Most Japanese bikes can be fully disassembled and reassembled with:
- A JIS screwdriver set. (They are NOT phillips-head screws! They look like phillips, but they are not!)
- A 3/8" flex handle ratchet.
- A 1/2" ratchet/breaker bar.
- Short and long extensions for each of the above.
- Two torque wrenches - one 3/8" for the smaller torques and a big 1/2" one for the bigger torques. Buy the small one first, buy the big one separately when you run into something that needs it. (I actually only have one 3/8" beam-type torque wrench that reads up to about 60 N.m if I remember right) DO NOT CHEAP OUT AND SKIP THIS. A torque wrench is THE most important tool in your tool box. Get one and use it!
- Open and box end wrench set 8, 10, 12, 14, 17, 19mm. A 22mm can sometimes be handy depending on the bike.
- Sockets 8, 10, 12, 14, 17, 19, 22, 24, 27, 32, 36mm. The sizes beyond 19mm are for specific applications that vary from one bike to the next (I don't know what size your front and rear axle nuts are, nor your clutch hub nut)
- "Allen" sockets 4, 5, 6, 8, 10, 12 and a few specific larger sizes if your axles have socket-heads on one side.
- A spark plug socket 16mm or 5/8" (which are practically interchangeable).
- It will often be convenient to have Allen-head T-handles and keys in the smaller of those sizes. For example, the throttle body assembly on my ZX10R cannot be removed or installed without a long T-handle as it was designed with the use of that tool in mind, and nothing else will get into the space that it needs to reach into.
- Buy an air-impact or electric-impact tool when the need arises for it - which it eventually will. (Front countershaft nut, or clutch hub nut)