Yamaha drive clutches are better known as a primary clutch. This clutch attaches to the motor though a drive shaft. The clutch is open until the motor turns over. The clutch then closes while the secondary clutch opens up. The primary clutch functions as the carts beginning momentum. A faulty primary clutch results in loss of torque and hill climbing. We carry Comet and replacement clutches that fit Yamaha G1, G2, G9, G14, G16, G19, G22, and G29 The Drive gas golf cart models.