I am planning to change WR426 to the YZ tank & seat. If the stock YZ tank could make it 50 miles in eastern conditions, that would be good for me. How about using the stock coolant overflow tank for a back up fuel tank? I know Acerbis makes one, but I would only need it a few times a year when I go to VW or TN. Then I don't have to deal with any of the mounting problems of aftermarket tanks all year for something I only need a couple times. I don't even care if I have to unbolt the thing to pour the gas into the tank if I need it. Do the YZ's have a higher pressure cap? Any comments?