I recently bought a gas 706 that had been sitting for 10 years. Filed and set the points and rebuilt the carb to get it running. Tractor runs good. I hooked it to a roller the other day and after about 15 minutes the outside of the plugs had turned chalky white and the boots were burning off them. Engine temp showed around 210. Turned the key off and it continued to run. It seemed starving for power but still ran smooth. Let it cool and it still runs good I m thinking extremely lean. I did remove the anti diesel fuel shut off needle off the valve because the coil was stuck shut from sitting. Any idea on what I can do or check. I tried it again yesterday but didn t load it as hard. Plugs still got hot but would turn off with the key. Thanks