I'm moving up to the 250 class, after riding my dad's YZ250. My YZ125 is much too small (6', 250 lbs). I'm looking at a '99 YZ400 for about $2,700 (California prices are high). Should I go 4 stroke, or stick with 2 strokes and get a YZ250 or equivalent? I'm not really sure what to do now. I don't really have much mechanical knowledge, so I want something reliable, but fast and fun. What's the better choice, 2 or 4? What are general impressions of the YZ400F?