1999 Ski-Doo Factory Shop Manual Volume One, Page 150Get this manual
Subsection 07
Section 04 ENGINE (AXIAL FAN COOLING SYSTEM)
Belt deflection must be according to the following specifications:
ENGINE TYPE 377 443 and 503 BELT DEFLECTION 8.5 mm (1132 in) 9.5 mm (38 in) FORCE APPLIED kg (11 lb)
To adjust deflection tension, add or remove shim(s) no15 between pulley halves nos14 and 16Install excess shim(s) between distance sleeve no13 and half pulley no14 (housing side)2 1
A03C24A
TORQUE FAN NUT USING FAN HOLDER TOOL
Finalizing Reassembly
Reinstall rewind starter