2002 Bombardier Quest 650XT Service Manual, Page 51Get this manual
Section 03 ENGINE Subsection 02 (TROUBLESHOOTING)
SYMPTOM CONDITION TestInspection
PULLEYS DO NOT DOWN SHIFT PROPERLYNORMAL USE1Refer to VIBRATIONS COMING FROM DRIVEN PULLEY and check items listed2Check drive pulley bushings (cleanliness, wear, etcaBushings stick to fixed half pulley shaftClean or replace3Check driven pulley spring tensionaSpring tension is too weakReplace
SYMPTOM CONDITION TestInspection
BELT GLAZED EXCESSIVELY OR HAVING BAKED APPEARANCENORMAL USE1Check if drive pulley bushings are wornaInsufficient pressure on belt sidesReplace drive pulley halves2Check condition of drive pulley fixed half shaftaRusted drive or driven pulley shaftsClean shaft with fine steel wool3Check if pulley halves are clean