GSXR front ends seem to be a common swap. I recently did a Z1000 upside down front end on a 400F, and it looks great. I have a SV1000 front that I'm going to swap onto either a 350 twin or a 350F just for giggles. What I noticed with the 400F is that it is radically more stable with the Z1000 forks. It isn't even a fair comparison how much better it handles bumps, and how much more stable it is in turns. To give you an idea, I had a piece of gunk block a float needle a month ago. I was 80 miles from home without tools, so I just turned the petcock on and off to fill the bowls, then drain them... then fill... then drain... for the 80 miles home. I rode one handed the entire time between 60 and 80, and the bike was rock solid over everything I drove over on the highway (there is some pretty bad pavement on 101 north of San Francisco!!! The bike also drops into turns with gusto.
All front ends should fit if they are standard style sliders, or USD, and the same, or similar, lengths. Understand that you might have to pound the front of your tank in to clear the forks, or you might need to make triple trees to offset the forks enough to clear the tank. This is because our stock fork offsets are typically much longer than modern fork offsets.
Camelman
