1985 Ski-Doo snowmobile Service Manual, Page 239Get this manual
Section 03
TRANSMISSION
(DRIVE BELT)
Sub-section 02
Threaded bushing
AOQ4003010
DEFLECTION ADJUSTMENT
Elan model
The proper drive belt deflection is obtained by chaincase movementTo do so, loosen the chaincase retaining U-clamp and screw or unscrew the chaincase adjusting bolt
Safari (all), Formula 5S, SP, Mirage III
Drive belt deflection is adjusted with the movement of the chaincasecountershaft assemblyTo do so, loosen the chaincase retaining nuts; unlock the countershaft support attachment and screw or unscrew to adjust distance between pulleys