• Mercury Racing Launches All-New 250R and 300R Outboard Engines

    All New 250R & 300R Outboards Powerful. Fast. Efficient.

    FOND DU LAC, Wis. (May 18, 2018) – Mercury Racing is pleased to debut all-new 250R and 300R outboards.

    Designed, developed and manufactured in-house, the naturally aspirated, 4.6L V-8 four-stroke engines share Mercury Racing’s venerable Quad Cam Four Valve (QC4) sterndrive DNA – complete with aluminum four-valve cylinder heads and dual overhead camshaft (DOHC) valve train. The four-valve heads and DOHC valve train is integrated with Mercury’s proprietary V-8 cylinder block, packed with high-performance hardware. The new platform replaces the two-stroke V-6 250XS and 300XS models.


    No Replacement for Displacement The stout V-8 powerhead provides an astounding 44% in increased displacement compared to the legacy two-strokes. That, combined with four valves per cylinder and the DOHC valve train, enables the new four-strokes to generate unprecedented torque and unmatched acceleration from the lower end of the power band up to maximum engine speed. All of this on 87-octane (90 RON) pump fuel while maintaining a comparable weight as their legacy two-stroke cousins. The weight savings can be attributed to the state-of-the-art powerhead components including composite intake runners. Both models are backed by a three-year factory warranty.


    Repower Marvels Models accept either traditional throttle and shift cables or DTS (Digital Throttle & Shift). Throttle and shift actuation handled electronically on the engine for both traditional and DTS rigging, replaces the lag and hesitation of mechanical throttle and shift cables with digital precision, resulting in smooth shifting and instant throttle response.

    The availability of either rigging system enhances the repower versatility of the engine.


    250R
    The 250R pumps out 250 prop shaft horsepower and much higher torque than the 250XS it replaces. The efficient and durable Sport Master gearcase, in the correct application – will enhance boat handling, top speed and efficiency.

    300R
    The 300R is the most powerful engine in its class. The 300R powerhead features Racing specified intake cam shafts, valves and an exclusive short runner intake manifold. An integrated oil cooler keeps oil temps down throughout the Racing exclusive 5800-6400 rpm operating range. A multitude of models with two midsections and three gearcase options in varying shaft lengths are available to revolutionize nearly any boating experience.




    Mercury Racing 300R Full Specifications

    RATED HORSEPOWER (HP/KW)
    300/224
    BORE & STROKE (IN/MM)
    3.6 X 3.4/92 x 96
    IDLE RPM
    600
    MAX RPM AT FULL THROTTLE
    5800-6400
    CYLINDERS/ENGINE CONFIGURATION
    V-8 (64 degree) with 32-valve Dual Overhead Cam (DOHC)
    DISPLACEMENT (LITER/CID)
    4.6/279
    INDUCTION SYSTEM
    Custom Racing Short-Runner Intake Manifold
    FUEL SYSTEM
    Electronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization
    FUEL REQUIREMENTS
    Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
    IGNITION SYSTEM
    SmartCraft PCM 112 Digital Inductive
    CHARGING SYSTEM
    85-amp (1071 Watt) with idle Charge
    STARTING
    Electric Start with SmartStart Protection
    LUBRICATION SYSTEM
    Integrated wet sump
    OIL REQUIREMENT
    NMMA Certified FCW SAE 10W-30
    THROTTLE AND SHIFT CONTROLS
    Mechanical and Digital Throttle and Shift (DTS)
    TRI-RAM MIDSECTION
    High-Durometer Elastomer Upper Mount and Solid Lower Mounts
    HEAVY DUTY MIDSECTION
    Solid Mounts; Remote Trim System
    GEARCASE
    Torque Master, Sport Master or 5.44" HD
    GEAR RATIO
    1.75:1
    CAMBERED SKEG
    Sport Master and Torque Master
    GEAR SHIFT
    F-N-R
    DRY WEIGHT (LBS./KG)
    L - 20"
    Std: 512/232; HD: 546/247
    XL - 25"
    556/252
    XXL - 30"
    566/257
    WARRANTY
    3-Year Warranty



    About Mercury Racing
    Based in Fond du Lac, Wis., Mercury Racing, a division of Mercury Marine, is a leading provider of high-performance marine propulsion systems for discriminating boaters worldwide, offering an exciting and fulfilling power boating experience on the water. Using leading-edge technology, Mercury Racing produces high-performance outboards, sterndrives, propellers, parts and accessories. Mercury Racing also produces crate engines for the automotive aftermarket industry. Mercury Marine is a division of Brunswick Corp. (NYSE: BC), the world’s largest manufacturer of recreational products, including pleasure boats, marine engines, fitness equipmentand billiards.
    Comments 1 Comment
    1. harrells's Avatar
      harrells -
      What is the difference between STD. and HD. 512 lbs. and 546 lbs. I have a 2-stroke 250 XS with 20" mid and sportmaster gearcase at 505 lbs. Can I get the 300R at 512 lbs with same mid and gearcase?
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