Yamaha Outboard - F20SWHB. 15-Inch Shaft Yamaha Gray Tiller Handle Manual & Electric Start. Product Overview. The Yamaha F20SWHB Outboard in Yamaha Gray brings reliable 20HP FourStroke power to a portable package designed for small boats. With its 15-inch short shaft and tiller handle steering, it delivers exceptional maneuverability for jon boats, dinghies, skiffs, and inflatables.. Powered by a 2-cylinder SOHC engine with Electronic Fuel Injection (EFI), the F20SWHB offers smooth throttle response, excellent fuel economy, and quiet running. Dual manual and electric start options give you the convenience of push-button ignition with the security of a backup.. Key Features. Factory Yamaha Gray corrosion-resistant finish. 20 horsepower SOHC engine with EFI for smooth, fuel-efficient performance. 15-inch (S) shaft designed for shallow-transom boats. Tiller handle for direct, precise control. Manual & electric start options for added reliability. Lightweight, portable design for easy inst