I wouldn't own a Z1 now Alan cos that bike in todays world would be lacking in a lot of things....and I'm no mechanic as you know.
But this brings me on to a real peeve of mine....when DAS kiddie journalists of today test a classic then rip it apart by comparing it to more modern machines.
The fact of the matter is that you had to ride machines like the Z1, Kwak triples, GS750 (yes, that was a superb bike) in THAT era, not this. Same as music...listen to some of the great rock classics of the 60s and 70s now and they sound flat and dated. But in that era they were groundbreaking. I remember listening to Hendrix and "Purple Haze" in the Summer of 67 and I didn't know those sounds were coming from a guitar. It sounds ridiculous but you have to bear in mind that prior to Hendrix, no-one had ever made a guitar sound like that.
So you see with all classic stuff, you had to be there to feel it. Looking back and comparing just doesn't do it justice.