I've been thinking of picking up a dirt bike for a while now and am curious what you guys think. I've been out of the bikes for a lonnnnnnnnnnnnnnnnng time now, so bear with me. I'm leaning toward a Honda XR400, but now I see things like the CRF450 and CR500 being used a lot. I just want to ride the trails that are too narrow for my '40 or ATVs. I won't be jumping it, riding wheelies at 60, or anything X-gamesish. Any input on 4-stroke vs. 2-stroke? How about size (does it really matter)? What do you have/recommend and why? By the way, I'm a fairly big boy at 250, so I think anything less than a 400 wouldn't cut it............am I wrong?