I recently began experiencing an issue with my '12 TNT 600 carb. The speedometer and odometer come and go, not working more often than working. Usually after the sled has sat for awhile they will work for a short period of time and then stop a few miles in. Sometimes they will start working again for a few minutes and then quit again a few miles later. If I stop the sled on the trail and restart it the speedometer cycles through it's range at start up as usual and then reads zero. This leads me to believe it to be the input to the speedo that is bad as I wouldn't think that the speedo would cycle if it was bad. Has anyone else experienced this problem and if so what was the cause. Thanks in advance.