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Small amounts of unburned fuel will ignite inside the exhaust during deceleration and cause the "pop"..When you pull in the clutch lever the engine is drawing in less air and reduces the unburned fuel going into the exhaust...It shouldn't cause damage.
Most engines will backfire a lot if the timing is just slightly slow. If remapping doesn't fix it, have someone that knows what they are doing, check the timing.
Mine did it and ended up finding the HD wrench didnt get the mufflers sealed right...
they had to redo them twice and re dyno it toe fix and got 99% of all decell popping out of her...
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