Also check the exhaust system. I sold an YM2610D a few years back and the owner called me after he had used it for about 5 hours and said it was smoking very heavy and had no power. I quick call to the distributor found that the internal parts of the muffler on these tractors sometimes collapses partially (they are 30 years old), or in my case completely. A partial blockage may cause some excess heating. Good luck! I hope it is just the gauge
