Question about 2003 Harley Davidson XL 1200 C Sportster Custom

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It makes a poping sound under a load like one plug does not fire then it does

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Sounds like you have either a weak coil, a weak spark plug wire, or a bad plug. Replace your spark plugs first, they're the least expensive and easiest to replace.

To test the coil you need a "spark tester". It's a thing that looks like a writing pen but is adjustable. It will tell you the "strength" of your spark.

Good Luck
Steve

Posted on Aug 22, 2010

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