The Yamaha Drive Clutch Primary Sliding Sheave is an essential part of your golf cart. There are two clutches for your Yamaha, one being the primary or drive clutch located on the engine. It has a belt that drapes around it and connects it to the secondary or driven clutch. As the motor spins faster and faster, weights inside the primary clutch cause a centrifugal effect, making the sheaves of that front clutch pull closer together. This makes the belt connect the two clutches a lot tighter, separating the sliding sheave from the fixed sheave on the secondary or driven clutch located on the rear axle.As you can imagine, the drive clutch primary sliding sheave is a very high-wear item. That's why we created an aftermarket replacement that you can get from Buggies Unlimited at a fraction of the cost and time it takes to get it from a dealer. Not to mention they are going to want to install it and charge you for that as well. Call now and get one ordered.