Have you ever wondered what would happen if you lost all your coolant on the trail and still had 25 miles to get back to the truck? So you fix the leak but now your radiator's empty. You're out in the middle of nowhere and all you have is your Camelback full of Gatorade. Do you put that in the radiator? I had just recently been pondering that question. Yesterday I got the answer. We had been riding pretty hard through some nasty singletrack (well, almost singletrack-it was really just a course the leader picked that went through/over a bunch of felled trees) when Tom, a rider on a YZ426 in our group, pulled up behind us with steam and water spewing all over the place. We thought at first that he was just boiling over because of the slow nature of the "trail." But it was worse than that. The hose that connects the lower left side of the radiator to the water pump had sprung a leak. Luckily, the hole was right next to the hose clamp. All that we had to do was loosen the clamp and slide it to the other side of the hole. So the leak was fixed, but the radiator was pretty much empty. And the YZ doesn't have a overflow reservoir. What to do? Each of us carries water/Gatorade in varying concentrations but nobody had pure water. The guy with the weakest mixture of Gatorade was chosen as the source of coolant. He filled the radiator from his bite valve, replaced the cap and we fired it up. No leaks-so far, so good. We rode for about 10 minutes and checked it. Still no leaks and it wasn't boiling over. We were worried that the Gatorade would lower the boiling point and would boil over easier than normal. But everything went fine for the rest of the day. We actually continued riding like nothing was different. Tom didn't have any further problems the rest of the day. Has this kind of thing happened to any of you? What did you do, maintenance-wise after the ride? We suggested that Tom flush the radiator thoroughly several times before he puts in his norma coolant mixture. But we now know what to do if this happens again.