Snowmobile Polaris 600 Fusion (2006 year). Instruction - part 13

 

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Snowmobile Polaris 600 Fusion (2006 year). Instruction - part 13

 

 

52

THE PERFECT FIT

FAST M-10 Rear Suspension Adjustments

The M-10 suspension has been designed to be very sensitive to rider 

weight.  Changes in rider weight of 25 lbs. (11 kg) or more might 

require appropriate changes in settings.  The following information has 

been compiled to assist you in tuning your M-10 suspension to its maxi-

mum potential and achieve the best possible ride.  Please take the time 

to read and understand all the possible adjustments available with this 

suspension.

Static Sag and Ride Height Settings

Static sag describes the difference in height of the rear bumper from the 

suspension's fully extended position to its loaded height, with the rider 

seated on the snowmobile. Too much sag will result in bottoming, and 

too little sag will result in reduced rider comfort.

Sag is used to control ride quality and rebound travel.  On this suspen-

sion, sag is controlled by two settings, the full range adjuster (FRA) 

position and the rear spring preload.

1. To check sag, raise the rear bumper until the suspension is fully 

extended (the rear shock will not extend any further).  Measure the 

distance from the ground to the bottom of the bumper (dimension 

X) as shown in the illustration.  Record the measurement.

2. Have the rider sit on the snowmobile and bounce up and down on 

the seat a few times to set in the suspension. While the rider remains 

seated, measure the distance from the ground to the top of the 

bumper (dimension Y) and record it.

53

THE PERFECT FIT

FAST M-10 Rear Suspension Adjustments

Static Sag and Ride Height Settings

3. Subtract Y from X and you will have the SAG setting (X - Y = sag 

setting.  Example: 21 - 17 = 4).

NOTE: The ideal amount of sag recommended for the FAST M-10 rear 

suspension is 3-4 inches (8-10 cm).

If the measured sag is incorrect, adjust the FRA position and rear spring 

preload.  See pages 54-55.

X

Y

54

THE PERFECT FIT

FAST M-10 Rear Suspension Adjustments

Static Sag and Ride Height Settings

FRA Position

The FRA setting is the primary rear suspension adjustment. It will have 

the MOST effect on the rear suspension performance.  To adjust the 

FRA:

1. Refer to the initial set-up reference chart (located under the hood of 

your snowmobile and on page 57) to determine the desired FRA 

position.

2. To adjust, loosen the hex bolts (1) attaching the rear lower shock 

cross shaft to the rail beam.

3. Using a 9/16I wrench, loosen the jam nuts (2) on the preload bolts.
4. Adjust the preload bolts (3) to the desired FRA position.
5. Tighten the jam nuts. 

NOTE: Make sure the preload bolt contacts the slide block before tight-

ening the jam nut.

6. Tighten the hex bolts and torque to 35 ft. lbs. (47 Nm).

NOTE: When the M-10 suspension is new, it may take from 25 to 200 

miles (40-300 km) to properly break in the springs and shocks, 

at which time the suspension will be softer and may require 

FRA re-adjustment.

1

2

3

55

THE PERFECT FIT

FAST M-10 Rear Suspension Adjustments

Static Sag and Ride Height Settings

Rear Spring Preload

If FRA position alone does not allow the setup of the proper amount of 

sag, the center retainer of the rear track shock can be replaced with 

optional retainers to adjust the preload and change the sag. See your 

Polaris dealer for assistance.

NOTE: Whenever ordering any of the retainers listed in the chart, 

always order the retainer insert as well.  The insert is not 

removeable once installed, so a new insert is needed when 

installing a new retainer.

OPTIONAL RETAINERS

Retainer Insert 

Part Number

Retainer Part 

Number

Preload

Sag

5436109

5135077

Least

Most

5134923

Middle

Middle

5135080

Most

Least

 

 

 

 

 

 

 

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