2003 Ski-Doo ZX Series Factory Shop Manual, Page 81Get this manual
Section 03 TROUBLESHOOTING Subsection 04 (TRANSMISSION AND BRAKE SYSTEMS)
SYMPTOM CONDITION TESTINSPECTION
ENGINE MAXIMUM RPM IS TOO HIGH AND TOP SPEED IS NOT REACHEDNORMAL USE1Check items 1, and of THE SNOWMOBILE ACCELERATES SLOWLY, ESPECIALLY FROM STANDING START2Check driven pulley spring tensionaSpring tension is too stiffAdjust according to specifications (refer to TECHNICAL DATA)3Check position of the calibration screws(TRA drive pulley) aSelected numbers are too highAdjust according to specifications (refer to TECHNICAL DATA)4Refer to VIBRATIONS ORIGINATING FROM DRIVE PULLEY and check items listed5Check the driven pulleyaDriven pulley does not open completelyClean, readjust or replace driven pulley