2010-2012 PRO-RIDE RUSH Switchback RMK Service Manual, Page 273Get this manual
Steering and Suspensions Independent Front Suspension (IFS) Shock Settings
To change the IFS shock preloadinstalled spring height, raise the front of the snowmobile up and off the ground to remove the weight from the front suspensionGrasp the spring and rotate itIncreasing IFS shock spring preload too much may adversely affect the handling of the snowmobile and the performance of both the front and rear suspensionsNever exceed one inch (2.54 cm) of adjustment beyond the factory settingWhen decreasing IFS shock spring preload, make sure at least two turns of preload are holding the spring retainer against the springFailure to do so may cause the retainer to fall out when the shock is fully extended