire? I've already pulled each plug individually while it's running to see if it dies, and each cylinder is firing as the engine stays running. Any suggestions to narrow this down without throwing parts at it?
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Define "carb has been inspected and cleaned."

I would remove the carb and take it apart completely and soak it in a dunk tank a couple of days. Then reassemble with new parts from a kit and put it back on the motor.

On one of mine I had to do the head gaskets. It would puff smoke out the cyl / head joint on start up. You would only see this without a hood. Even with the leaking HG the motor still ran smoothly.
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