Best option is just to replace the forks. It's cheapest and least work.
If you want something different, fit a front end (yolks, wheel, forks and brakes) from a 636.
650 motor and zx6r frame isn't a minor project. Apart from very different engine mounts you'd have to offset the motor to line up the sprockets.
People aren't buying your parts because most of them also have wrecked forks and fairings with good motors as a result of buying bikes that they can't control as well as they thought they could.
Last edited by williamr; 12-10-2012 at 11:33 AM.