Honda GX390 QC9 Horizontal Engine is 390cc and puts out 11.7 HP. This Honda GX has a 1″ x 3-31/64″ crankshaft. The engine has a recoil starter, a cyclone air filter, a standard muffler and oil alert system. Honda GX390 commercial engines deliver economical and quiet operation without sacrificing superior performance and reliable power. Common applications for this engine include water pumps, small vehicles, commercial lawn and garden equipment, generators and more. Buyer protection package provides three-year commercial engine warranty. 50-State CARB Compliant. All engines purchased from us ship for free and are foam packed for added protection during transit.