Content .. 71 72 73 74 ..

Snowmobile Polaris High Performance (2001 year). Manual - part 73

REAR SUSPENSION/TRACK/TRACTION

7.3

2001 Suspension Torque Specifications

3/8

〉

suspension mounting bolts

35 - 40 ft. lbs. (48 - 55 Nm)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7/16

〉

suspension mounting bolts (EDGE PRO X)

55 - 60 ft. lbs. (76 - 83 Nm)

. . . . . . . . . . . . . . . .

Shock rod bolts (do not over torque) (X--10)

12 ft. lbs. (16.6 Nm)

. . . . . . . . . . . . . . . . . . . . .

Shock rod bolts (do not over torque) (EDGE PRO X)

25 ft. lbs. (34.6 Nm)

. . . . . . . . . . . . .

Xtra-10 and Edge Rear Track Shock Upper Pivot Torque

25 ft.lbs (34.6 Nm)

. . . . . . . . .

Shock rod bolts (do not over torque) EDGE

35 ft. lbs. (48.4 Nm)

. . . . . . . . . . . . . . . . . . . . .

* Shock rods must pivot freely after torquing

NOTE: 2000 Bogie wheel is 5.35” and 2001 Bogie wheel is 5.62”

2001 Rear Suspension Specifications

Model

Rear

Suspension

Front
Track

Shock

Front
Track

Shock

(Type)

Front
Track

Shock

Spring

PN*

Front
Track

Shock

Spring

Rate

(lb./in.)

Rear

Track

Shock

Rear

Track

Shock

Desc.

Torsion Spring

Part Number*

Left / Right

Torsion Spring

Diameter / Angle

(Rear Shock

Spring Rate)

XCF SP

Edge Pro X

7041992

Arvin IFP

7042050

170#/in

7041991

Arvin IFP

w/res

7041629/7041630

.359(sq)



440/600 Edge
Pro X

Edge Pro X

7041973

Arvin IFP

7042050

170#/in

7041974

Arvin IFP

w/res

7041629/7041630

.359(sq)



500 XC SP

Edge

7041847

FOX IFP

7041914

160/var

7041846

Pos. Sen.

7041942/7041943

.375(sq)



600 XC SP

Edge

7041847

FOX IFP

7041914

160/var

7041846

Pos. Sen.

7041942/7041943

.375(sq)



700 XC SP

Edge

7041847

FOX IFP

7041914

160/var

7041846

Pos. Sen

7041942/7041943

.375(sq)



800 XC SP

Edge

7041847

FOX IFP

7041914

160/var

7041846

Pos. Sen

7041942/7041943

.375(sq)



600 RMK136

Xtra-Lite 136

7041766

Nitrex

7041870

190#/in

7041757

Select

7041856/7041857

.359(sq)



700 RMK136

Xtra-Lite 136

7041766

Nitrex

7041870

190#/in

7041757

Select

7041856/7041857

.359(sq)



800 RMK144

Xtra-Lite 136

7041766

Nitrex

7041870

190#/in

7041909

Select

7041856/7041857

.359(sq)



800 XCR

Xtra 10

7041951

FOX IFP

7041253

200/var

7041947

Elec Adj

7041629/7041630

.359(sq)



*All springs shipped as service parts are black. You must add a suffix of “-067” to spring part number when ordering

2000 Rear Suspension Specifications

Model

Rear

Suspension

Front
Track

Shock

Front
Track

Shock

(Type)

Front
Track

Shock

Spring

PN*

Front
Track

Shock

Spring

Rate

(lb./in.)

Rear

Track

Shock

Rear

Track

Shock

Desc.

Torsion Spring

Part Number*

Left / Right

Torsion Spring

Diameter / Angle

(Rear Shock

Spring Rate)

XCF SP

Edge

7041905

FOX IFP

7041916/

7041822

150/225

#/in

7041906

FOX IFP

w/res

7041629/7041630

.359(sq)



440 XC SP

Edge

7041907

FOX IFP

7041916/

7041822

150/225

#/in

7041906

FOX IFP

w/res

7041895/7041896

.375(sq)



500 XC SP

Xtra-10

7041810

FOX IFP

7041508

190#/in

7041728

Pos. Sen.

7041629/7041630

.359(sq)



600 XC SP

Xtra-10

7041810

FOX IFP

7041508

190#/in

7041728

Pos. Sen.

7041629/7041630

.359(sq)



700 XC SP

Xtra-10

7041810

FOX IFP

7041508

190#/in

7041728

Pos. Sen

7041629/7041630

.359(sq)



600 RMK

Xtra-Lite 136

7041766

Nitrex

7041870

190#/in

7041757

Select

7041856/7041857

.359(sq)



700 RMK

Xtra-Lite 136

7041766

Nitrex

7041870

190#/in

7041757

Select

7041856/7041857

.359(sq)



800 RMK

Xtra-Lite 136

7041766

Nitrex

7041870

190#/in

7041757

Select

7041856/7041857

.359(sq)



800 XCR

Xtra 10

7041808

FOX IFP

7041253

200/var

7041809

FOX IFP

7041629/7041630

.359(sq)



*All springs shipped as service parts are black. You must add a suffix of “-067” to spring part number when ordering

REAR SUSPENSION/TRACK/TRACTION

REAR SUSPENSION/TRACK/TRACTION

7.4

Rear only Xtra Travel Arm orientation

Tunnel Line

REAR SUSPENSION/TRACK/TRACTION

REAR SUSPENSION/TRACK/TRACTION

7.5

Rear Suspension Operation

The primary function of the rear suspension is to provide a comfortable ride in all types of riding conditions. It
separates the rider from the ground, while allowing for complete vehicle control. The rear suspension also must
provide weight transfer and maintain track tension.

The rear suspension has many adjustable features for fine tuning to achieve optimum comfort. The suspension
can be adjusted to suit rider preference and deliver excellent performance for a given set of conditions. It should
be noted, however, that suspension adjustments involve a compromise or trade off. A machine set up to perform
well in the moguls would not suit the preference of a groomed trail rider.

Weight Transfer

The shifting of weight from the
skis to the track is called weight
transfer. As engine torque is ap-
plied to the drive axle the torque
is transferred to the track, pulling
it forward. This energy also tries
to pull the suspension forward.
The front torque arm reacts to
this force by pushing down on
the front of the track, in effect ap-
plying more weight to the front of
the track and reducing the
weight on the skis. It is important
to note that energy used to lift
the front of the machine is not
available to push the vehicle for-
ward.

Changing the angle of the front torque arm changes the suspension’s reaction to the force. Adjusting the length
of the limiter strap will change the front torque arm angle. Shortening the strap limits the extension of the front
of the suspension; reducing the angle of the torque arm and increasing ski pressure during acceleration. Length-
ening the strap allows the front of the suspension to extend further; increasing the angle of the torque arm and
decreasing ski pressure during acceleration. Limiter strap adjustment has a great affect on weight transfer. Limit-
er straps only affect ski pressure durring acceleration.

Front track shock spring preload also affects weight transfer. A stiffer spring and/or more preload on the spring
transfers more weight to the track. A softer spring and/or less preload keeps more weight on the skis. Keep your
riding application in mind when choosing springs and setting spring preload. Soft springs/preload will increase
ski pressure, but may bottom out. Stiff springs/preload will provide more track pressure (reduced ski pressure),
but may result in a less comfortable ride.

During acceleration, the rear of the suspension will compress and the IFS will extend, pivoting the machine about
the front torque arm. Because of this pivoting effect, rear spring and spring preload also have some effect on
weight transfer. Softer rear springs, or less preload, allow more weight transfer to the track and reduce ski pres-
sure. Stiffer rear springs, or increased preload, allow less weight transfer to the track and increase ski pressure.
The main function of the rear torque arm is to support the weight of the vehicle and rider, as well as to provide
enough travel to absorb bumps and jumps.

Shock valving also has an effect on weight transfer. Refer to shock tuning information in this chapter.
Scissor stops also affect weight transfer. See scissor stop information in this chapter.

REAR SUSPENSION/TRACK/TRACTION

REAR SUSPENSION/TRACK/TRACTION

7.6

Springs

Two types of springs are employed in Polaris suspen-
sions, 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 ap-
plied 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.

NOTE: All springs must have preload or damage to the
retainers and shock may occur.

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.

Dual Rate Springs - See page 7.6 for dual spring rate information.

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.

Torsion springs are much like coil springs, although
shaped differently. The rate of the torsion spring is con-
trolled by the free opening angle, the installed opening
angle, the wire diameter of the spring, and the number of
coils.

Coil Spring
Length

Installed
Length

Torsion Spring

Load reduces
opening angle

Load

Wire
Dia.

REAR SUSPENSION/TRACK/TRACTION

Content .. 71 72 73 74 ..