What Causes Abnormal Noises in a Motorcycle Engine?
2 Answers
Abnormal noises in a motorcycle engine occur when, during the power stroke, the piston is subjected to high-pressure gas forces, causing it to oscillate and knock against the cylinder walls, generating noise. Additionally, issues such as piston ovality, bent or twisted connecting rods, excessive tightness in the piston pin and connecting rod bushings (bearings), or the big-end bearing of the connecting rod can also lead to such sounds. Motorcycles, powered by gasoline engines and steered via handlebars to control the front wheel, are two- or three-wheeled vehicles known for their agility, speed, and widespread use in patrol, passenger and cargo transport, as well as sports equipment. Broadly, motorcycles are categorized into street bikes, road racing motorcycles, off-road motorcycles, cruisers, and touring bikes, among others.
I've loved riding motorcycles since I was a kid, and over the years, I've encountered engine noises several times, which can be really frustrating. Usually, the noises might come from a loose chain or excessive valve clearance. I remember once during a long-distance ride, the engine made a rattling sound, and I ignored it. Later, I found out it was due to insufficient oil causing bearing wear, and I had to do a major overhaul. Chain issues are common; you can judge by whether the sound is sharp or dull. A chain that's too loose will make a clicking noise, while one that's too tight will cause excessive friction. I recommend checking the oil level and chain tension regularly, unlike me who waited until the problem worsened. Engine noises often come with other symptoms, like sluggish acceleration or increased vibration. It's best to take it to a repair shop early for professional diagnosis with the right tools, to avoid spending more on repairs later.
