Hang on, there's a much easier way to do it. All you have to do is get a couple of shims (washers) and put them on the top of your stock shock. It's quite easy to do. Remove your gas tank, seat(s) so that the nut on the top of the shock is exposed.
It's nice to have a front end stand for stability, but if you've got a buddy or two that will help you're set.
What you need to do is remove the nut that's on the top of the shock. If you look where the top of the shock mounts to the frame, you'll see that there's a U-shaped bracket on the top of the shock. Welded to that U-shaped bracket is a piece of threaded rod. The threaded rod goes through the frame and the nut holds the threaded rod.
What you want to end up with is a shim/washer between the U-shaped bracket and frame. You DO NOT need more than two washers in there, in fact I'd try one first.
So, you've undone the nut that's on the threaded rod. Next you want your buddies to lift the rear end of your bike up high enough so that the threaded rod comes out of the frame.
Then place ONE washer over the threaded rod and reverse the process. What I've done in the past (when I couldn't get someone to give me a hand) is I got 2 tie downs and secured them to the subframe and the rafters of my garage. Then you can lift and lower the rear end of your bike yourself.
This is an easy mod to do and doesn't take much time at all. But, I wouldn't recommend it unless you're going to spend some time getting your suspension sorted on the track.
Here's a pic :