Rode for many years 12-21 (mx 2 strokes, mostly mountain trails). Nightmare on the tight stuff with 2 stroke. Want to get back to my beloved sport. 4 stroke sounds appealing. Smooth, strong power, yet light enough not to beat you up...while still being able to get the adrenalin going. Would like a green sticker... I am 40 years old, very good shape. Work out 3-4x/wk, run. 6'4", 195 lbs. Enjoy trails, sweeping mountain roads, tight stuff. Experience was with 2 strokes...that power was intoxicating yet admittedly tiresome for this type of riding and basically almost impossible to negotiate the tight stuff with those late 70's 2 strokes. In short, powerful, light and controllable power...bigger 4 stroke? Realize that I am dating myself. The technology is so much more advanced that perhaps my understanding is off base for what is available today for a given cc displacement. Thinking that a 250 2 stroke comparable with a tricked out 400 4 stroke (understanding the difference in power delivery along the powerban). Points: Heard the xr 400 was bullet proof, just a bit heavy, underpowerded and cumbersome? Praise for reliability. Ktm 400exc, more race ready yet more expensive and more maintenance. Have been told that a pre 1997 2 stoke, green stickerable, and modified "down" for trail would be good. Wr450 gets good praise, although don't think that it is green sticker. So what would be the suggestions for a good overall bike for trails, cross country, desert, tight trails...I'm asking too much I know. Thanks ever so much for your advice and consideration. Looking forward to trying to rekindle those childlike ways of just enjoying the play, fun and love for the outdoors!