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The 300R FourStroke is the highest performing engine in its class. The naturally aspirated 4.6L V-8 provides an astounding 44% in increased displacement and up to 40% higher overall bottom end torque than the legacy two-stroke 300XS it replaces. Custom Racing intake cam profiles and short intake manifold runners maximize power throughout the rated speed range. An integrated oil cooler keeps oil temps down throughout the Racing exclusive 5800-6400 rpm operating range. Transient spark calibration boosts torque by 7% for unmatched acceleration. Advanced Range Optimization automatically adjusts fuel delivery for up to 10% improvement in cruise-speed fuel efficiency. All of this on 87-octane (90 RON) pump fuel while maintaining a comparable weight as it’s legacy two-stroke cousin. Best of all, the 300R is backed by a three-year factory warranty.

Primary

20, 25, or 30

SHAFT LENGTH

Standard or Heavy Duty

TRIM SYSTEM

Standard, Heavy Duty or Racing AMS

MID SECTION

Camber or Straight

SKEG

SHOW MORE

3-Year²

WARRANTY

3.6 x 3.4 IN/92 x 86 MM

BORE & STROKE

Custom Racing Short-Runner Intake Manifold

INDUCTION SYSTEM

Unleaded Regular 87 Octane Minimum (R+M/2) Or 90 RON 10% Ethanol Maximum

FUEL REQUIREMENT

Electronic Fuel Injection (EFI) Computer Controlled With Advanced Range Optimization

FUEL SYSTEM

Digital Inductive

IGNITION SYSTEM

115 (AMS) / 85 (CMS)

CHARGING

Yes

IDLE CHARGE

Electric Start With SmartStart Protection

STARTING

NMMA Certified FCW SAE 10W-30

OIL REQUIREMENT

N (CMS), Optional (AMS)

JPO OPTION

DTS (AMS), DTS or Mechanical (CMS)

THROTTLE & SHIFT CONTROLS

Torque Master, Sport Master or 5.44 HD

GEARCASE

1.85 (AMS), 1.75:1 (CMS) or 1.60:1 (CMS, AMS)

GEAR RATIO

512 LBS

DRY WEIGHT

3

CARB STAR RATING

26

MINIMUM CENTERLINE MOUNTING DISTANCE (IN)

Electro-Hydraulic Power Steering

STEERING

Integrated (AMS), Bracket (CMS)

TIE BAR OPTION

SHOW LESS
DETAILS

The 300R FourStroke is the highest performing engine in its class. The naturally aspirated 4.6L V-8 provides an astounding 44% in increased displacement and up to 40% higher overall bottom end torque than the legacy two-stroke 300XS it replaces. Custom Racing intake cam profiles and short intake manifold runners maximize power throughout the rated speed range. An integrated oil cooler keeps oil temps down throughout the Racing exclusive 5800-6400 rpm operating range. Transient spark calibration boosts torque by 7% for unmatched acceleration. Advanced Range Optimization automatically adjusts fuel delivery for up to 10% improvement in cruise-speed fuel efficiency. All of this on 87-octane (90 RON) pump fuel while maintaining a comparable weight as it’s legacy two-stroke cousin. Best of all, the 300R is backed by a three-year factory warranty.

Specifications
Primary

20, 25, or 30

SHAFT LENGTH

Standard or Heavy Duty

TRIM SYSTEM

Standard, Heavy Duty or Racing AMS

MID SECTION

Camber or Straight

SKEG

SHOW MORE

3-Year²

WARRANTY

3.6 x 3.4 IN/92 x 86 MM

BORE & STROKE

Custom Racing Short-Runner Intake Manifold

INDUCTION SYSTEM

Unleaded Regular 87 Octane Minimum (R+M/2) Or 90 RON 10% Ethanol Maximum

FUEL REQUIREMENT

Electronic Fuel Injection (EFI) Computer Controlled With Advanced Range Optimization

FUEL SYSTEM

Digital Inductive

IGNITION SYSTEM

115 (AMS) / 85 (CMS)

CHARGING

Yes

IDLE CHARGE

Electric Start With SmartStart Protection

STARTING

NMMA Certified FCW SAE 10W-30

OIL REQUIREMENT

N (CMS), Optional (AMS)

JPO OPTION

DTS (AMS), DTS or Mechanical (CMS)

THROTTLE & SHIFT CONTROLS

Torque Master, Sport Master or 5.44 HD

GEARCASE

1.85 (AMS), 1.75:1 (CMS) or 1.60:1 (CMS, AMS)

GEAR RATIO

512 LBS

DRY WEIGHT

3

CARB STAR RATING

26

MINIMUM CENTERLINE MOUNTING DISTANCE (IN)

Electro-Hydraulic Power Steering

STEERING

Integrated (AMS), Bracket (CMS)

TIE BAR OPTION

SHOW LESS
Primary

20, 25, or 30

SHAFT LENGTH

Standard or Heavy Duty

TRIM SYSTEM

Standard, Heavy Duty or Racing AMS

MID SECTION

Camber or Straight

SKEG

3-Year²

WARRANTY

3.6 x 3.4 IN/92 x 86 MM

BORE & STROKE

Custom Racing Short-Runner Intake Manifold

INDUCTION SYSTEM

Unleaded Regular 87 Octane Minimum (R+M/2) Or 90 RON 10% Ethanol Maximum

FUEL REQUIREMENT

Electronic Fuel Injection (EFI) Computer Controlled With Advanced Range Optimization

FUEL SYSTEM

Digital Inductive

IGNITION SYSTEM

115 (AMS) / 85 (CMS)

CHARGING

Yes

IDLE CHARGE

Electric Start With SmartStart Protection

STARTING

NMMA Certified FCW SAE 10W-30

OIL REQUIREMENT

N (CMS), Optional (AMS)

JPO OPTION

DTS (AMS), DTS or Mechanical (CMS)

THROTTLE & SHIFT CONTROLS

Torque Master, Sport Master or 5.44 HD

GEARCASE

1.85 (AMS), 1.75:1 (CMS) or 1.60:1 (CMS, AMS)

GEAR RATIO

512 LBS

DRY WEIGHT

3

CARB STAR RATING

26

MINIMUM CENTERLINE MOUNTING DISTANCE (IN)

Electro-Hydraulic Power Steering

STEERING

Integrated (AMS), Bracket (CMS)

TIE BAR OPTION

Options

All prices reflect MSRP in U.S. dollars and are applicable in the US only. Dealer sets the actual price. Pricing does not Include dealer preparation fees, taxes, registration fees, that may apply. See participating dealer for details.

300R

1. Choose Your Colors

Base Engine Color

Phantom Black

Cold Fusion White

Accent Panel Color

Devil Eye Red

Carbon Fiber

Graphite Grey

2. Choose A Gear Cases

  1. Torque Master

    The Torque Master gearcase is designed for heavier boats capable of hitting the 85 mph mark and features a heavy-duty 19-spline stainless steel propshaft. Torque Master

  2. Sport Master

    The surface piercing Sport Master gearcase delivers race-proven performance for boats capable of speeds exceeding 85 mph, with low water pick-ups and a crescent leading edge to maximize efficiency and speed. Sport Master

  3. 5.44 HD

    The 5.44'' Offshore HD gearcase was designed for submerged applications in the most demanding offshore environments and features a larger 5.44'' diameter torpedo that provides extra lift for heavier boats. 5.44 HD

3. Choose A Midsection

Racing Exclusive

  1. HD Midsection

    The HD CMS features heavy-duty forged transom brackets and a robust single-ram trim system with a remote pump, and optional rear tie-bar mounting plates and side steering brackets.

  2. Standard Midsection

    The durable Mercury Racing CMS for 20-inch models features the integral Tri-Ram trim system.

  3. Racing Advanced MidSection

    Mercury Racing Advanced MidSection (Racing AMS) features heavy-duty guide plates, Digital Throttle and Shift (DTS) control and Mercury electro-hydraulic power steering, and optional integrated rear tie-bar brackets and Joystick Piloting for Outboards (JPO).

  4. Racing Advanced MidSection

    Mercury Racing Advanced MidSection (Racing AMS) features heavy-duty guide plates, Digital Throttle and Shift (DTS) control and Mercury electro-hydraulic power steering, and optional integrated rear tie-bar brackets and Joystick Piloting for Outboards (JPO).

4. Choose Your Performance Package

Integrated System

  1. Rear Tie Bar Bracket

    Select HD CMS models are available with optional rear tie-bar mounting plates and side steering brackets for high speed applications when using the Sport Master gearcase. Rear Tie Bar Bracket

  2. Integrated Rear Tie Bar

    An optional rear tie-bar bracket integral to the Racing AMS provides a strong, ultra-light mounting point for precision steering in ultra-high-speed applications. Integrated Rear Tie Bar

5. Choose Your Shaft Length

Length (inches)

  1. 20

  2. 25

  3. 30


5.SUMMARY


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