Polaris IQ Turbo LX Owner's Manual page 66

FAST M-10 Rear Suspension Adjustments
Static Sag and Ride Height Settings
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.
3. Subtract Y from X and you will have the SAG setting (X - Y = sag
setting. Example: 21 - 17 = 4). The correct amount of SAG 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 64-65.
Suspension Recommended Sag
M-10 128
(LX)
X
3-4 inches (8-10 cm)
THE PERFECT FIT
Y
Adjustment
FRA Position &
Rear Track
Shock Spring
Preload
See
Page
64
65
63