Content Source: 2021 PRO-RMK / RMK KHAOS / SKS 155 Owner’s Manual (9931274 Rev 01) > The Perfect Fit Chapter

IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle.Always follow the warnings and instructions in Owner's Manual.

Click the CONTENTS link above for the Table Of Contents, or download a full PDF of the Owner Manual in the Owner Support area of Polaris.com

Suspension Quick Set-Up Guide

The front and rear suspensions on your AXYS snowmobile are easy to adjust. Just remember three simple steps:
  1. Ride your snowmobile.
  2. Adjust the rear track shock spring to tune vehicle balance (ski pressure and weight transfer).
  3. Adjust shock clickers (if equipped) to tune ride quality (stiffer or softer ride).
Step 1: Ride your snowmobile.
Ride the snowmobile in various terrain to fully experience the existing suspension settings before making any adjustments.
Step 2: Adjust the rear spring to tune vehicle balance.
After riding, you should be able to determine if the snowmobile needs more or less transfer.
  • For more transfer, decrease the rear track spring preload.
  • For less transfer, increase the rear track spring preload.
If you prefer your snowmobile has lighter steering, decrease the rear track spring preload or increase the front track shock spring preload.
Step 3: Adjust shock clickers (if equipped) for ride quality.
For models equipped with monotube shocks, always adjust the rear track shock spring preload to enhance bottoming resistance.
For models with shock clickers, you can adjust the clickers to control bottoming and adjust ride comfort.
  • Turn a clicker counter-clockwise to decrease damping for a softer ride.
  • Turn a clicker clockwise to increase damping for a stiffer ride and less bottoming.
  • For models with high/low speed compression dampening, adjust the low-speed adjustment control first. If desired ride is not achieved, adjust the high-speed adjustment control to improve ride.
NOTICE
Always adjust the clicker at least one click below full stiff (full clockwise) or shock damage will occur.
Test ride the snowmobile and continue making spring and clicker adjustments until you achieve the perfect ride.

Shock Locations

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Rear track shock
Front track shock
Front (IFS) shocks

Shock Compression Damping

Shock compression damping is available for SKS, RMK KHAOS, and optional for PRO-RMK.
The primary adjustment for overall vehicle balance is RTS spring preload. Perform this adjustment first. After adjusting RTS spring preload to your satisfaction, compression damping adjustments can be made to control ride quality and bottoming resistance.
Compression damping can be adjusted on both the front and rear suspension. Make adjustments in 2-click increments, then test ride. When adjusting the front suspension, always adjust both clickers equally.
To stop bottoming of the front or rear suspension (stiffer ride), rotate the clicker(s) clockwise two clicks (as viewed from the top of the clicker), then test ride. Repeat the adjustment until bottoming stops and the desired ride quality is achieved.
For a more plush ride at the front or rear suspension, rotate the clicker(s) counter-clockwise two clicks, then test ride. Repeat the adjustment until the desired ride quality is achieved.

Front Suspension (IFS) Shock Adjustments

Always perform shock spring preload adjustments with the weight of the vehicle removed from the shock and with the shock at full extension.
To reset IFS clickers, rotate the clicker to full stiff, and then back off the same number of clicks for each shock.
For model equipped with high/low speed compression adjustment, see High/Low Speed Compression Adjustment.

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IFS SHOCK SPRING SETTINGS

IMPORTANT
The factory installed length of the IFS Shock Spring is equal to the maximum installed free length.

FACTORY SPRING

FACTORY INSTALLED LENGTH

MINIMUM INSTALLED LENGTH

PRO-RMK Monotube

10.25” (26 cm)

9.75” (24.8 cm)

RMK KHAOS

10.25” (26 cm)

9.75” (24.8 cm)

SKS/PRO-RMK w/Clicker

10.25” (26 cm)

9.75” (24.8 cm)

IFS Remote Reservoir Factory Clicker Settings

Model

Clicker Setting

(from full stiff)

PRO-RMK w/Clicker

10

RMK KHAOS

High–Speed: 4

Low-Speed: 6

SKS

10

Front Track Shock Spring Settings

Factory settings, combined with user adjustments to the rear track shock spring (RTSS), should be all that’s necessary to provide the best riding experience for most riders. The primary adjustment for overall vehicle balance is RTSS preload. Perform this adjustment first.
For model equipped with high/low speed compression adjustment, see High/Low Speed Compression Adjustment.

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Always perform shock spring preload adjustments with the weight of the vehicle removed from the shock and with the shock at full extension.
NOTICE
Never adjust spring preload to an installed length longer than the factory length or shorter than the minimum length as shown in the following chart. Damage to the suspension could result. When decreasing preload, make sure at least two turns of preload are holding the retainer against the spring.

Front Track Shock Factory Install Length

Factory Spring

Maximum Installed Length

Minimum Installed Length

PRO-RMK

8.375" (21.3 cm)

8.2" (20.8 cm)

RMK KHAOS

6.5” (16.5 cm)

6.25” (15.9 cm)

SKS

8.375" (21.3 cm)

8.2" (20.8 cm)

Front Track Shock Factory Clicker Settings

Model

Factory Clicker Setting (from full stiff)

RMK KHAOS

Low-Speed: 6

High–Speed: 4

Rear Track Shock Spring Settings

For riders who weigh 160-220 lbs. (73-100 kg), test ride at factory settings, then make fine-tuning adjustments. See the following initial RTS Shock Preload Settings table.

For riders outside the 160-220 lbs. (73-100 kg) weight range, adjust the factory-set preload to the following installed lengths as a starting point, then test ride before making fine-tuning adjustments. Do not exceed the minimum and maximum installed length requirements. See the following initial RTS Shock Preload Settings table.

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Always perform shock spring preload adjustments with the weight of the vehicle removed from the shock and with the shock at full extension. If adjustments to the factory-installed springs are not sufficient for riders over 300 lbs. (136 kg), optional stiffer springs are available. Your POLARIS dealer can assist.
For model equipped with high/low speed compression adjustment, see High/Low Speed Compression Adjustment.
NOTICE
Do not install accessory bogie wheels on the inside of the rail beams if your model is equipped with a remote reservoir rear track shock or damage will occur. The rail scratchers must first be removed as they interfere with the accessory bogie wheels.

Rear Track Shock Factory Clicker Settings

Model

Clicker Setting (from full stiff)

PRO-RMK w/clicker

13

RMK KHAOS

High–Speed: 4

Low-Speed: 6

SKS

13

Initial RTS Shock Preload Settings

(Measure spring length with suspension off the ground)

Rider Weight

Model

Factory Installed Length

Minimum Installed Length

For Factory-Installed Springs

  

< 160 lbs.

< 73 kg

SKS/PRO-RMK

10.75"

27.3 cm

9.8"

(24.9 cm)

RMK KHAOS

10.375"

26.3 cm

9.8"

(24.9 cm)

PRO-RMK 174

10.5”

26.7 cm

9.625"

(24.4 cm)

160-220 lbs

73-100 kg

SKS/PRO-RMK

*10.5"

*26.7 cm

9.8"

(24.9 cm)

RMK KHAOS

*10.25"

*26 cm

9.8"

(24.9 cm)

PRO-RMK 174

*10.25”

*26 cm

9.625"

(24.4 cm)

220-280 lbs.

100-127 kg

SKS/PRO-RMK

10.125"

25.7 cm

9.8"

(24.9 cm)

RMK KHAOS

10.125"

25.7 cm

9.8"

(24.9 cm)

PRO-RMK 174

9.875”

25.1 cm

9.625"

(24.4 cm)

280-340 lbs.

127-154 kg

SKS/PRO-RMK

9.8"

24.9 cm

9.8"

(24.9 cm)

RMK KHAOS

10"

25.4 cm

9.8"

(24.9 cm)

PRO-RMK 174

9.625”

24.4 cm

9.625"

(24.4 cm)

*Factory Setting

For Optional 250 lb./in. Stiff Springs (see your dealer)

250-300 lbs.

113-136 kg

ALL

10.25"

26 cm

10"

(25.4 cm)

300-350 lbs.

136-159 kg

ALL

10"

25.4 cm

Rear Torsion Spring Kits

All AXYS and MATRYX vehicles are equipped with standard stock rear track suspension springs. To customize your ride, rear torsion spring kits can be installed to accommodate your particular total rider weight range.
Kit Description Part Number Weight Range – Lbs (Kg)
Factory-installed Stock Spring N/A 140-260 lb (64-118 kg)
129/137 Light Duty 2884973 0-180 lb (0-82 kg)
144/146 Light Duty 2884974 0-180 lb (0-82 kg)
129/137 Heavy Duty 2884975 220-350 lb (100-159 kg)
144/146 Heavy Duty 2884976 220-350 lb (100-159 kg)
129/137 Extra Heavy Duty 2884977 310-425 lb (141-193 kg)

High/Low Speed Compression Adjustment


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Low-Speed Compression Adjustment (Black)

To adjust the low-speed compression dampening, do the following:
  1. Turn the inside clicker clockwise to increase compression damping.
  2. To decrease high speed compression damping, turn the inside clicker counter-clockwise.

High-Speed Compression Adjustment (Red)

To adjust the high-speed compression dampening, do the following:
  1. Turn the outside clicker clockwise to increase compression damping.
  2. To decrease high speed compression damping, turn the outside clicker counter-clockwise.

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