1997 Ski-Doo Factory Shop Manual Volume One, Page 131Get this manual
Section 04 TRANSMISSION Sub-Section 03 (DRIVE PULLEY)
GENERAL
Some drive pulley components (return spring, ramp) can be changed to improve vehicle performance in high altitude regionsThe High Altitude Technical Data booklet (P484 0624 00 and 484 0545 00 for binder) gives information about calibration according to altitudeCAUTIONSuch modifications should only be performed by experienced mechanics since they can greatly affect vehicle performanceVerify spring specifications before installationDo not only refer to the spring color codeNOTETRA clutch stands for Total Range Adjustable clutchWARNINGAny drive pulley repairs must be performed by an authorized Bombardier snowmobile dealer, or other such qualified personSub-component installation and assembly tolerances require strict adherence to procedures detailed
WARNINGNever use any type of impact wrench at drive pulley removal and installationRemove retaining screwTo remove drive pulley ass'y andor fixed half from engine, use puller (P529 0079 00)CAUTIONThese pulleys have metric threadsDo not use imperial threads pullerAlways tighten puller by hand to ensure that the drive pulley have the same type of threads (metric vs imperial) prior to fully tighten