Re your springs have you tried going to a local spring place and seeing if they can wind you a spring?It is not a black art.If you take your spring with you they can take measurements and calculate the rate.Using those measurements and your nominated rate they can wind you a spring,maybe even a progressive.At one time i got a couple of springs wound for a mountain bike,they were about 60 dollars each.A motorcycle one would obviously be lots more,but you can get exactly the rate you want.
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