I took great care in breaking in this sled. I was bleeding the coolant system weekly. I can assure you that there was NO air in the system. I went out lake running yesterday to see what the sled could do. I warmed the sled up for 10 minutes and then went on to the lake. I took it real easy for a couple of miles. The heat exchangers were hot as normal everything was good. I proceeded down the lake on and off the gas going around 75-80 mph. I ran for approx 8 miles and than I let her go. The speedo climbed to 112 mph and didn't stop climbing, I backed off and started to burp the throttle. At about 40 mph, it just died. I thought it was a smart valve issue because the sled pulled over easy. I waited about 5 minutes and started it back up, no problem. I decided to head back to my truck, and on my way back the same thing happened. As I was coasting to a stop I felt the heat exchangers, they were dead cold. Can you say seized. Has anyone questioned the small hose leaving the cylinder head which returns to the coolant tank ABOVE the coolant line with NO check valve. I would like to ask GLS if this line maybe could bring air into the system under high flow condition? Wouldn't the fast moving coolant entering the head act like a siphon in respect to the small line. I am adding a check valve to this line from a Polaris overflow line even if its not the problem. I am on 2 weeks holidays and I have a sled with 140 miles on sitting at my dealer with no top end on it. By the way, I was towed back 6 miles to my truck by a 94 Storm and did that ever draw a crowd.