AD Boivin 2002 Snow Hawk Manual page 58

REAR SUSPENSION, SHOCKS AND TRACK 12 - 11
REBOUND
Leave a play of about 0.203 mm (0.008 in) between the stack of
shims and the lock nut.
When adjusting the shock absorber to increase the rebound
damping, always use shims measuring 26 mm (1.02 in) against
the piston to close the piston openings well. Even though the
total thickness is the same, a large number of thin shims offer
less damping effect than a small number of thick shims.
When adjusting the shock absorber to decrease the rebound
damping, always use at least 3 shims measuring 26 mm (1.02
in) against the piston to prevent any breakage that could be
caused by wear.
There are 4 kinds of pistons whose number of grooves varies
between 0, 2, 4, and 6 according to the rapidity of the rebound.
These grooves offer variations in the damping in relation to the
shims.
COMPRESSION
When adjusting the shock absorber to increase the compression
damping, always use shims measuring 30 mm (1.18 in) against
the piston to close the piston openings well. Even though the
total thickness is the same, 2 thin shims offer less damping than
one thick shim.
When adjusting the shock absorber to decrease the
compression damping, always use at least 3 shims against the
piston to prevent any breakage that could be caused by wear.
Always use at least one washer measuring 0.114 mm (the use
of 2 or more is recommended) between the stack of shims and
the lock nut washer so that the shims will have enough space to
work.
During compression the grooves of the lock nut must face the
stack of shims.