Starter/Generator Belt for 1979-1989 Yamaha G1 2 Cycle Gas Golf Cart; replacement for OEM #J10-81173-00. The starter generator belt is responsible for the engine stopping during times the vehicle is stationary, typically during brief stops at traffic lights, or slowing down. The starter generator belt then instantaneously restarts the engine for acceleration purposes. Belts can dry rot and tear over time and require replacing to ensure your golf cart??s performance. A worn belt will slip and your cart will not be able to run properly until it is replaced. This is a high quality aftermarket part made to meet or exceed OEM specifications.Included is 1 Starter/Generator Belt for 1979-1989 Yamaha G1 2 cycle gas models.1/2″ W x 34″ OD (roughly)