Snowmobile Polaris 600 Fusion (2006 year). Manual - part 11

44

THE PERFECT FIT

IQ Front Suspension Adjustments

Front Shock Spring Preload

The factory preload setting should be appropriate for most riders and 

conditions. Please see your Polaris dealer for assistance before attempt-

ing to adjust preload.

Increasing the spring preload too much may adversely affect the han-

dling of the snowmobile and the performance of the rear suspension.

Decreasing the spring preload too much may allow the upper spring 

retainer to fall off.

Shock Valving

RydeFX shocks can be revalved if spring preload alone isn't sufficient 

and further adjustment is desired to control suspension stiffness.

Front Springs

The front springs can be changed if spring preload alone isn't sufficient 

and further adjustment is desired to control suspension stiffness. See 

your Polaris dealer for more information.

WARNING

Changing shock valving on RydeFX shocks requires special tools and a 

sound knowledge of mechanical theory, tool use, and shop procedures to 

perform the work safely and correctly.  Shocks contain high-pressure nitro-

gen gas.  Use extreme caution when handling high-pressure service equip-

ment. We recommend that this work be performed by a Polaris dealer.

45

THE PERFECT FIT

Rear Suspension Adjustments

Rider weight, riding style, trail conditions, and vehicle speed all affect 

suspension action.

Each rear suspension can be adjusted to suit rider preference and deliver 

excellent performance for a given set of conditions.  However, all sus-

pension designs and adjustments involve a compromise, or trade-off.  

For example, a suspension set up for snowcross racing would provide a 

very stiff ride on the trail.  A suspension set up for trail riding would 

bottom out harshly on a snowcross course.

Refer to the suspension setup label on your snowmobile, or see your 

Polaris dealer for initial suspension setup information. Additional 

adjustments can be made after initial setup.  Make adjustments to one 

area at a time so you can evaluate the change.  For further assistance, see 

your dealer.

46

THE PERFECT FIT

Rear Suspension Adjustments

Suspension Performance Tips

• Rider weight usually determines the position at which the spring pre-

load should be set.  However, this may vary with riding style.  With a 

little experimentation, each rider can find a preferred setup.  These 

adjustments are easy to make, involve very little time or effort, and 

greatly affect the ride.

• In deep snow, a new rail slide will offer improved performance over 

worn rail slide.  It can also improve top speed.

• When riding on ice or hard-packed snow, adding a set of bogie wheels 

to the rail may enhance the machine's performance.  Bogie wheel kits 

are available from your dealer.

• Polaris offers track kits for improved flotation in deep snow.  See 

your dealer for assistance.

NOTE: Keep the suspension pivot points lubricated.  This will reduce 

moisture and rust build-up and ensure proper function of the 

suspension components.  Grease rear suspension pivots 

before adjusting the rear suspension.  Refer to Suspension 

Maintenance beginning on page 120.

Track Tension

Track adjustment is critical for proper handling. Always maintain cor-

rect tension and alignment.  Refer to the track tension maintenance sec-

tion beginning on page 114.

47

THE PERFECT FIT

IQ Rear Suspension Adjustments

Initial Spring Preload Setting (Sag Method)

To set up the IQ rear suspension tor-

sion spring preload, measure the 

distance between the ground and 

rear bumper.  This is measurement 

X.

Take the first measurement with no 

rider and with the rear suspension at 

full extension. 

NOTE: The rear bumper may need 

to be lifted upward slightly 

to fully extend the rear sus-

pension.

Next, have the rider drop down hard 

on the seat and bounce up and down 

several times, collapsing the rear 

suspension. With the rider seated, 

measure the distance between the 

ground and the rear bumper at the 

exact location used for measure-

ment X. This is measurement Y.

To determine sag, commonly referred to as ride-in, subtract measure-

ment Y from X (sag=X-Y).  Adjust sag by rotating the torsion spring 

preload cams located on the rear torque arm. See page 48.  

NOTE: The ideal amount of sag recommended for the IQ rear suspen-

sion is 4-5 inches (10-13 cm).

X

Y