[rayobot]

Check the dogbones (located directly underneath the rear shock). They might be aftermarket adjustable dogbones, if the PO said they turned something. If they are adjustable, you should be able to get it to stock height pretty easily.

 

[rayobot]

http://www.ebay.com/sch/i.html?_nkw=sv650+dogbones

Check out these pics on ebay. Then look under your bike underneath the rear shock. See what you have.