Why is the downshifting sound of a motorcycle very loud?

[LeWilliam]

Motorcycle downshifting sound being very loud may be due to temperature issues, load issues, and lubrication issues. Below are detailed explanations of the causes: The loud sound may be a temperature issue: Some engine noises appear as the temperature rises, while others diminish with increasing temperature. Some noises are often accompanied by heating phenomena. Therefore, in addition to listening to the noise, it is also necessary to measure the temperature to assist in diagnosis. The loud engine sound may be a load issue: Load has an impact on noise. Noise generally increases with the increase in load, which is a common pattern of noise. The loud engine sound may be a lubrication issue: Regardless of the type of noise, when lubrication conditions are poor, the noise is usually more severe.