SHAFT SIZE: (D x L). 1-1/8" X 4" (To mounting base on crankcase cover). Many different horizontal shaft engines that use the same shaft size. The item "21.5HP GX660 TXF Honda Horizontal Shaft Twin Cylinder Engine 1-1/8 Shaft" is in sale since Wednesday, February 5, 2020. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Multi-Purpose Engines". The seller is "smallenginesforless" and is located in Albany, Indiana. This item can be shipped to United States.