Took a friends DRZ400 for a spin recently. I was looking at side by side with my 650 thinking that a 650 engine in the 400 chassis "might" make for an interesting and lighter bike. I'm in love with the torque of the big engine and think it'd be great in a lighter chassis. Anyone ever tried it? On a DRZ or anything else? And yeah I'm a tinkerer who does stuff like this a lot.... even if it doesn't really make all that much sense.