Most people see screwdrivers as two types, a flat-head and a Philips-head. If you have ever tried to remove cross-head screws from a 25 year old Suzuki you have probably seen rounded off screw heads, and all sorts of nasty attempts to remove them. Japanese motorcycles manufacturers use Japanese Industry Standard (JIS) screws, which have a slightly different profile to a standard Philips.  Philips screws have a tendency to cause the screwdriver to lift out under load, which also causes damage to the screw head.  JISPhilips

JIS screw heads are usually identifiable by a single dot or an “X” to one side of the cross slot. It’s always worth checking the screw heads prior to attempting to undo them.


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