2003 Ski-Doo REV Series Factory Shop Manual, Page 84Get this manual
Section 03 TROUBLESHOOTING Subsection 04 (TRANSMISSION AND BRAKE SYSTEMS)
SYMPTOM CONDITION TESTINSPECTION
BELT "FLIP-OVER" AT HIGH SPEEDNORMAL USE1Check pulley alignmentaPulley misalignmentAlign pulley according to specifications (refer to TECHNICAL DATA)2Check drive belt identification numberaWrong type of beltReplace with an appropriate drive belt
A00D0IY