Ok - there must be a reason, but I haven't found it. A couple years ago I spun the hub on my 1985 XR2 Black Max 150, and she overheated. Melted a few wires. I changed the T-state, and the water hoses, and the impeller for the water pump. I even installed a new oil pump to be safe. Started right up & seemed to run fine with water muffs, but a little hot. The pee hole water was real hot. So, I took it to the lake for a test, and decided to make a run accross the lake. Within a minute, the temp guage redlined. The pee hole turned to steam, so I shut down and took it home. Why would this be happening? I don't know what else to change or check.