This is the Briggs & Stratton 10.5 HP 344cc Vertical Shaft Engine 21R707-0143-F1.
Our E1050 10.5 Gross HP engines offer an excellent power to weight ratio. This ensures that you get maximum performance without sacrificing comfort and useability. The model 21R707-0143-F1 boasts 344 CC, a 3.44 in. (87.38 mm) bore, and 2.26 in. (57.40 mm) stroke sending power to a robust 1 in by 3-5/32 shaft. Your new Briggs and Stratton engine is backed by a history of excellence as well as a very competitive warranty.