As far as dirt bikes go, I've only owned and will only own a smoker... My son has a quad (yes he's a quad turd), it's a Honda 400ex with the tried and true XR400 4 stroke engine. If I could find a Honda 250R (2 stroke) quad to trade, we'd be all over it... He's still a fan of 2 strokes, but the 400ex is hard to beat, (Especially since we rebuilt it this past winter).