If you are looking for the best set up for a bike for both street and dirt, the best you are going to get is a compromise.
Cartridge forks are typically set up with certain terrain, weight and rider skill in mind. To achieve that, a spring rate is determined and a particular valve shim pac is chosen that will work best with a limited range of oil viscosity.
Most good cartridge forks have adjustments that the rider can change to slow or allow more flow through the valves on both compression or rebound, some even allow separate adjustment for low and high speed flow. Changing the viscosity has minimal good effect, it may even be detrimental causing the opposite of what you are trying to achieve. A small change may extend the range of adjustment available to the rider.
Once the internal parts are chosen, you are limited to the external adjustment for compression and rebound with some forks having more than others. I think most riders find that sufficient, because if you are starting with a dual sport bike, suspension is not going to make it competitive with a race bike anyway.
Bxr140 you are too quick for me tonight. See anything that contradicts you?
BMW Motorrad USA customer service: "We make superior motorcycles and continue to improve them."
itsatdm screwed with this post 12-22-2010 at 10:53 PM