Well, I hope this doesn't end up being a double post, but I wrote a dang novel, and it doesn't seem to have posted, though the forum says it did.
Anyway, even though dnmac has unkind words for the zook, they are good quads. My dad has owned two, and they need some love, but run and ride good overall. They are a tad hefty, but no more so than a Raptor. They have a low COG, and good suspension. He has never blown a head gasket, since they cured that problem in 87, and the aftermarket has a cure for the 87's too. IMO, the LT500 is a much better machine than a cobbled together Tecate frame with a K5. Now, a highly modded Tecate with aftermarket suspension would be different, but why would you do that when a zook comes stock with very good suspension? If you didn't feel bad about mixing brands, a K5 engine in a yfz, or ltr 450 chassis would be sweet!