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i assume the torsion bars are the 25mm ones? If so, the increase in spring rate will probably be about right for a quick street machine with the extra rear end weight. If you want to be more precise in the adjustment you could reduce the torsion bar to the N/A one 23mm (a Type 3 ones the same) and add a light coil over so that you can select the correct overall spring rate for your application/preference.
With that extra weight bouncing up and down on the rear a six point kafer cup brace would be a worthy investment as it stiffens up the frame horns as well as the damper mounting point and providing substantial lateral stiffness.
evilC
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