Replacement Patrol Boat Motor: Mercury 225HP 4-stroke Outboard Motor with XXL Shaft / Digital Throttle and Shift 1. Provide a new Mercury 225HP XXL DTS 4-stroke outboard motor direct shipped to the Barren River Project Office. Motor will be installed by a Mercury Authorized dealer to ensure warranty coverage. This motor shall be a direct replacement for a 2009 22' Guardian Boston Whaler.