49
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
maximum 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
suspension, sag is controlled by two settings, t he full range adjuster
(FRA) position and the rear spring preload.
1. To check sag, raise t he 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 t he 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, m easure 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 FAS T 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 50--51.
X
Y
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