Snowmobile Polaris Two Stroke (2007 year). Instruction - part 51

 

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Snowmobile Polaris Two Stroke (2007 year). Instruction - part 51

 

 

8.7

FRONT SUSPENSION & STEERING

8

FRONT SUSPENSION ADJUSTMENT PROCEDURES

SET UP 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
longer 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 increase 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 direction 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.

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 that can be serviced.

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.

8.8

FRONT SUSPENSION & STEERING

IFS SHOCK SPRINGS

IFS Shock Springs

 P

ART

 

N

UMBER

 

 T

OTAL

 # 

OF

 

C

OILS

 

 R

ATE

 #/

IN

 F

REE

 

L

ENGTH

 

 W

IRE

 V

IA

I.D."

 O.D.” 

 T

ABBED

7041261

13

105

10.25

0.312

1.84

2.6

NO

7041396

 13.35 

50

 11.88 

.283 

 1.89 

 2.82 

 Yes 

7041398

 12.72 

75

 11.88 

.312 

 1.89 

 2.88 

 Yes 

7041405

 13.40 

65

 11.88  

 .306  

 1.89  

 2.82  

 Yes  

7041489

 14.70  

 74/120  

 11.30  

 .312  

 1.89  

 2.75  

 Yes  

7041491

13

185

 13.50  

 .438  

 1.90  

 3.60  

 Yes  

7041520

 10.60  

90

 10.50  

 .283  

 1.89  

 2.57  

 No  

7041528

 17.57  

 74/160 var  

 11.30  

 .306  

 1.89  

 2.53  

 Yes  

7041529

 19.39  

 50/140 var  

 11.30  

 .283  

 1.89  

 2.50  

 Yes  

7041530

 14.42  

 70/105 var  

 10.50  

 .283  

 1.89  

 2.50  

 Yes  

7041549

 9.17  

140

 10.75  

 .331  

 1.89  

 2.75  

 Yes  

7041550

 8.29  

120

 10.80  

 .306  

 1.89  

 2.75  

 Yes  

7041551

 9.55  

100

 10.75  

 .306  

 1.89  

 2.75  

 Yes  

7041552

 9.09  

80

 10.75  

 .283  

 1.89  

 2.75  

 Yes  

7041553

 11.46  

60

 11.33  

 .283  

 1.89  

 2.75  

 Yes  

7041554

 9.09  

80

 10.75  

 .283  

 1.89  

 2.75  

 Yes  

7041571

 10.40  

70

 10.50  

 .263  

 1.89  

 2.53  

 No  

7041573

 9.28  

160

 10  

 .331  

 1.89  

 2.91  

 Yes  

7041574

 10.32  

140

 10.25  

 .331  

 1.89  

 2.91  

 Yes  

7041575

 10.36  

120

 11.42  

 .331  

 1.89  

 2.87  

 Yes  

7041576

 9.55  

100

 10.80  

 .306  

 1.89  

 2.86  

 Yes  

7041591

 12.79  

80

 12.25  

 .306  

 1.89  

 2.75  

 Yes  

7041598

 9.71  

105

 9.33  

 .312  

 1.89  

 2.894  

 Yes  

7041613

 14.01  

75

 11.88  

 .295  

 1.89  

 2.62  

 Yes  

7041668

 6.94  

70

 4  

 .219  

 1.89  

 2.34  

 No  

7041669

 6.27  

80

 4  

 .218  

 1.89  

 2.33  

 No  

7041670

 6.28  

90

 4  

 .225  

 1.89  

 2.35  

 No  

7041671

 11.71  

160

 9  

 .331  

 1.89  

 2.56  

 No  

7041672

 10.63  

180

 9  

 .331  

 1.89  

 2.56  

 No  

7041673

 12.72  

200

 9  

 .362  

 1.89  

 2.62  

 No  

7041674

 12.72  

220

 9  

 .362  

 1.89  

 2.62  

 No  

7041677

 10.43  

140

 9  

 .306  

 1.89  

 2.52  

 No  

7041678

 8.65  

100

 7  

 .262  

 1.89  

 2.43  

 No  

7041683

 12.12  

80

 11.88  

 .312  

 1.89  

 2.87  

 Yes  

7041698

 5.84  

100

 4  

 .225  

 1.89  

 2.35  

 No  

7041699

 5.75  

120

 4  

 .235  

 1.89  

 2.37  

 No  

7041701

 10.57  

120

 9  

 .295  

 1.89  

 2.49  

 No  

8.9

FRONT SUSPENSION & STEERING

8

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.

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

8.67

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

IFS Shock Springs

 P

ART

 

N

UMBER

 

 T

OTAL

 # 

OF

 

C

OILS

 

 R

ATE

 #/

IN

 F

REE

 

L

ENGTH

 

 W

IRE

 V

IA

I.D."

 O.D.” 

 T

ABBED

8.10

FRONT SUSPENSION & STEERING

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 installed differently.

 

 

 

 

 

 

 

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