Z1 parts should all be the same. They had same bore, same stroke....same.
Z1 was referred too as 73-75. They started calling it the KZ900 in 76 I believe.
Remember, don't work on your bike so much you never ride it.
The ones referred to "porkchop" cranks because of the shape of the counterweights, are Z1s. The KZ1000 cranks have round counterweights. Both have 15 tooth cam chain sprockets. If it has round counterweights and 16 teeth, it is a MK2
