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You could have carbon build up on the top of your pistons and heads. Try running a higher Octane gas and hotter spark plugs. Have your timing set with a light by somebody that knows how and use the correct gas. it can be caused by your timing being incorrectly set (pre ignition) this would also mean your bike isn't running to it's full potential, a golden rule is , don't play unless you're prepared for some roadside repairs , learn how on someone else's bike

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Q: What causes a 1999 Harley Davidson EVO to keep running when you turn it off?
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