Hi Val,
Use the chart linked below to work out what spring rate suit you best (you'll want the 'Sport' red line unless you're only doing trackdays & racing). Bike is about 465lbs wet weight unless Yamaha are spoofing, just combine that with your own body weight.
http://www.mad-ducati.com/Technical/race...Chart.html
For single rate springs, K-Tech do them at various increments for the SV650 and it's just a case of trimming the inner metal spacers to suit both spring length and emulator height.
Alternitively, I've had great success with Honda VFR750 / early VFR800 springs which occasionally appear on ebay.
Also try & source some fork cap preload adjusters if you don't have any on your existing forks.
Use the chart linked below to work out what spring rate suit you best (you'll want the 'Sport' red line unless you're only doing trackdays & racing). Bike is about 465lbs wet weight unless Yamaha are spoofing, just combine that with your own body weight.
http://www.mad-ducati.com/Technical/race...Chart.html
For single rate springs, K-Tech do them at various increments for the SV650 and it's just a case of trimming the inner metal spacers to suit both spring length and emulator height.
Alternitively, I've had great success with Honda VFR750 / early VFR800 springs which occasionally appear on ebay.
Also try & source some fork cap preload adjusters if you don't have any on your existing forks.