I will assume you asking about a petrol motor... usually its incorrect timing settings, find out what the timing setting should be, then adjust to suit a leaky exhaust system will also cause this
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.
I think you are hearing pressure pops. Not a backfire.
Separation of the ethanol due to water in the gasoline.
a backfire is caused by incorrect timing or not enough back pressure in the exhaust pipe
probly needs a valve job
It's lean.
Air in the clutch line and needs to be bled.
Hi, Has a clutch in it and it is not supposed to because it disengages in reverse. Peace, crigby
It's lean.
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Yes
probably 180 deg out on timing