I ride from 8,000 to 12,000 feet, so I boil over fairly often. This year I've added an overflow tank from a WR. I had to make a bracket for the front mount, seems to work fine so far. http://i83.photobucket.com/albums/j305/TotallyMetal/Dirtbike/yz426001-1.jpg http://i83.photobucket.com/albums/j305/TotallyMetal/Dirtbike/yz426002-1.jpg Nice setup! Can you see the water moving through the line when your riding, indicating that your bike would be running hot? I guess the only other way to tell is by the level in the resivoir which is behind the seat.