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Author Topic: Microcosm Shovelhead R31 engine  (Read 4542 times)

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Re: Microcosm Shovelhead R31 engine
« on: March 24, 2023, 01:56:19 pm »
Mike,

I’ve found an easy way to prevent my Knuckle from jumping spark… use a dummy battery to reduce the CDI power from 4.5 to 3 volts.  You can get a dummy battery on Amazon.  After I did this with my knucklehead, I haven’t had an issue since. 

Since this didn’t solve your problem, have you tried adding a piece of silicone tube to the body of your spark plug?
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