2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 125Get this manual
PRIMARY SHEAVE AND DRIVE V-BELT
6Install: Primary sheave spring Primary sheave cap 2
Be sure the sheave cap match mark (X) is aligned with the spider match mark (X)Primary sheave cap bolt: 14 Nm (1.4 kg, 10 ft lb)
INSTALLATION
1Install: Primary sheave assembly