It may be your crome covers on your heads. Take your fingers and try to wiggle them . All of these bikes
have some kind of a rattle to them. Most not visible . I have found these covers to be the most often the
problem . You have to tighten just snug . Some times the rubber spacer on the bolts get damaged and
some come up missing.
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low-octane fuel could be the cause. Pinging (also called pre-ignition or detonation) can also be the result of carbon deposits, a bad knock sensor, overheating or incorrect ignition timing
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