About six months ago I bought my first JIS screwdriver - from Vessel (a premium Japanese brand) and it included an impact driver built into the handle. The tip is a #2 which will do most all the screws on your bike. I couldn't believe the difference in using this screwdriver (especially on carburetor bowl screws) compared to my old Phillips screwdrivers. I wanted to add more to my toolbox and looked at all the types - they even have ones with a bolster that allow you to put a wrench on for added torque. After lots of looking I decided on my next JIS screwdriver (but not my last.)
This week I received a $15 Vessel 220W Ball-grip screwdriver with replaceable tips/shafts in #1, #2 and #3 sizes, along with a flat blade which fits beautifully into jet slots and bowl drain slots. It was here in 2 days via Amazon Prime. The hex shafts allow me to slip a wrench on to add torque for the tough, large screws on the carb rail of the CB750 I'm working on. I really like this driver - if I were to nitpick it, I would like it to be about 2 inches longer for reaching carb bowl screws while on the bike, and if the handle was bigger and heavier it would allow me to spin screws our faster. I guess those comments would be in regards to designing the "perfect" JIS driver for me. Don't get me wrong, it's a good size and has a nice feel. It's small enough to be in your on-bike kit I would think. It comes with 3 shafts, one of which is Pozidrive (improved Phillips) which I just stuffed in the back of my toolbox. In my opinion, it's the best value out there for an all purpose JIS screwdriver - if you don't have one yet, this is a great starting point.
It's recommended: https://www.amazon.com/gp/product/B00E55DL4I/
This week I received a $15 Vessel 220W Ball-grip screwdriver with replaceable tips/shafts in #1, #2 and #3 sizes, along with a flat blade which fits beautifully into jet slots and bowl drain slots. It was here in 2 days via Amazon Prime. The hex shafts allow me to slip a wrench on to add torque for the tough, large screws on the carb rail of the CB750 I'm working on. I really like this driver - if I were to nitpick it, I would like it to be about 2 inches longer for reaching carb bowl screws while on the bike, and if the handle was bigger and heavier it would allow me to spin screws our faster. I guess those comments would be in regards to designing the "perfect" JIS driver for me. Don't get me wrong, it's a good size and has a nice feel. It's small enough to be in your on-bike kit I would think. It comes with 3 shafts, one of which is Pozidrive (improved Phillips) which I just stuffed in the back of my toolbox. In my opinion, it's the best value out there for an all purpose JIS screwdriver - if you don't have one yet, this is a great starting point.
It's recommended: https://www.amazon.com/gp/product/B00E55DL4I/