Dr.Jass
Pastor of Muppets
Back when I was paying attention, the only difference between the WR and the YZ engines was exhaust-cam timing. The cam was the same, just re-timed to make the bike less peaky--but I'm talking about the 426s and 450s. I probably wouldn't have chosen either over the bike I had at the time: an '89 XR200R poked/stroked to 247. That bike was a hoot; I still miss it, but I haven't owned another since. My only complaint about that bike was the brakes (drums). The engine was great.