Take the lead and never look back with the Mercury Racing 300R outboard. Featuring a rock-solid 15-inch HD Conventional MidSection (HD CMS), this adrenaline-pumping V8 powerhouse brings modern R-Series four-stroke technology to high-performance sport, flat sand bass boats. Whether you’re replacing a high-output two-stroke or building your new dream machine, experience the ultimate fusion of breathtaking speed and control.
With a proven offshore pedigree, the HD CMS is built to exceed the most extreme boating demands. Heavy-duty forged transom brackets and a robust single-ram trim system with remote pump keep you running at the highest speeds through the most challenging conditions.
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Smaller footprint, same racing DNA—now available for boats that demand agility without sacrificing performance.
Gearcase, control and steering options – plus the expertise of the Mercury Racing team – allow you to configure your 300R outboard for near-custom performance.
Choose from hydraulic or power steering, with optional rear tie-bar mounting plates and side steering brackets.
Digital Throttle & Shift - smooth, effortless shifting and lightning-fast throttle response. Mechanical - full-feel controls for those who prefer traditional feedback and response.
Engineered for versatility, the 300R features two gearcase options tailored for specialized performance.
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Full Throttle RPM
5800
6400
RATED HP
300
CYLINDERS
V8
DISPLACEMENT
4.6 L
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Product Details
|
|
300 |
|---|---|
| SHAFT LENGTH | S: 15" / 381mm |
| FULL THROTTLE RPM | 5800-6400 RPM |
| IDLE RPM | 600 RPM |
| MOUNTS | Solid Upper and Solid One-Piece Lower Mounts |
| TRIM SYSTEM | Single Ram Trim and Tilt, Remote Pump |
| MAX TRIM RANGE | 20° (-5.3° to +14.7° on a 14° Transom) |
| MAX TILT RANGE | 72° |
| LIFT RANGE (MM) | N/A |
| TROLL CONTROL (RPM) | 550-1000RPM |
| MID SECTION | Heavy Duty Short Mid Section with Solid Mounts; Remote Trim Pump |
| ENGINE TYPE | V8 (32-valve, DOHC), Naturally Aspirated Four Stroke |
| WARRANTY | 3-Year Limited (Up to 5 Years Mercury Product Protection Available) |
| CORROSION WARRANTY | 3 Year Limited |
| RATED HP | 300 HP |
| RATED HP (KW) | 224 kW |
| BORE & STROKE (IN) | 3.62 x 3.39" |
| BORE & STROKE (MM) | 92 x 86mm |
| CYLINDERS / ENGINE CONFIGURATION | V8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves |
| DISPLACEMENT (L) | 4.6L |
| DISPLACEMENT (CID) | 279 CID |
| INDUCTION SYSTEM | Custom Racing Short-Runner Intake Manifold |
| COOLING SYSTEM | Water-cooled with thermostat |
| FUEL REQUIREMENT | Unleaded Regular 87 Octane Minimum (R+M/2) or 95 RON, 10% Ethanol Maximum |
| FUEL SYSTEM | Electronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization |
| IGNITION SYSTEM | SmartCraft PCM 112 Digital Inductive |
| ENGINE MANAGEMENT SYSTEM | SmartCraft PCM 112 with SmartCraft Engine Guardian |
| CHARGING SYSTEM | 85-amp (1071 Watt) with Idle Charge |
| CHARGING (AMP) | 85 amp |
| CHARGING (WATT) | 1071 watt |
| IDLE CHARGE | Yes |
| STARTING | Electric Start with SmartStart Protection |
| EXHAUST SYSTEM | Through prop |
| LUBRICATION SYSTEM | Integrated wet sump |
| OIL REQUIREMENT | Mercury Racing MRX 10w-30 Full Synthetic Recommended NMMA Certified FCW SAE 10W-30 |
| OIL CAPACITY (LITERS) | 6.6 Liters |
| OIL CAPACITY (QUARTS) | 7.0 Quarts |
| CARB STAR RATING | 3-Star |
| MINIMUM CENTERLINE MOUNTING DISTANCE (IN) | 26" |
| STEERING | Hydraulic or Power Compatible with side-steering and aft tie bars |
| STEERING ANGLE | +/- 30 degress |
| JPO OPTION | No |
| THROTTLE & SHIFT CONTROLS | Mechanical or Digital Throttle & Shift (DTS) |
| GEARCASE | Torque Master Sport Master |
| GEAR RATIO | Torque Master: 1.75 Sport Master: 1.60 or 1.75 |
| SKEG | Torque Master: Cambered Sport Master: Cambered or Straight |
| TIE BAR BRACKET OPTION | Yes |
| GEAR SHIFT | F-N-R |
| OVERDRIVE RATIO | N/A |
| OVERALL DRIVE RATIO | 1.75 |
| Dry Weight (LBS) | 545 |
| Dry Weight (KGS) | 247 |
Mercury Racing Propellers offer the ultimate in performance and durability. Our propeller artisans handcraft each prop into precision tuned works of art.
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