Motorcycle: 1985 GSXR 750, 1986 GSXR Limited, 1989 GSXR750 RR (being assembled), 1973 GT-750 (no longer have, looking for another)
Re: Part for my slabside
Yeah, not much on a Katana would be direct swap and nothing would really be performance update. I'd pick up the speedo drive from the dealer. I picked up one for my 85 two or three years ago so I expect they still have stock today. Calipers can probably be had from the Classifieds on this site and you can probably get a line on anything else you're looking for as well.
Why do you want to lengthen the swing-arm? The 85 was slightly shorter than the 86/87 and is a bit more stable but lengthening it will affect the geometry of the bike.
they start saying things like" it really hits when you hit 8000rpm"
just another way of saying"the jetting is fuct untill you get on the mains"