2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 120Get this manual
PRIMARY SHEAVE AND DRIVE V-BELT
Fit the primary sheave assembly onto the adapter and secure the supporting plates 8
Securely fit the projections on the adapter into the fixed sheave holes Set the bar wrench onto the spider and turn the special tool clockwise to loosen the spiderClutch spider separator (bar wrench): 90890-01711, YS-28890-C