Briggs Stratton 25T232-0037-F1 horizontal XR Professional Series engine is 420cc and puts out 21.0 gross torque. This XR has a 1″ x 3-31/64″ crankshaft with a 1/4″ keyway. Briggs Stratton XR Professional series engines are built with features like Magnetron electronic ignition and Dura-Bore cast iron sleeves to provide reliable power in even the most demanding situations. Common applications include tillers, pressure washers, water pumps, log splitters, portable generators and more. Buyer protection package provides two-year limited consumer engine warranty. 50-State CARB Compliant. All engines purchased from us ship for free and are foam packed for added protection during transit.