One of the guys in our group decided it was time to get a new sled. He had been running a 1996 Ski Doo MXZ 670. One of the most bullet proof motor ever built. This sled has been through hell and back. 10 000 miles plus. It still had 120 psi in both cylinders. The only thing replaced on it was the pull cord once or twice. In the time from when he bout it he changed plugs once because he thought it might be a good idea. The plugs were still fine but after 6 or 7 years he thought itd be a good idea. The only reason he decided to get a new sled was this past season the sled had its first problem. We were on lake Namakogen up in the Clam Lake area and the sled locked up a few times, and the sled was missing coolant. No puddles, so we replaced the seals below the Juggs and between the head, and then the thermostat seal. This was all at a cabin with no electricity, and just the tools we had with us for the trip. Both juggs come off separately and both pistons were in good shape. Once it was back together it ran just fine, a little bit of damage do to burning the coolant in the combustion chamber. So a little bit of oil added to the gas helped. After the first incident with his sled after 14 years he decided it was time for a new one. So we all went to the spring Ski Doo sale, and we figured he would get a 600 or 800 Etec. Well he decided on the ACE 600. The guys at the show said that the power was less of a regular 600 (two stroke). Our friend was not deterred by this, He decided that the mileage was important and that giving a 4 stroke a try was a good idea. So it is being built this summer, he is getting it red and black. So were all looking forward to riding this sled, since the newest sled in our group is an 01 Ski Doo 500 touring, and an 03 F7.