2001 Ski-Doo Factory Shop Manual Volume Three, Page 74Get this manual
Section 03 TROUBLESHOOTING Subsection 04 (TRANSMISSION AND BRAKE SYSTEMS)
SYMPTOM CONDITION TestInspection
PULLEYS DO NOT DOWN SHIFT PROPERLYNORMAL USE1Check driven pulley spring tensionaSpring tension is too weakAdjust according to specifications (refer to TECHNICAL DATA)2Refer to VIBRATIONS COMING FROM DRIVEN PULLEY and check items listed3Check drive pulley bushings (cleanliness, wear, etcaBushings stick to fixed half pulley shaftClean or replace4Check driven pulley spring tensionaSpring tension is too weakReplace
SYMPTOM CONDITION TestInspection
IN REVERSE ENGINE BOGS AND DRIVEN PULLEY OPENS TOO FAST (DRIVE BELT IS LOW IN DRIVEN PULLEY)NORMAL USE1Check pulley distance and alignmentaImproper adjustmentAdjust according to specifications (refer to PULLEY DISTANCE AND ALIGNMENT) and make sure that engine stopper is resting against engine