Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 265Get this manual
STEERINGFRONT SUSPENSION Front Suspension Setup and Adjustments
Spring preload is one of the adjustment options which affects ridePreload is the amount of pressure at which the spring is heldThe longer the installed length of the spring, the less the amount of pre-load; the shorter the installed length of the spring, the more the amount of pre-loadAn increase in IFS shock spring pre-load will result in an increase in ski pressureTo adjust front spring preload on threaded adjust models, grasp the spring and turn in clockwise direction (as viewed from the top of the shock) to increase the preloadTurn in counterclockwise direction to decrease preloadillistration 1) Turning clockwise increases preload 1
In the illustration 2, high preload and low preload positions are depictedWhen adjusting, be sure springs on both the left and right sides of the machine are at the same adjustmentCAUTION: Increasing IFS spring preload too far can result in shock and bulkhead damage due to "coil binding"To determine if your machine is using full travel, push the shock jounce bumper down as far as it will go on the shock rod and test ride the machineSee Illistration 3) SPRING RATE The correct spring rate will allow full travel of the shock with occasional LIGHT bottomingIf full travel is not being used you can: Decrease clicker position (if aplicable) Install lighter spring rate Revalve shock (if aplicable) If hard bottoming occures: Increase clicker position (if aplicable) Install heavier spring rate Revalve shock (if aplicable) Shock rod Low Preload High Preload