I don't understand what you find so odd about my approach. I don't have a crank for my machine and have to find some way of cobbling one up. There are a number of parameters I have to match, to come up with as functional a replacement as possible. One of the major characteristics flywheel, that has very much to do with its performance, is its weight. Therefore, it is only logical that I try an find the weights of all the alternatives before I decide. Sure there are other important parameters, but weight is easy to measure and easy to communicate, so why not know it?
Re the S&S WR/KR wheels, I too had assumed they were just Sportster based and would be similar in weight. But the fact that they need a modified pin to fit their reduced thickness suggests that they may not be. But how then can we quantify the difference, without having examples of both to compare and examine? Weight comes to mind.
While the difference in reponse between a 20lb and a 10lb flywheel would be intellectually interesting to know, it doesn't have an relevance to what I am trying to do since I am not trying to reinvent the wheel, but am rather just trying to find out what the HD race dept in its wisdom though was best, and so I can try to come as close to that as I can, without spending too extravagantly.
I fear I am not communicating very well, as this seems very basic and non-controversial.
I'm going to be a bit brusque here (keeping in character).
"we know that the lightened racing flywheels have less torque and require more buzzing but give faster power"
No, we don't know this - it's not true.
"without knowing the actual weights, it is very hard to get the results one wants."
The S&S wheels are Sportster-based, and about stock weight. Both the stock 45 and Sportster are about 20 lbs.
And, again, again, what do you think "knowing the weights" do to help you plan what to do to yours? If a WR wheel set is 16 lbs., what does that mean?
As I asked before: if the stock 45 wheels weigh 20 lbs., how different will the response be with 10 lb. wheels?