This is the 31Q777 18.5 HP Briggs engine that was removed from the mower listed below. This engine starts and runs very well. It is a 2008 year model. I did not work it hard. I did not open and inspect this engine. It does not seem to smoke or knock. The specifications are as follows: model: 31Q777 , Type: 0136 G1 , Code: 080819ZD. This engine includes the starter and air cleaner. It does not include the fuel tank or muffler. It has a 1 crankshaft. Failure to add oil before starting may potentially ruin the engine. Remember: This is a used engine. Please evaluate pics carefully! Briggs and Stratton 18.5 hp. These parts are used and contain the normal light rust, scuffs, scratches and moderate wear that you would expect to find on parts taken from a used unit. The item “Used Craftsman Briggs and Sratton 18HP Engine fits DYT4000″ is in sale since Friday, December 02, 2016. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Lawnmowers\Parts & Accessories”. The seller is “pilgrimhere171″ and is located in Berlin Center, Ohio. This item can be shipped to United States.