2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 263Get this manual
Rear Suspension TROUBLESHOOTING
Rear Suspension
PROBLEM
SOLUTION IQ 121Switchback: Adjust torsion spring preload to achieve proper static sagChange torsion spring to stiffer optional springRe-valve the rear track shockM-10: Increase FRA positionInstall appropriate optional center retainer on rear track shockIncrease front track shock coil spring preload by adding washersRe-valve the rear track shockCheck the track tensionIQ 121Switchback: Adjust torsion spring preload to achieve proper static sagChange torsion spring to softer optional springRe-valve the rear track shockLubricate pivot pointsMove limiter straps to lower holesCheck track tensionM-10: Decrease FRA positionInstall appropriate option center retainer on rear track shockDecrease front track shock coil spring preload by removing washersRe-valve the rear track shockCheck track tensionIQ Switchback: Change worn rail slidesMove limiter straps to lower holes (lengthen)Always adjust torsion spring preload to achieve proper static sag settingInstall stiffer front track spring to remove ski pressure