"I have a 7 year old Troy built horse Xp. This past week, it has started running very very loud. IT will backfire sometimes and gray smoke will come from the front and there is a lot of heat coming from under the hood. It also just feels like it is running hard. It still mows, but its almost unbearably loud. ..." The only thing I have done is put sea foam in the gas and oil. Any advice would much appreciated.
