1982 Ski-Doo Shop Manual, Page 187Get this manual
SECTION 03 TRANSMISSION SUB-SECTION 02 (DRIVE BELT)
To check tension Position reference rule on drive beltUsing wooden stick and fish scale, apply 6.8 kg (15 pounds) pressure on drive beltDeflection must be 32 mm (1 14")
TENSION ADJUSTMENT
NOTE: Prior to final adjustment, the drive belt must have break-in period time of one to two minutes of rotation on vehicle Elan model: adjust tension by moving chaincase
To do so, loosen the chaincase retaining "U" clamp and screw or unscrew the chaincase adjusting bolt,1
Using the belt tension tester PIN 414348200 (service tool)Chaincase retaining "U" clamp (loosen)
Deflection Distance (Read Up)