Eastoe - I think you have an early Z1000 based on those numbers. The 1977 Z1000A1 model kicked off with frame # KZT00A - 000001 and goes through to KZT00A027500. The 1978 Z1000A2 kicked off with frame # KZT00A027501.
The MkII models 1979/80 should have a frame number code of KZT00D.
Its easy enough to tell the difference from looking at the frame/motor anyway. Early Z1000 frames have the pillion footpegs/exhaust bracket located on a large solid gusset - the MkII frames had welded tubes. The early Z1000 motors have round ends on the cam covers, the MkII motor has rectangular ends. Early Z1000 motors have plain smooth-finished engine covers and are plain unpainted in stock form, the MkII motors are black and have finned engine covers (alternator, points cover). It is easy to fit MkII motors into early frames, or early motors into MkII frames, this happens often.
If you have some photos mate, bung 'em up. That will make it real easy.
