Polaris FST Touring - Manual (Page 56)

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THE PERFECT FIT
Switchback Rear Suspension
Rear Shocks
When adjusting, we recommend that you turn the adjuster slightly,
then test ride. The recommended setting for this shock is eight (8)
clicks counter-clockwise.
FOX Zero Pro XC Shock
The FOX Zero Pro XC shock is standard on the Switchback model.
Turn the adjustment knob (L) on the shock reservoir to make
adjustments to the compression damping.