for working on Jap bikes you need a JIS screwdriver as a normal philips will just cam out and chew the head. i got this
https://www.onlyqualitytools.com/cat...ewdrivers.html and it has been a life saver especially the impact when loosening (it only loosens on impact) the top carb screws. its not a full JIS screwdriver but its damned close. for most screws you only need the PH2.