Where are you finding these specs? I've only ever been able to find them for Mobil1.
"Motorcycle" oil doesn't tie anything to ZDDP. Unless ZDDP is the friction modifier for use with wet clutches, which I honestly don't know. All I do know is that the 'motorcycle' oils are rated so for clutch friction modifiers, not for flat tappets (although a great number of the jap bikes are flat-tappet).
