How do I do a Thundercat front end conversion?
You will need a complete Cat front end plus a complete 87-88 FZR 1000 triple clamp, upper and lower. The FZR triple clamp has the same offset as the stock FJ t/clamp and it has the same tube C/L to C/L as the YZF 600. This allows you to keep the stock FJ steering geometry while using all of the YZF support parts (fender, brakes, axel, etc.). The upper FZR triple clamp will need to be modified so that the FJ ignition lock will fit. You will also need one of my bar mount adapter kits ( you pay the shipping and its free). Other than that, its a bolt on deal. I installed the full Race-Tech upgrade to the YZF forks I have on my 89FJ, springs (1.0kgmm), compression & rebound gold valves, rebound rod bushings, bushings, seals, wipers, and fluid. Its a lot of cost but it does work well. If you want a look at my FJ I have a photo of it in my yahoo profile.