What Causes the Zizzing Noise in a Scooter Motorcycle?
2 Answers
The causes of the zizzing noise in a scooter motorcycle are as follows: 1. The zizzing sound when starting the scooter motorcycle may be due to the slipping sound of the overrunning clutch. Worn or damaged overrunning clutch, combined with the high resistance of a cold engine, can produce this noise. Inspect the clutch and repair or replace it if necessary. 2. If the zizzing sound occurs easily upon starting, check whether the carburetor's air-fuel mixture is too lean, whether the idle speed is too low, whether the carburetor's electronic choke is malfunctioning, or whether the carburetor itself has poor performance. Also, check whether the valve clearance is too small or not properly closed, and whether the spark plug is faulty.
I also encountered that annoying buzzing sound when riding my scooter before. At first, I thought it was the wind hitting something, but upon closer inspection, I found it was an issue with the drive belt. Over time, when the belt wears out or becomes loose, it can produce that sharp noise. Additionally, insufficient lubrication or rust on the bearings might cause similar sounds. Another possibility is small stones or dust stuck in the brake pads, causing constant noise when rotating. That time, I tried handling it myself: first, I stopped the scooter and listened closely to locate the source. If it was the belt, I checked if it needed tightening; if it was the brakes, a thorough cleaning usually did the trick. However, for safety reasons, I eventually took it to a repair shop—they replaced the belt, and the problem was completely fixed. Remember, don’t ignore such unusual noises; they could be early warnings of bigger issues, and delaying repairs might lead to accidents.
