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Backfiring is an indication of lean mixture (not enough gas). First thing to do is make sure you don't have any leaks in the exhaust system at the head pipe or the muffler joint that could be pulling in cool air and contributing to the back firing. Second thing is you want to make sure the air jet passages in the back of the carb are clean and the pilot jet is not partially blocked. Third is, assuming step 1 and 2 are ok, put in some fresh high octane gas and richen up the pilot jet.

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15y ago

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