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Message: <blockquote data-quote="Fred W" data-source="post: 1361093" data-attributes="member: 3828">Great info.  Thanks for sharing that.This is exactly right.  It is the stock valves that require you to use a thin suspension fluid.  Not so much for the slow speed (adjustable) damping, but rather for the non adjustable high speed damping that is fixed and set internally by springs and reeds.  Remember that you really do not want very much high speed damping to have the most responsive suspension and allow the wheel to follow irregularities in the road.  It is the low speed damping that you want more of, but not at the expense of increasing high speed stiffness.Going with replacement aftermarket valves (or cartridge) can lessen the need for such a thin suspension fluid by increasing the number and size of the high speed orifices.  If you have upgraded your fork valves you really NEED to ask the manufacturer what viscosity (in cSt) they recommend with their valves.  Just make sure that they understand that the bike will be used on real world streets, not a nice smooth race track.</blockquote>