2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 372Get this manual
Section 07 TRANSMISSION Subsection 02 (DRIVE PULLEY)
GENERAL
Some drive pulley components (return spring, ramp) can be changed to improve vehicle performance in high altitude regionsA service bulletin will give information about calibration according to altitudeCAUTION: Such 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 codeNOTE: TRA drive pulley stands for Total Range Adjustable drive pulley
WARNING
Any drive pulley repairs must be performed by an authorized BRP snowmobile dealerSub-component installation and assembly tolerances require strict adherence to procedures detailedA32D26A
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1TRA IV Sliding half tower