I have been having problems with my exhaust vlaves. After 1600 miles they stuck and the cables came off the servo. I removed the valves and cleaned them on a wire wheel, reoiled the valves with synthetic APV, replaced 1 new cable, lubed the other cable, and adjusted both accordingly. Also noticed to get the min. adjustment out of the cables they need to be maxed out. I rode the sled approx. 100 miles evrything ok, next ride 120 miles, temp around zero all day and the valves stuck. I had to pull the valve covers and spray carb cleaner in to free them up. The sled runs ok, a little hasitation after idle. After a 127 mile ride yesterday the oil reservoir was down about 3", and no problems. Any ideas?