Ski-Doo FORMULA 500 1997, Shop Manual

Page: 257 / 352

Section 06 REAR SUSPENSION
Sub-Section 02 (SC-10 SUSPENSIONS (ALL VERSIONS))
06-02-14
NOTE: The following reference numbers are
referring to above illustration.
After the new or replacement shim pack has been
selected, reassemble in the reverse order of dis-
assembly. Torque piston nut
no. 1 to 11-13 N•m
(96-108 lbf• in ).
Washer (s) no. 2 are used as required to allow ad-
equate threads for damper rod nut.
Install valve stopper no. 3 with its round edge
down.
NOTE: Rebound shim stack no. 4 must not
reach into threads of damper shaft. Washer
no. 2 under damper shaft nut is used to prevent
damper shaft nut from bottoming on shock rod
shoulder.
Rebound damping options from Bombardier in-
clude a x-country kit.
Rebound
Approximately 0.203 mm (.008 in) clearance no. 4
must be allowed between shim stack no. 5 and
valve stopper no. 3 .
Whenever tuning for more rebound damping al-
ways use 26 mm (1.02 in) shims against piston to
properly close piston orifice holes. More thin
shims will offer less damping than a few thick
shims of the same overall thickness.
Tuning for less damping it is important to remem-
ber, never use less than 3
×
26 mm (1.02 in) shims
against piston. This will guard against fatigue
breakage.
Piston no. 6 options include 4 pistons, 0, 2, 4, 6,
slits for rebound damping bleeds. These bleed
slits will offer a damping variation to the function
of the shims.
Compression
Whenever tuning for more compression damping
always use 30 mm (1.18 in) shims
no. 7 against
piston to properly close piston orifice holes. Two
thin shims will offer less damping than one thick
shims of the equal thickness.
Tuning for less damping it is important to re-
member, never use less than 3 shims against
piston. This will guard against fatigue breakage.
One 0.114 mm spacer washers no. 8 minimum (2
or more recommended) should always be used
between shim stack and valve stopper washer.
This will allow needed room for the valve shims to
function.
Compression valve stop no. 9 must have slots
facing shim stack.
General Information
Over damping is a common error by suspension
tuners. When operating an over-damped snow-
mobile, you will experience a packing of the sus-
pension. The over-damping will not allow the
suspension to recycle to full extension after an ob-
stacle compresses the suspension. This situation
will eventually bottom the suspension (pack up)
and not allow it to cycle properly.
Under damping can result in insufficient or uncon-
trolled damping. This condition would allow the
damper to move freely (unrestricted) in both di-
rections. The most noticeable symptom will be a
bouncing of the snowmobile when encountering
bumps.
NOTE: Careful inspection of the damping
shims should be completed. Any bent shims
must be replaced to insure redamping (valving)
will be in perfect order.
Under damping symptoms can be mistaken for an
aerated shock due to low gas pressure. Although
it is exceptional, the gas pressure should be
checked.
-
CAUTION
The damper rod nut no. 1 can only be re-
used 4 times, then, must be replaced. Do not
substitute this part for non — O.E.M.
A06F0YA
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