Hey Guys,
Very preliminary, but I've aquired a set of 40mm carbs to upgrade my ZRX, and I compared the spacing to the spare set of 77- carbs I had on the bench, and was pleasantly surprised to see the spacing is the same!!!
ZRX uses Keihin CVK 36mm sidedraft carbs, so there's potential for this to work, and it puts me one step closer to one day installing the 916cc pistons and block I have sitting on the shelf!