Not Ranked
I assume your back fire is when you let off the gas to change gears? On deceleration of the engine? Many things can cause back fire but a couple of the more common ones are:
Exhaust leak and/or to rich on fuel. Some will say "to lean" can cause backfire but this is generally due to exhaust leak introducing fresh air (additional oxygen) in the flow of spent gases causing additional combustion. Combine this with a "rich" exhaust mixture and you get a BIG back fire going!
Ernie
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