Speaking of LTZ.. I just sold my Z400 earlier this year. I can't imagine how much fun that quad would have been with a better carb. Probably the only thing lacking on that machine IMO. Perfect for what it is. Especially reverse..
Have you ever looked into putting Z400 components on a buggy? More specifically, the wheels/tires/brakes? I would love to have Z400 aluminum wheels on the front of my buggy.
From my for-sale photos: