What Causes Abnormal Noise in the Transmission Case of a Scooter?
1 Answers
Abnormal noise in the transmission case of a scooter may be caused by damage to rotating gears, bearings, etc. The reasons for abnormal noise in the transmission case of a scooter are as follows: 1. Relationship between abnormal noise and engine speed: Most common abnormal noises depend on the engine speed state. 2. Relationship between abnormal noise and load: Many abnormal noises in the engine are clearly related to its load. During diagnosis, the method of gradually removing the load can be used for testing, usually by using single-cylinder or dual-cylinder misfire to remove the load of one or two cylinders to identify the relationship between abnormal noise and load. 3. Relationship between abnormal noise and temperature: Noise occurs at low temperatures and diminishes or even disappears as the temperature rises. 4. Relationship between abnormal noise and the engine working cycle: Abnormal noise faults in the engine are often clearly related to the engine working cycle, especially the abnormal noise of the crankshaft connecting rod mechanism and the valve mechanism, which are related to the working cycle. 5. Relationship between abnormal noise and the engine location: When abnormal noise occurs in the engine, it will produce a certain degree of vibration. The characteristics and location of the vibration can assist in diagnosing the cause of the abnormal noise.
