1983 Ski-Doo Shop Manual, Page 137Get this manual
SECTION 03 TRANSMISSION SUB-SECTION 02 (DRIVE BELT)
For Alpine model:To remove belt from pulleys, follow the Elan procedure- To remove belt from vehicle: A) Remove the two bolts holding brake support to the frame
DRIVE BELT DEFLECTION MEASUREMENT
NOTE: The drive belt deflection measurement must be performed each time new drive belt is installed
NOTE: To obtain an accurate drive belt deflection measurement, it is suggested to allow break-in period of 50 km (30 miles) to the drive belt
Before checking the belt deflection, ensure vehicle has its proper belt number and correct belt width(Refer to the application chart, at the beginning of this subsection) To obtain maximum vehicle performance, the belt tension must be adjusted to 6.8 kg (15 pounds) with deflection of 32 mm (1 14")To check tension