with yamaha (hopefully) putting the aluminum frame on the thumpers next year, i was thinking... why have an oil tank in the frame, when you could have an oil cooler as the oil tank? maybe i dont know the specifics (like capacity, placement, etc.), but the current oil-in-the-frame setup seems like it would insulate the oil temp. why does that make sense? maybe just a smallish cooler in front of one of the radiators, then the coolant would take the heat from the oil and disperse it. this would have to reduce the overall temp of the engine. the way i see it: oil tank - keeps the oil hot, but cant be smashed in a crash. oil cooler - cools the oil, but could get smashed and leak. if the only disadvantage is the cooler being smashed, why not just put a gaurd on it? they are on those high dollar xr50's, why arent they on the bigger, hotter 4 strokes?