Question about 2004 Harley Davidson XL 1200 R Sporster Roadster
Probably pre-ignition, aka detonation, aka engine knock. DEFINITELY not good on your pistons, crank, and cylinder head. Lower the heat by going one heat range colder than the stock spark plugs, change the engine oil and oil filter and only use premium gas. This will likely take care of the problem. If it continues, get the timing checked at the dealers.
Posted on May 31, 2009
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Posted on Jan 02, 2017
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