Question about 2004 Harley Davidson FLHR - FLHRI Road King

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ENGINE WONT IDLE POPPING BACK THRU BREATHER - 2004 Harley Davidson FLHR - FLHRI Road King

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From your short description, you might be looking at a stuck exhaust valve or broken valve spring.
What happens is the valve that opens above the cylinder to allow the exhaust gasses to escape may be shut, so when the intake vale opens to allow the gas in - and the spark plug ignites it - the explosion is forced back up the intake system (instead of out the exhaust), making the popping noise you're hearing.
Whatever the case, it could be a few related things - all not good. Looks like a trip to shop is needed.

Posted on Jan 09, 2011

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Posted on Jan 02, 2017

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