[bigstik40]

I looked it up on the Yamaha parts site and it is called a "PLUG" - p/n 90338-04840-00. I'm pretty sure it is a stop for the weights/arms when they are at rest (clutch fully open). There are 3 of them, one for each arm. They probably keep the arms from rattling on or banging into the metal of the clutch at very low speed or when you let off the throttle. - RAY

PS-If you decide to replace rollers the set recommended by MikeMac is the best deal around (it also gives you new pins)!! I wish it had been available when I did my clutch.