What Causes a Scooter to Have No Idle Speed?

[SanOmar]

After starting the motorcycle, if the throttle grip cannot be fully released without the engine stalling, it is referred to as the motorcycle having no idle speed. If the idle speed fluctuates erratically with unstable RPM, it is called unstable idle speed. Generally, motorcycles are factory-adjusted to have a proper idle speed. If idle speed issues arise, repeated adjustments should be made according to the manufacturer's instructions. If the idle speed problem persists after repeated adjustments, the following causes may be responsible: 1. Incorrect ignition timing: This affects idle speed performance. The ignition timing should be adjusted as specified to ensure accuracy. 2. Engine air leaks: Check for proper sealing between the carburetor and the engine, as well as the spark plug, cylinder head, and crankcase. Ensure the spark plug is functioning correctly and the gap between its electrodes is properly adjusted. Verify that the idle jet in the carburetor is unobstructed and the air filter is clean to maintain proper airflow.