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Snowmobile Polaris DEEP SNOW (2005 year). Manual - part 49

FRONT SUSPENSION

10.1

SUSPENSION ADJUSTMENT PROCEDURES

FRONT SUSPENSION SETUP AND ADJUSTMENTS

Spring preload is one of the adjustment options which affects ride.

Preload is the amount of pressure at which the spring is held. The lon-

ger the installed length of the spring, the less the amount of pre-load;

the shorter the installed length of the spring, the more the amount of

pre-load. An increase in IFS shock spring pre-load will result in an in-

crease in ski pressure.

To adjust front spring preload on threaded adjust models, grasp the

spring and turn in a clockwise direction (as viewed from the bottom

of the shock) to increase the preload. Turn in a counterclockwise di-

rection to decrease preload.

In the adjacent illustration, high preload and low preload positions are

depicted.

When adjusting, be sure springs on both the left and right sides of the

machine are at the same adjustment.

For the best ride the spring preload should be as low as possible. Set

the preload to use the full travel of the ski shock with occasional light

bottoming.

CAUTION:

If the plastic nut is unscrewed from the threaded body the nut will

break. Always leave one thread showing above the plastic nut or

the spring coils will stack, resulting in damage.

For the best ride the spring preload should be as low as possible. Set

the preload to use the full travel of the ski shock with occasional light

bottoming. To determine if your machine is using full travel, push the

shock jounce bumper down as far as it will go on the shock rod and

test ride the machine.

The bumper will move up on the rod in direct relation to the amount

of travel. For example, if the shock travel is full, the bumper will be

seated at the top of the shock.

Remove the existing spring and install the next highest rate

spring, or

Reduce the preload on the existing spring and change the shock
valving to obtain the desired effect. NOTE: Shock valving can

only be adjusted or changed on models equipped with Ryde FX,

Indy Select or Fox shocks.

Turning

clockwise in-

creases

preload

Low Preload

High Preload

Always leave

at least

one thread

showing

above nut

Push jounce

bumper down

as far as it

will go on

shock rod

Shock rod

FRONT SUSPENSION

10.2

IFS SHOCK SPRINGS

Part

Number

Total # of

Coils

Active

# of

Coils

Rate

(#/in)

Free

Length

Wire

Dia.

End Dia

O.D.”

Tabbed

Application

7041396-067

13.35

11.35

50.00

11.88”

.283”

1.89”

2.25”

2.82

Yes

Ryde FX

7041398-067

12.72

10.72

75.00

11.88”

.312”

1.89”

2.25”

2.88

Yes

Ryde FX

7041405-067

13.40

11.40

65.00

11.88”

.306”

1.89”

2.25”

2.82

Yes

Ryde FX

7041489-067

14.70

74/120

11.30”

.312”

1.89”

2.75

Yes

Fox

7041491-067

13.00

11.00

185.00

13.50”

.438”

1.90”

2.48”

3.60

Yes

7041520-067

10.60

8.60

90.00

10.50”

.283”

1.89”

2.57

7041528-067

17.57

74/160 var

11.30”

.306”

1.89”

2.53

Yes

7041529-067

19.39

50/140 var

11.30”

.283”

1.89”

2.50

Yes

7041530-067

14.42

70/105 var

10.50”

.283”

1.89”

2.50

Yes

7041549-067

9.17

140.00

10.75”

.331”

1.89”

2.25”

2.75

Yes

Ryde FX

7041550-067

8.29

120.00

10.80”

.306”

1.89”

2.25”

2.75

Yes

Ryde FX

7041551-067

9.55

100.00

10.75”

.306”

1.89”

2.25”

2.75

Yes

Ryde FX

7041552-067

9.09

80.00

10.75”

.283”

1.89”

2.25”

2.75

Yes

Ryde FX

7041553-067

11.46

60.00

11.33”

.283”

1.89”

2.25”

2.75

Yes

Ryde FX

7041554-067

9.09

80.00

10.75”

.283”

1.89”

2.75

Yes

Fox

7041571-067

10.40

8.40

70.00

10.50”

.263”

1.89”

2.53

7041573-067

9.28

160.00

10.00”

.331”

1.89”

2.91

Yes

Fox

7041574-067

10.32

140.00

10.25”

.331”

1.89”

2.91

Yes

Fox

7041575-067

10.36

120.00

11.42”

.331”

1.89”

2.87

Yes

Fox

7041576-067

9.55

100.00

10.80”

.306”

1.89”

2.86

Yes

Fox

7041591-067

12.79

80.00

12.25”

.306”

1.89”

2.75

Yes

7041598-067

9.71

105.00

9.33”

.312”

1.89”

2.25”

2.894

Yes

7041613-067

14.01

75.00

11.88”

.295”

1.89”

2.62

Yes

Fox

7041668-067

6.94

70.00

4.00”

.219”

1.89”

2.34

7041669-067

6.27

80.00

4.00”

.218”

1.89”

2.33

7041670-067

6.28

90.00

4.00”

.225”

1.89”

2.35

7041671-067

11.71

160.00

9.00”

.331”

1.89”

2.56

Fox

7041672-067

10.63

180.00

9.00”

.331”

1.89”

2.56

Fox

7041673-067

12.72

200.00

9.00”

.362”

1.89”

2.62

Fox

7041674-067

12.72

220.00

9.00”

.362”

1.89”

2.62

Fox

7041677-067

10.43

140.00

9.00”

.306”

1.89”

2.52

Fox

7041678-067

8.65

100.00

7.00”

.262”

1.89”

2.43

7041683-067

12.12

80.00

11.88”

.312”

1.89”

2.87

Yes

Ryde FX

7041698-067

5.84

100.00

4.00”

.225”

1.89”

2.35

Fox

7041699-067

5.75

120.00

4.00”

.235”

1.89”

2.37

Fox

7041701-067

10.57

120.00

9.00”

.295”

1.89”

2.49

Fox

7041820-067

5.98

140.00

4.00”

.250”

1.89”

2.43

Fox

7041821-067

5.91

160.00

4.00”

.262”

1.89”

2.49

Fox

7041826-067

9.19

160.00

7.00”

.306”

1.89”

2.54

Fox

7041826-067

8.85

180.00

7.00”

.312”

1.89”

2.54

Fox

7041828-067

9.61

200.00

7.00”

.331”

1.89”

2.59

Fox

7041829-067

8.92

220.00

7.00”

.331”

1.89”

2.59

Fox

FRONT SUSPENSION

10.3

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 re-

tainers. 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.

Coil Spring

Length

Installed

Length

FRONT SUSPENSION

10.4

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.

ADJUSTMENT

Locate the adjustment screw near the base of the shock. NOTE: This adjustment is easiest to make with the machine tipped

on its side.

WARNING

Be sure to shut off the fuel supply before tipping the machine to prevent fuel spillage and flooding of the carburetors.
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 accom-

plished with a mere 1/2 to 1 turns. There are approximately 3 full turns of adjustment available.

How to Adjust IFS

If the suspension is “bottoming,” tighten the compression screw clockwise in 1/2 turn increments until the bottoming stops.

Backing off 1/4 turn counter-clockwise at this point should give you the best possible ride ensuring use of the full travel of the

suspension. The opposite procedure should be used if the suspension is too stiff upon initial set-up.
If bottoming continues after the screw is turned in full clockwise, the compression spring should be adjusted with the threaded

adjustment collar. Back the screw out to the original starting position after the compression spring has been adjusted.
Riding conditions are ever changing. Keep in mind the compression damping adjustable screw can be adjusted at any time to

achieve the best possible ride in any condition.

NOTE:

Whenever shocks are replaced or reinstalled for any reason, the adjustment screw should be located toward the inside

of the suspension. Access to the adjuster is not possible if reversed. Fox Shocks should be installed with the charge fitting up.

Adjustment

Screw

Threaded Adjustment

Collar

Content .. 47 48 49 50 ..