Last weekend we were out in perfect conditions and sled would only run to 7100 on tach. It had 1000 miles on it and is stock other than set screws. It always ran around 7800 or 7900 up until then. When I got back I cleaned the exhaust valves, believe me they were in a terrible mess, and then took it for a short run and ran 7900 consistantly on tach. Now, today we went for a 200 mile run and it's back to 7100 again with the same conditions. Also, the tail light is not working. Just wondering if anyone might know if the park light and the exhaust servo could be on the same circuit? Maybe has nothing to do with it but I was just wondering. Any insight would be greatly appreciated. Thanks...