Briggs & Stratton 44S977-0033-G1 vertical Professional Series engine is 724cc and puts out 24.0 gross HP. This Briggs & Stratton V-Twin has a 1-1/8″ x 4-5/16″ crankshaft. The engine has a 12V electric start with 16A alternator. A muffler and wiring harness are not included, but options are available for sale on our website. Briggs & Stratton Professional Series engines deliver the reliable, efficient power needed for riding lawn mowers and tractors. Buyer protection package provides a two-year limited consumer warranty. 50-State CARB Compliant. All engines purchased from us ship for free and are foam packed for added protection during transit.