there should be a black knob at the top of each side of the fork. see if they have any arrows and markings. if not just turn them all the way one direction and test ride. if it does not get stiffer go the other way.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk