Why does the UY125 produce a whistling sound?
2 Answers
The UY125 may produce a whistling sound due to increased play between the tail box and its base. Here are specific solutions to address the whistling sound in the UY125: 1. Use thicker and harder materials: Some experienced riders have created blueprints and used laser cutting to produce 304 stainless steel lock plates, which resolved the issue after replacement. 2. Wrap with electrical tape: First, remove the four screws inside the box to facilitate lock removal. Use a flat-head screwdriver to pry open the quick-release button to remove the lock plate. Visible signs of deformation can be observed. Wrap the end of the lock plate with several layers of electrical tape to increase thickness and fill the slot, then reinstall following the reverse steps of disassembly.
The whistling sound from my UY125 last time was due to an issue with the drivetrain. This type of scooter can produce high-frequency noise from the friction between the belt and the variator during acceleration. Upon inspection, it turned out to be dust accumulation in the drivetrain air intake causing abnormal airflow whistling, which was resolved after cleaning. It could also be due to insufficient lubrication in the front wheel bearings, resulting in squeaking sounds while riding. Another time, it was the aging seal of the air filter box leaking air, causing a whistling sound above 40 km/h. I recommend first identifying the sound's location by revving the engine while stationary to determine if it's coming from the engine area. These parts are cheap to repair; cleaning the dust from the drivetrain box took me half an hour, and a repair shop would charge only a few dozen for labor. Regular maintenance is key; I check the drivetrain ventilation port every month.
