I'm running a new to me 13 pro RMK. Been having issues with it reaching peak RPM, since I've owned it, it's never pulled tach higher than 8000. Today it at 8000 ft with 10-60 weights it would only pull 7450-7500 rpm. I noticed that there was a check engine light on stating 173-3 or high voltage exhaust temp sensor. Could this be keeping me from. Holding tach where I am supposed to be? I'm pretty lost, I haven't checked my secondary spring or anything inside the secondary yet, but everything in the primary looks great. I hate missing out on the peak horsepower because it makes riding super difficult. Any help is appreciated.