What Causes a Motorcycle to Lose Power When It Gets Hot?

[StellaFitz]

Motorcycles losing power when hot can be attributed to the following reasons: 1. Overly rich air-fuel mixture: If the issue only occurs when the engine is hot but functions normally when cold, it is generally caused by an excessively rich mixture due to various factors. Even after replacing the carburetor with a new, quality-assured unit and ensuring correct adjustment of the mixture ratio, choke, and needle valve, you should also inspect whether the air filter is clogged, as this can also lead to a rich mixture. 2. Ignition system failure: Check for issues with the high-voltage electricity. Some motorcycles may experience ignition component failures when hot, such as malfunctioning igniters, faulty ignition coils, or damaged stator coils in the magneto, resulting in misfires when the engine heats up while showing no obvious abnormalities when cold. If the spark plug, air filter, and carburetor are confirmed to be functioning properly, further inspection of the ignition system components is recommended.