What are the reasons for the buzzing sound in a motorcycle engine?

[GageFitz]

The reasons for the buzzing sound in a motorcycle engine are: 1. The battery is old and has no power; 2. In winter, the temperature is relatively low, and the engine has not completed preheating; 3. Spark plug failure, the spark plug has been used for too long and its performance has degraded; 4. There is no gasoline in the fuel tank; 5. Low temperatures cause the viscosity of the engine oil inside the motorcycle to increase, and in cold temperatures, the oil may even solidify into clumps. Solutions for the buzzing sound in a motorcycle engine: 1. Check if the automatic choke is stuck in the closed position; 2. Check the engine's compression. If the valves are leaking or the engine is severely worn, it will be difficult to start when cold; 3. Park the motorcycle indoors or in a warmer place, and press the throttle a few times before starting the engine; 4. Clean the carburetor.

[TimothyDella]

During my long-distance motorcycle trip, the engine suddenly made a high-pitched squealing sound, which made me uneasy. The noise resembled metal friction. After stopping to inspect, I found the exhaust pipe joint screws were slightly loose, and the noise reduced after tightening them. Later, a friend shared that such squealing noises might originate from aging exhaust gaskets leaking air or dry chain friction. When the chain lacks lubrication, it can produce creaking or squealing sounds, which can be quieted by adding chain lubricant. For belt-driven models, improper belt tension can also cause squealing. Additionally, loose spark plugs or faulty electrical connections can generate arc-induced buzzing sounds, which are quite piercing. I believe it's crucial not to delay—immediately perform a simple check on chain lubrication and exhaust pipe tightness. If it's something more severe like bearing wear, delaying repairs could damage engine components. Riding safety comes first; always stop to address abnormal sounds promptly, as minor issues can escalate into major accidents.

[SanKingston]

I have years of experience in motorcycle maintenance, and that zizi-like noise is quite common. The most frequent causes include a damaged exhaust system gasket or loose connection screws, where gas leakage produces a hissing sound. A dry or loose drive chain can create a creaking noise when rubbing, which can be fixed by applying some lubricant or tightening it. For belt-driven motorcycles, insufficient belt tension can cause an annoying slippy sound while riding. Electrical issues, such as loose spark plug wires or coil problems, might produce an arcing hiss, similar to a lighter. Worn-out bearings can also generate similar friction noises. I recommend owners start with the basics: check if the exhaust pipe is abnormally hot or if the chain needs maintenance. If the noise persists, don't push it—get it checked in detail at a shop to prevent minor issues from turning into major repairs.

[Seth]

When I first bought a used motorcycle, I rode it out and heard the engine making a zizi sound, which really brought my mood down. I learned to check it myself and found the chain was loose and lacked oil. After lubrication, the noise reduced significantly. Another time, there was a gap at the exhaust pipe joint, causing a hissing sound from air leakage, but tightening the screws fixed it. Online research suggested that improper valve clearance adjustment could also cause a zizi sound, or an aging and loose belt. As a beginner, I realized the importance of basic maintenance. Regularly check the chain tension and keep it clean and lubricated. If the sound suddenly appears, stop and feel the exhaust and chain areas for abnormal vibrations or high temperatures. Ignoring these issues can accelerate wear, reduce engine performance, and cost more money in the long run.