What are the reasons for a scooter making a sizzling sound but failing to start?

[DelElizabeth]

The reason a scooter makes a sizzling sound but fails to start is due to issues in the ignition system or fuel supply system. When this happens, it is recommended to check both the ignition system and fuel supply system. The main types of spark plugs include: standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs, among others. Scooters generally feature a continuously variable transmission (CVT) with an automatic clutch, lacking gear design. Once started, you simply twist the throttle to move, and releasing the throttle will gradually slow down until stopping. Additionally, scooter wheels are smaller than those of other vehicles, and the transmission is mostly belt-driven.