Socket head screws are nice, but you can use the stockers if you get the correct screwdriver. The head bolts, backplate bolts, and carb rotor retaining screw (the little teeny one) are JIS, NOT Phillips! A phillips driver will not work well in them, but JIS will grip them very well. On the other hand, for some reason a #2 phillips works best on the carb mounting screws, the muffler bolts, and the muffler thru-bolt.