1999 Ski-Doo Factory Shop Manual Volume One, Page 68Get this manual
Section 03 TROUBLESHOOTING Subsection 04 (TRANSMISSION AND BRAKE SYSTEMS)
SYMPTOM CONDITION TestInspection
LOOSENESS IS FELT IN DRIVE SYSTEM WHEN ACCELERATINGDECELERATINGNORMAL USE1Check drive chain tensionaDrive chain is too looseAdjust2Check radial play of driven pulley (aluminum frame models)aWorn key or keyway (splines on models with RER)Replace
SYMPTOM CONDITION TestInspection