Well, let's see... if our forks are 35mm, then perhaps the Mike's XS damper valves ( also known as cartridge emulators) would fit. (They are cheap, at around $55 a set). I used a set in 1982 Yamaha XZ550 Vision forks, and they really made a difference in ride quality. You do need to pull the damper tubes and drill them for extra holes, etc. but when you get them done, they really make a ride quality difference in the rebound and compression damping. (Oil viscosity sets the compression damping). And you could replace the almost 50 year old springs with some new ones from RaceTech or another one of the spring manufacturers. Chances are, they need replacement, and if you plug in your bike and weight, in the spring rate calculator on their website, you will find the correct rate for your bike. It is usually higher than the stock rate. Those tow things will really help.
There is a fellow named Matt Patton who installs cartridges from GSXR600's into various forks, I had him do a set of 36mm Ninja250 forks, for a race bike I am building, and he has good reviews. I want him to do a set for my 2006 Kawasaki Concours. Jaime Daugherty also has a good reputation in reworking front forks, and rear shocks. DMR Racing is his company, in Ft. Wayne Indiana. Anyway, the install of the MIke's XS valves, and new springs, at the correct rate for your bike weight (and yours too) will make a lot of difference, and installing some good shocks in the rear will complete your bike's ride.
Charlie
