2008 Polaris ATV Predator 50, Sportsman Outlaw 90 Service Manual, Page 146Get this manual
CVT SYSTEM 7To replace friction shoes, remove E-clips that retain the backing plateUse suitable tool to remove and install the return springs connecting the shoes, using care not to stretch the springs more than is necessary9Use vernier caliper to check the length of the compression springAt full extension, the measurement should be no less than 2.74" (69.7 mm)If out of specification, replace the springInspect the condition of the secondary clutch drive hubMeasure the inside diameter of the hub using caliper and compare to specificationIf either of these measurements exceeds the limit, replace the drive hub