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in my experience it was because

1/ the spark plugs were dirty ( i clean the plugs on almost every ride)

2/ the plug gap was incorrect - this stopped the problem - the preset gap was too wide.

3/ Exhaust leak if on deceleration

4/ Timing incorrect (if thru carb)

5/ incorrect valve adjustment

6/ intake valve not seated

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Q: Harley sportster engine backfires
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