I'm 40:ride: Twenty years a ago a did a lot of amateur racing in the east, even rode the first ever Loretta Lynns in the early 80's. I haven't ridden much sinc 1987. The new 4 strokes have totally confused my search for a bike to ride the local tracks with my kids. It seems the 4 strokes have a lot more to be concerned about, and cost a lot more to repair. I'm looking at an 03 YZ450F and an 04 YZ450F. But have never ridden one on dirt. Give me some opinions on 2 vs 4, for a forty year old whose going to try to ride like he's 20 again.