Nobody familiar with the 667?
(Sorry to double-jack this thread, but I can tell you that the Landflier 667 was one of, if not THE coolest go karts ever made! I had one when I was 15, it was my first/only "real" go kart! Hated that I had to sell it. It came to me without the plate for the jackshaft, I didn't find out about Torq-A-Verters and what not until a few years after I'd owned it, but my dad's coworker was able to fab me up a plate, but I ultimately ditched it and stuck with the clutch/chain setup. Thanks for posting those pics, brings back memories!)
(Oh, it looked like "Kartco" either purchased the rights to these karts or made clones of them, as the "Model 669").