Question about 2004 Harley Davidson XL 1200 R Sporster Roadster

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I'm getting knocking/pinging during acceleration with RPM around 4000.

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  • ajl_tec May 31, 2009

    Okay, here's the deal. I had replaced the plugs with harley's double platinum plugs thinking these plugs would be better, I swapped them out today with the "original" plugs with the same gap and amazingly the knocking went away, I took my rpm's up to 4800 with out a problem, i get better starting and smoother highway speed. thanks for the tip

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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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