Been Around the Block
so what exactly did you need to do to the speedo to make the dual disk fit?
It‘s pretty simple :so what exactly did you need to do to the speedo to make the dual disk fit?
Thinner oil will lighten up rebound damping as well as compression. Have someone hold the bike and then press down hard on the front end and let it spring back on its own. If it comes up too fast, you need more rebound damping and if it takes more than about a second to rise, it needs less rebound damping. Likewise for compression damping. You can feel the resistance as you press down. If you can push the forks down with little resistance, they probably need more compression damping and if it feels like the forks are full of sticky goop, there's too much compression damping.
That will give you some idea as to how the damping is balanced. You may need to drill another pair of holes in the damping rod further up to eliminate any restriction there and to allow the emulator to take care of all the compression damping needs.
With emulators, the spring preload controls high speed damping (hitting a pothole etc) so get the low speed damping right with oil viscosity and then soften the preload to take the edge off high speed damping by allowing the valve to blow off earlier. If you can't get them right within the range of adjustment, you may have to try softer preload springs on the emulators.
When the front end is right, repeat the push down but this time closer to the rear of the tank and both ends of the bike should rise and fall together - not one end all stiff and the other end diving. It should be reasonably balanced back to front.