Yamaha F150XSA4 Outboard Motor. 25-Inch Shaft Digital Electronic Control (DEC) Electric Start Power Trim & Tilt Classic White. ⚠️ Important: This is a Digital Electronic Control (DEC) engine and must be installed by an authorized Yamaha dealer. Both the outboard and the DEC control system require flashing and configuration with Yamaha diagnostic tools during installation. DIY installation is not supported.. The Yamaha F150XSA4 Outboard Motor delivers the precision of Yamaha's Digital Electronic