This is the Briggs & Stratton 13.5 HP 420cc Horizontal Shaft Engine 25T235-0111-G2.

This genuine 420cc Briggs and Stratton single cylinder engine offers dependable power designed for frequent use in demanding work environments.  With a power rating of 21 ft-lbs of gross torque, this engine features a premium Dual Clean air filtration system, electric with recoil backup starter, and maintenance-free Magnetron electronic ignition.

With a manufacturer limited warranty of 2 years consumer use / 1 year commercial use, Briggs and Stratton provides power that you can trust.  This engine includes a Dura-Bore cast iron cylinder sleeve for extended life.  This engine includes an installed muffler, a 9 amp charging system, a low-oil sensor, and a fuel tank. 

These engines are built with high-quality materials and advanced engineering to ensure long-lasting performance, dependability, and durability.