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General| Horsepower | 300 hp |
|---|---|
| Displacement | 4.6L |
| Fuel Type | Gasoline |
| Gear Ratio | 1.75:1 |
| Engine Type | 4-Stroke |
| Propeller Shaft Length | 25 inches |
| Starting System | Electric |
| Cylinder Configuration | V6 |
| Fuel Induction | Electronic Fuel Injection |
| Steering | Hydraulic |
| Shaft Length | 25 inches |
Outlines the operator's duties for safe boat operation and occupant safety.
Guide to choosing the correct propeller for optimal performance and preventing engine damage.
Explains the function and importance of the lanyard stop switch for operator safety.
Details risks associated with striking underwater objects and safety precautions.
Provides key technical specifications for the 300R HD model.
Instructions on the correct and safe method for trailering the boat and outboard.
Details acceptable fuel types, octane ratings, and precautions for gasoline.
Specifies recommended engine oils for optimal performance and protection.
Step-by-step guide on how to check and add engine oil correctly.
Explains the automatic engine speed adjustment for enhanced control and performance.
Describes the engine warning horn signals and their meanings for operator alerts.
Details the operation and adjustments of the power trim and tilt system for boat handling.
Essential pre-operation checks to ensure the outboard is safe and ready for use.
A comprehensive checklist for preparing the engine and boat before starting.
Crucial steps for breaking in a new engine to ensure longevity and performance.
Step-by-step instructions for safely starting the outboard engine.
Proper procedures for shifting gears to prevent damage and ensure safe operation.
Instructions on how to safely shut down the outboard engine.
Outlines required maintenance tasks and their intervals for optimal performance and safety.
Procedure for flushing internal water passages to prevent clogging and corrosion.
Comprehensive guide for changing engine oil and filter to maintain engine health.
Instructions for checking, draining, and filling gearcase lubricant for proper protection.
Procedures for preparing the outboard for seasonal or prolonged storage to prevent damage.
Steps to protect internal engine parts from rust and corrosion during storage.
Guidelines for proper storage and maintenance of the boat battery.
Identifies potential causes and solutions when the starter motor fails to crank the engine.
Lists possible reasons and corrective actions for an engine that fails to start.
Common causes and troubleshooting steps for an engine operating inconsistently.
Addresses factors causing reduced engine performance and how to resolve them.
Diagnoses issues related to the battery not retaining charge and potential causes.
Information on obtaining service from authorized Mercury dealers for expert repairs.
Guidance on contacting dealers and customer service for problem resolution.
Information and contact details for ordering additional manuals and literature.
A section to record all performed maintenance work for future reference.
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