I might be acquiring a low-mileage XL600r in a couple days, but only if I can replace the sad little gas tank it comes with. I'd like to not have to fill up every 75 miles or so, thanks. So is it possible to use a tank from the same era XR, or does someone actually make a replacement tank? I've done a lot of googling, and I can't seem to find anyone who makes a large tank for the XL-R. Also, has anyone here fabricated/modded a desert tank? How hard/reliable is it to plastic weld polyethylene?