Zero Motorcycles 2014 ZERO S, Owner'S Manual

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General Operation
4.20
Compression Adjustment
The compression adjustment knob is at the top of the
shock. It has 18 stages of adjustment. The knob has “+”
(slower compression) and “-” (faster compression). Turn
the adjuster clockwise for slower compression. To speed
up compression, turn the adjuster counter-clockwise. Start
with a middle setting and fine tune the compression from
there. Proper compression allows the tire to track the
ground over consecutive bumps. Compression that is set
too slow will pack-up (feel harsh over consecutive bumps)
while compression that is set too fast causes the shock to
bottom out harshly. If the shock is bottoming out, turn the
adjuster one click at a time until the bottom out stops.
Note: Adjusters should never be forced completely “Fast”
or “Slow”; always leave one click of adjustment in either
direction.