Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
JIS screwdrivers are Japan Industrial Standard, and they are different heads to the common Philips and Pozidrive crosshead screwdrivers. If you fins chewed crossheads on a Japanese bike, it's usually becase some previous numpty has tried using Philips or Pozidrive screwdrivers in them. I personally would not put vinegar, in fact ANY acid or alkaline near carb parts!