Evenin folks, just a silly question that's been bugging me since I bought my crf. My brother has a NX250 (88?) that I have ridden quite a few miles on. Now, I haven't had a chance as yet, to ride them back to back. But I'm convinced that the old NX would walk all over a crfl in stock form. And I'm not certain that it wouldn't out perform my crf even with the ejk and filter mods. For those unfamiliar, the nx is a water cooled, carbed, 6 speed street/dirt bike from back in the late 80's early 90's. So my question is, if Honda had a design and tooling for a bulletproof (brother has 30,000+ miles) water cooled 250 motor already developed, that performs as well or better that our crf's, why start from "scratch"? Honda is well known for leaving well enough alone, sometimes for decades at a time. So unless the old design was just fantastically expensive to build, I just can't figure out why.