unburnt fuel wich goes to your exhaust, where because of the heat ofcourse is set on fire and then strikes flame out of your exhaust! sorry for my English
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.
I think you are hearing pressure pops. Not a backfire.
The main cause of motorbike smoke is when the diesel is being burned and used in the engine. This smoke causes pollution to the environment.
a backfire is caused by incorrect timing or not enough back pressure in the exhaust pipe
It's lean.
start with the spark plugs
It's lean.
Backfire is normally caused by engine out of time, or spark plug wires installed incorrectly.
bad gas
Too much PSI.
Out of time.
Your car is running too rich.