What Causes Backfiring in a Motorcycle Engine's Exhaust Pipe?

[LePiper]

The reasons for backfiring in a motorcycle engine's exhaust pipe are: 1. Overly rich air-fuel mixture leading to incomplete combustion; 2. Minor damage to the ignition system causing incorrect ignition timing; 3. Incorrect valve timing affecting normal valve opening and closing; 4. Mechanical failures such as broken piston rings or cylinder damage. The correct method for shifting gears on a motorcycle is: 1. Before shifting, twist the throttle to increase engine power and maintain speed during gear changes; 2. Quickly close the throttle after slightly increasing it; 3. Use the left hand to firmly grip and disengage the clutch lever in preparation for shifting; 4. Step on the gear shift pedal to shift to a higher gear; 5. Gradually release the clutch lever; 6. Promptly twist the throttle grip backward to reopen the closed throttle.