Polaris 900 RMK - Manual (Page 53)

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THE PERFECT FIT
IQ Rear Suspension Adjustments
Rear Shocks
ARVIN Rapid Adjust Shock
The ARVIN Rapid Adjust shock is available as an option on some
models. Turn the Rapid Adjust knob (A) on the shock reservoir to
make adjustments to the compression damping.
Positions are labeled on the shock. When adjusting, we recommend
that you turn the adjuster slightly, then test ride.