1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 94Get this manual
FRONT AND REAR SHOCK ABSORBER ADJUSTMENT'
INSP ADJ
1Adjust: Spring preload
Spring preload adjustment steps: Elevate the rear wheels by placing the suitable standLoose the locknut Adjust the spring preloadNOTE: The length of the spring (installed) changes 1.5 mm (0.06 in) per turn of the adjuster
3) Spring length
Stiffer Increase the spring preload1 (Turn the adjuster) in Softer (b) Decrease the spring preload1 (Turn the adjuster) out