The Vevor 780 Series go-kart primary drive clutch is designed for 4-cycle engines and fits applications using a 1" bore with a 1/4" keyway. Built from steel and aluminum alloy, it is made to replace worn clutch components and help restore smooth, efficient operation. The clutch is compatible with 1-3/16" to 1-1/4" wide belts and matches replacement part numbers 302405A and 302405. Its durable construction promotes heat dissipation and improved resistance to rust and wear. This assembly is intended to reduce noise, vibration, and engagement issues for more dependable kart performance.