What are the reasons for abnormal noise from the NANJUN Ruikang engine?

[JulietteFitz]

NANJUN Ruikang engine abnormal noise may be caused by aging or loosening of engine mounts, engine misfire noise, excessive rich mixture, etc. Aging or loosening of engine mounts: Engine mounts are the rubber blocks between the engine and the frame. Once these mounts age or become loose, the engine will vibrate, resulting in abnormal noise. Engine misfire noise: Engine misfire mainly refers to one or more cylinders of the engine not working properly. Timing gear noise: After long-term use, coupled with improper gear clearance adjustment and hardening of the timing belt, the gears will experience excessive wear. In severe cases, the gear teeth may even wear out, causing loosening between the meshing gears.