[Warp12]

There should be no problems with this.

This is good information. There are some differences in the frame, I think. But I wasn't sure about the engine mount points. Normally you would have to twist the factory's arm to make such a tooling change. For example, you can put a 14R motor in a Gen1 14, even with the additional 4mm stroke it comes with.

 

[Warp12]

As an alternative to having machine work done to mount the GSXR shock, another thread indicates that one can purchase the lower mount pivot from a 400 and use it on the 500. I haven't tried it yet, but should know later this week.

Like this: View attachment 34545

I've been wondering about this, because I plan to install preload adjusters/springs on the forks this winter and was looking for a reasonably priced upgrade to the rear shock.