What happened to Yamaha 125 engine?

Check the fuel supply system first, replace the gasoline filter and clean the fuel injector, which will affect the fuel supply demand standard of the engine.

Second, check whether the power supply system and the ignition head of the spark plug are too large, resulting in slow tripping frequency and affecting the combustion quality of the engine. It is recommended to replace.

Third, check whether the intake system and air filter are dirty, whether the vacuum tube is aging and leaking, and cleaning the throttle valve will affect the intake.

Fourth, check whether the exhaust system and three-way catalysis are blocked, which affects the smooth exhaust. Cleaning or replacement is recommended.

Fifth, check whether the engine cylinder pressure is up to standard, and the standard cylinder pressure is above 8 kg.