Clutch Discs - 180mm W/o springs

This disc transfers the power from the motor to the transmission. To check an old clutch disc, use a 7mm wrench and try to put the open end over the thickness of the disc. If the wrench goes on, you should think about replacing the disc. There are basically two types of discs, ridged and one with springs. The spring type has a little give before it engages, reducing the shock on the transmission. The ridged discs are good for dirt cars or someone who wants to race at the drag strip.