1989 Ski-Doo Repair Manual, Page 467Get this manual
Sub-section 06
Section 06 SUSPENSION (MONOSHOCK PRS SUSPENS'ON)
CAUTION: There must be two thrust washers between spring and adjuster ring on front shockIf missing, install thrust washers IP IN 503 0887 00)
before attempting to adjustThe front shock of the rear suspenSion should be removed for adjustmentFront shock absorber has position ring located at the bottom of the shock Rear shock has position ringSpring preload may be increased or decrcasod by turning the ringFit the key on the shock adjuster ring and tum clockwise for stiffest or counterclockwise for softestSurface cO:Jdili-on
The shock absorber preload is adjusted by turning the adjuster ringFRONT SHOCK SPRING