Originally Posted by Ultrafrozen

Not sure if Yamaha clutches are fully enclosed but if not, wash with warm soapy water. Just pour it on and try to get it inside, let it soak and rinse off with a hose. I personally stay away from solvents 'cause I'm not sure how they affect the fiber bushings (if your clutch has them). The belt contact faces can be cleaned with rubbing alcohol soaked rag.