I trimmed a set of FZ1 springs to 3.5" OAL (88.9mm) & they seem pretty close to optimal. Throttle response is excellent & they don't lean-spike on roll-on. I'm calling this good for the springs.
The ironic thing is if I didn't experiment with the turbo sled springs I likely would not have figured this out.
This is now a very "happy" motor; those who have experienced it know what I mean.
The fuel level can maybe go a bit lower, gotta check that again. After I confirm the fuel level I'll do a carb sync &, then back to the dyno...
