I agree with gasgasman in that the powervalve response to rpm should be measured as an assembly. The response curve of just the unloaded powervalve centrifugal drive unit will be different than the complete powervalve assembly. The load of the bell crank and linkage is likely to be relatively constant, but the pressure and resulting force of the exhaust gasses on the powervalve in the exhaust port is likely to be variable relative to RPM, engine size and engine load.
It is also my understanding that there are and have been differences in the spring rates and amounts of preload between engine sizes, years and bike models.
That being said, I do think the concept is a great idea. I just want to caution people that the results may not be directly or universally applicable.
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