Centrifugal clutches are a bit different than the style of clutch you might be familiar with. They aren't used much on cars, but are commonly found on vehicles like scooters and go-karts.

The Hartman go-kart is outfitted with Walbro carburetors, Tomar centrifugal clutches, RLV expansion chambers, Burris Racing engine mounts, an MCP rear disc brake, an OTK clear fiberglass seat ...