04-14-2020, 09:57 AM
(04-14-2020, 07:30 AM)Cormanus_imp Wrote:(04-14-2020, 05:08 AM)pekingduck_imp Wrote: I think Honda phased out JIS screws 20 years ago or more, although there may be some electrical sub-assemblies that have them, and on carbs. I remember back in the points and condensor days, JIS screws holding them on had a different thread pitch, so lots of points plates got stripped as a result.
Countersunk screw heads like the 4mm ones on master cylinder caps are hard to loosen because they have a lot of surface contact area (and friction) under the head, and are prone to corrosion. A cross (+) is used in that application so that the 4mm threads aren't easily snapped off, as if it would be with a hex bolt or hex socket head. When removing master cylinder covers, I usually just grab the hand impact driver and give it a light tap to break it free, never fails.
Are you saying the screw heads on the CB1100 are not JIS? I’m confused now.
Are you saying the screw heads on the CB1100 are not JIS? I’m confused now.
I think Honda phased out JIS-head screws 20 years ago or more ...
The distinction between JIS and Phillips screw heads hardly exists any more in practice. I don't think there is any Honda reference to them anymore as JIS-head, just refers to them as Phillips or simply (+).
A good JIS screwdriver will fit fine in a Phillips head. A good Phillips will work fine in JIS screws. For the most part, only carb bowls and tops use JIS, maybe some sourced electrical components.
Honda bikes and cars have been made throughout the world, including Europe, UK, South America, India, Mexico, US, and of course Asia, and there needed to be a common standard, as hardware may be sourced locally. (Hornet 599 and 919s were made in Italy.)
Too many cheap, wrong-sized, too pointy (Reed-Prince), worn out screwdrivers, and previously-rounded slots often are blamed for stripped screw heads.