2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 171Get 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 the sheave fixed block in vise and secure itTighten the sheave spring compressor nut and compress the springInstall the nut and tighten it to the specified torque using the locknut wrenchNut: 90 Nm (9.0 kg, 65 ft lb)