It's a cold weather cover, you slip it over the hood of tractor. It restricts the air flow making the engine run warmer to prevent the carb from icing up. I use 5w-30 in the winter, makes the engine turn over much easier when it real cold.My MF1655 lived outside under a snow covered tarp for 26 years. Half an hour with the heat gun blowing warm air around the engine while I was tending fire in the garage was usually enough to get it going at -30*.
What's this bra thing? You guys got girl tractors or something? :ROF