Figure 1: FOX High Pressure Pump
The bottom out control valve provides position-sensitive end stroke damping. This allows for a seamless transition from small bumps to big drop bottom outs. The Bottom Out valve is not adjusted directly. Instead, its behavior and performance characteristics are influenced by the air pressure setting in the reservoir and by adjusting the reservoir Bottom Out Control knob.
To change the range of Bottom Out Control damping characteristics of your DHX RC4 shock, attach a FOX High Pressure Pump to the air valve on the reservoir.
Note: The factory pressure setting is 160 PSI.
Ride your bike and verify the settings, before repeating the procedure.
Note: The hiss sound of air loss comes from the pump hose, not the fork.
CAUTION: Never ride your bike with more than 200 PSI or less than 125 PSI in the DHX RC2 reservoir air chamber. Doing this can damage your shock, requiring repairs that are not covered under terms of the warranty. In racing applications, FOX Racing Shox uses nitrogen gas in the reservoir. For every day riding, air from the hand pump works fine; after all, it's ~78% nitrogen anyway.
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FOX Factory Inc.