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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.