What causes unstable idle speed and easy stalling in motorcycles?

1 Answers
VanSebastian
07/29/25 12:25pm
Motorcycles experience unstable idle speed and easy stalling due to excessive idle speed. Reasons for excessive idle speed: The idle switch does not close, the idle control valve malfunctions. The normal idle speed of an EFI engine is maintained by the idle speed control valve (ISC). Intake manifold leaks. According to the engine idle control principle, incorrect valve timing occurs. For models using mass airflow sensors, these sensors employ a constant temperature difference. Fuel injector dripping or clogging, exhaust system blockage. Reasons why the idle switch does not close: When the idle contacts open, the ECU determines the engine is under partial load condition.
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