We have a couple of customers with 100,000+ miles on their Z1's. I saw one with 175,000 on at Mid-Ohio a couple of years ago. We've a local customer who rides his to work each day during the summer that has over 80,000 miles on it - and it's all original - never rebuilt (although it sounds rough these days).
Let see after 85,000 miles I put a Yoshimura 987 kit, Yoshimura Cam, Big Valves, Balanced & Welded Crank Shaft, and put 29mm Smoothbores.
Went about another 95,000 miles, went back to a stock 903 & stock head.
The next time I took apart after about 55,000 miles I went Vance & Hines 1015 together with new Cams & adjustable Cam Sprockets & finely put electronic ignition on, why I waited so long I don't know. That's the way she runs today, the old girl was my Daily rider up in till I bought a 2006 Honda ST1300 June 2008
I have another post that has some pictures I can't seem to put any with this post. http://www.kawasakimotorcycle.org/f...25-new-group-still-riding-old-1973-z-1-a.html
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