Tuned up with Mercury Racing components to deliver blistering speed, the V8 4.6L 300R outboard delivers crisp throttle response, thrilling top-end power and confident control, the perfect match for a wide variety of high-performance boats. The 300R midsection and gearcase options, tie-bar and steering choices allow the creation of a near-custom configuration to provide optimal performance and ease of installation for most applications, including re-power upgrades.
The Mercury Racing 300R outboard is offered with three midsection choices, each designed for specific performance applications.
SHORT RUNNER INTAKE
To extract maximum performance, the Racing 300R is equipped with a Mercury Racing-designed short-runner intake, high-performance intake camshafts, an oil cooler and a performance-optimized ECU calibration that increases the WOT range to 6400 RPM.
Three gearcase options are available for the 300R outboard, each design for a specific high-performance application.
TIE-BAR OPTION
An optional rear tie-bar bracket integral to the Mercury Racing AMS provides a strong, ultra-light mounting point for precision steering in ultra-high-speed applications. 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.
The precision of Digital Throttle and Shift (DTS) with available Mercury Racing Digital Zero Effort controls eliminates cable maintenance and delivers smooth shifting with instant throttle response.
ADAPTIVE SPEED CONTROL
Adaptive Speed Control maintains engine RPM as load changes due to sea conditions or turning maneuvers to maintain boat authority with less control input.
SMARTCRAFT TECHNOLOGIES
The 500R model supports the full suite of Mercury SmartCraft technologies, including the Engine Guardian monitor system. Stream engine and performance data to a Mercury VesselView multi-function display or to many other multi-function displays.
MR_RseriesBrochure.pdf
