2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 201Get this manual
PRIMARY AND SECONDARY SHEAVES
3.Apply: BEL-RAY assembly lube (to the guide pin sliding groove 1, and Oring New )
4.Install: Spring seat Compression spring Spring seat Nut Installing steps: Attach the sheave fixed block, locknut wrench and sheave spring compressor to the secondary sheave assemblySheave fixed block: PNYM-04135, 90890-04135 Locknut wrench: PN90890-01348 Sheave spring compressor: PNYM-04134, 90890-04134