Mercury News

26 Apr 2021


Standard with Power Steering and DTS with Available Integrated Rear Tie-Bar Bracket


FOND DU LAC, Wis. (April 26, 2021) – The Mercury Racing 300R outboard is now available with the Mercury Racing Advanced MidSection (Racing AMS).

The Mercury Racing AMS is designed expressly for high-performance Mercury Racing outboards and is also featured on the Mercury Racing 450R model. The Racing AMS heavy-duty guide plates and stiffened engine mounts to stabilize the engine for enhanced high-speed handling. An optional rear tie-bar bracket integral to the Racing AMS provides a strong, ultra-light mounting point for rock-solid, precision steering on catamaran and other ultra-high-speed applications. The Racing AMS also isolates the powerhead from the transom to ensure run quality is smooth and quiet at all speeds.

Available Joystick Piloting for Outboards (JPO) for boats rigged with two to six outboards provides intuitive, fingertip 360-degree boat control for docking and maneuvering in tight quarters plus the convenience of Skyhook® position-holding features and integrated auto piloting.

Designed, developed and manufactured in-house, the naturally aspirated Mercury Racing 300R is based on a 4.6L V-8 four-stroke powerhead, with four-valve cylinder heads and a double overhead camshaft valve train. To extract maximum performance, the Racing 300R is equipped with short-runner intake, high-performance intake camshafts, an oil cooler and a performance-optimized ECU calibration that increases the WOT range to 6400 rpm. The 64-degree V8 powerhead is covered by a slim-line cowl shaped to accommodate 26-inch center-to-center mounting on multi-engine transoms for seamless installations.

The industry-exclusive Top Cowl Service Door makes routine maintenance more efficient. A 115-amp belt-driven alternator is designed to maintain peak charging performance in the most demanding conditions. Exclusive Idle Charge battery management helps prevent battery drain on boats loaded with power-hungry electronics and audio systems by automatically increasing idle rpm to boost alternator output until batteries are recharged. Adaptive Speed Control (ASC) automatically maintains engine rpm as load or conditions change due to sea conditions, tight turns or at lower speed.

Advanced Range Optimization (ARO), a closed loop fuel-control system, utilizes electronic sensors to precisely adjust the fuel mixture for the best-possible efficiency at all speeds.

Mercury VesselView display can simultaneously monitor the rpm, speed, fuel flow and efficiency, temperature, trim and more on up to six outboards on an intuitive seven- or nine-inch touchscreen. The 300R with Racing AMS also enables Advanced Sound Control, a dual muffler system that can be toggled between an ultra-quiet mode and a deep sport tone with a stirring growl on start-up.

Two gearcase options are available for the 300R outboard with the Racing AMS: the surface-piercing Sport Master for boats capable of speeds over 136km/h, and the 5.44-inch HD gearcase for use on performance stepped-bottom center consoles where the application requires a broader, more submerged gearcase to generate lift.

The Mercury Racing 300R with the Racing AMS will be available in the EMEA from Q1 of 2022.