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I was riding back to the cabin after our last ride for the weekend and I got a ecu code for servo motor failure and a exhaust valve code. It went into a limp mode and I nursed it into a bar while others went on to get the truck and trailer. I got it home and cleaned the exhaust valves and checked the cables for movement put everything back together per service manual. The code went away but it is still stuck in limp mode. It starts and runs fine and when I try to go it gets up to about 5500 rpm and starts stuttering like a rev limiter. I put new plugs in, it has the same gas everyone else fueled up with and the guage I believe shows red color. Took it to dealer and they plugged it in and can't find any codes and are supposed to be talking with arctic cat. It has been at the dealer for quite some time now and they are chasing their tail on it. Any Ideas? If I would have had the time I would have went through it myself but being new to cat I thought they could just fix it and i would be back on the snow. Thanks!