10.8
FRONT SUSPENSION/STEERING
SPRINGS
Two types of springs are employed in Polaris suspensions, coil
springs and torsion springs. Following is some of the
terminology used when referring to coil springs.
• Free length - the length of a coil spring with no load
applied to the spring
• Installed length - the length of the spring between the
spring retainers. If the installed length of the spring is
less than the free length, it will be pre-loaded.
• Spring rate - the amount of force required to compress
a coil spring one inch. For example, if 150 pounds of
force are required to compress a spring 1 inch, the
spring rate would be 150 #/in.
• Straight rate spring - the spring requires the same
amount of force to compress the last one inch of travel
as the first one inch of travel. For example, if a 150 #/
in. spring requires 150 pounds of force to compress it
one inch, 300 pounds of force would compress it two
inches, 450 pounds of force would compress it three
inches, etc.
• Progressively wound spring - the rate of the spring
increases as it is compressed. For example, a 100/200
#/in. rate spring requires 100 pounds of force to
compress the first one inch, but requires 200 additional
pounds to compress the last one inch.
When a bump is encountered by the suspension, the force of
the bump compresses the spring. If the force were 450 pounds,
a 100 #/in. spring would compress 4.5 inches. A 150 #/in.
spring would only compress 3 inches. If the suspension had 4
inches of spring travel the 100 #/in. spring would bottom out,
while the 150 #/in. spring would have one inch of travel
remaining.
COMPRESSION DAMPING ADJUSTABLE
SHOCKS
Snowmobiles equipped with the Indy Select or Ryde FX
shocks allow the driver to make adjustments to the
compression valving by turning the screw located near the
base of the shock.
Locate the adjustment screw near the base of the shock.
By turning the screw clockwise (a small screwdriver or dime
work well), the compression valving is increased, stiffening
the ride. To soften the ride, reduce the compression by turning
the screw counter-clockwise. A great deal of ride performance
is accomplished with a mere 1/2 to 1 turns. There are
approximately 3 full turns of adjustment available.
If the suspension is "bottoming," tighten the compression
screw clockwise in 1/2 turn increments until the bottoming
7041701 10.57 120 9” .295” 1.89” 2.49 No
7041820 5.98 140 4” .250” 1.89” 2.43 No
7041821 5.91 160 4” .262” 1.89” 2.49 No
7041826 9.19 160 7” .306” 1.89” 2.54 No
7041826 8.85 180 7” .312” 1.89” 2.54 No
7041828 9.61 200 7” .331” 1.89” 2.59 No
7041829 8.92 220 7” .331” 1.89” 2.59 No
7041927 16.15 68/160 13” .295” 1.89” 2.54 Yes
7041950 13.80 68/160 11.57” .331” 1.89” 3.125 Yes
7042052 11.7 110 12 0.343 1.87 3 NO
7042074 11.625 90/180 Var 10.65 0.343 1.89 3.2 YES
7042187 13.76 68/160 12.55 0.343 1.89 3.18 YES
7042195 14 90/180 Var 13 0.362 1.89 3.2 YES
7042263 80/110 Var 10.78 0.331 1.89 3.25 YES
7042314 10.64 75 10.01 0.281 1.89 2.71 YES
7042315 10.89 55 9.85 0.262 1.89 2.66 YES
Table 10-1: IFS Shock Springs
Part
Number
Total # of
Coils
Rate #/in)
Free
Length
Wire Via. I.D." O.D.” Tabbed?
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