How to Solve Motorcycle Backfiring When Throttle is Released?
2 Answers
Motorcycle backfiring when the throttle is released can be resolved by replacing the spark plug. Related explanations: 1. Causes: Motorcycle backfiring upon throttle release is generally caused by an overly rich air-fuel mixture due to various reasons, such as a clogged air filter, improper carburetor mixture adjustment, incorrect use of the choke, or excessively high fuel level. 2. Spark Plug: The spark plug (spark-plugs), commonly known as the sparking plug, functions to discharge the high-voltage pulse electricity sent from the high-tension lead, breaking down the air between the two electrodes to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. Main types include: standard spark plugs, extended insulator spark plugs, electrode spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs, among others.
When repairing motorcycles, I often encounter backfiring issues when the throttle is released. This is mainly caused by a lean air-fuel mixture—when the throttle is released, more air enters while less fuel is supplied, and the spark ignites the residual fuel, causing a popping sound. It could also be due to ignition system problems, such as worn spark plugs or leaking high-tension wires, where the spark fails to occur at the right time. Alternatively, exhaust system leaks due to poor sealing might be the culprit. To resolve this, I recommend first checking the condition of the spark plugs and trying new ones. If that doesn’t work, inspect the carburetor settings and adjust the idle circuit to increase fuel supply. If the exhaust gasket is worn, replace the sealing components promptly. Don’t neglect regular maintenance—cleaning the air filter monthly can effectively prevent such issues. Address problems promptly, as delays could damage the engine or cause backfires, which can be quite dangerous.
