Why is the small motorcycle engine making noise?

[SanEdward]

There are many reasons why a small motorcycle engine may make noise. Without specific descriptions, an accurate judgment cannot be made, but a general introduction can be provided. Abnormal noises in motorcycle engines mainly come from the aging of parts and gaps that need adjustment not being adjusted in time. The main gap that needs adjustment in the engine is the valve clearance. The sound of valve clearance is relatively crisp, and the abnormal noise will change with the engine's temperature. Generally, it needs to be checked every 5,000 km or so. Aging of internal parts: If the noise is caused by the aging of internal engine parts, timely repair is necessary. The main parts that produce abnormal noise include the camshaft, small chain, cylinder block, piston, and crankshaft connecting rod. These parts are very precise, and if the gaps are too large, noise will be produced. Falling of parts: Noise caused by other falling parts cannot be ruled out. This type of noise is generally regular and will become very obvious with changes in the engine's speed. When troubleshooting this type of fault, the lubricating oil should be checked first, and then the characteristics of the sound should be used to determine which part is producing the noise.