2003 Ski-Doo REV Series Factory Shop Manual, Page 80Get 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 lowAdjust according to specifications (refer to TECHNICAL DATA) or replace spring2Refer to VIBRATIONS COMING FROM DRIVEN PULLEY and check items listed3Check drive pulley bushings (cleanliness, wear, etcaBushings stick to fixed half pulley shaftClean or replace
SYMPTOM CONDITION TESTINSPECTION
IN REVERSE ENGINE FAILS 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 torque rod is resting against engineCheck engine mounts2Check for reverse sliding shoesaSliding shoes are worn or missingReplace sliding shoes3Check springaSpring is weak or insufficient tensionReplace spring