21.0 GHP Horizontal Shaft Engine. The item "Briggs and Stratton 25T237-0045-F1 21.0 GHP Horizontal Shaft Engine" is in sale since Monday, January 14, 2019. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Lawn Mowers, Parts & Accessories\Lawn Mower Parts". The seller is "outdoor_power_direct" and is located in Columbus, Ohio. This item can be shipped to United States.