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Mercury 25M

Mercury 25M
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Thank You
for your purchase of one of the finest outboards available. You
have made a sound investment in boating pleasure. Your
outboard has been manufactured by Mercury Marine, a world
leader in marine technology and outboard manufacturing
since 1939. These years of experience have been committed
to the goal of producing the finest quality products. This led to
Mercury Marine's reputation for strict quality control,
excellence, durability, lasting performance and being the best
at providing after the sale support.
Please read this manual carefully before operating your
outboard. This manual has been prepared to assist you in the
operation, safe use and care of your outboard.
All of us at Mercury Marine took pride in building your outboard
and wish you many years of happy and safe boating.
Again, thank you for your confidence in Mercury Marine.
EPA Emissions Regulations
Outboards sold by Mercury Marine in the United States are
certified to the United States Environmental Protection
Agency as conforming to the requirements of the regulations
for the control of air pollution from new outboard motors. This
certification is contingent on certain adjustments being set to
factory standards. For this reason, the factory procedure for
servicing the product must be strictly followed and, wherever
practicable, returned to the original intent of the design.
Maintenance, replacement, or repair of the emission
control devices and systems may be performed by any
marine engine repair establishment or individual.
Engines are labeled with an Emission Control Information
decal as permanent evidence of EPA certification.
!
WARNING
The engine exhaust from this product contains chemicals
known to the state of California to cause cancer, birth defects
or other reproductive harm.
© 2008 Mercury Marine 25/30 2-Stroke 90-10261080 1008

Table of Contents

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Mercury 25M Specifications

General IconGeneral
Fuel TypeGasoline
Horsepower25 hp
Starting SystemManual
Full Throttle RPM Range5000-6000
SteeringTiller
Shaft Length15", 20"

Summary

WARRANTY INFORMATION

Outboard Limited Warranty

Details on what Mercury Marine warrants regarding material and workmanship defects.

3 Year Limited Warranty Against Corrosion

Details of the warranty coverage for corrosion-related issues on the engine.

INSTALLATION

FEATURES & CONTROLS

OPERATION

Engine Breakin Procedure

Detailed procedure for breaking in the engine to ensure proper performance and longevity.

Starting the Engine

Step-by-step guide for starting the engine, including preparations and procedures for different temperatures.

Gear Shifting

Instructions for shifting the outboard into forward and reverse gears, emphasizing safe RPM levels.

Stopping the Engine

Procedures for safely stopping the engine using the stop switch or lock.

Emergency Starting

Procedure for starting the engine using a spare starter rope if the primary system fails.

MAINTENANCE

Flushing the Cooling System

Procedure for flushing the cooling system with fresh water to prevent deposits.

Propeller Replacement

Safety warnings and step-by-step instructions for removing and installing the propeller.

Spark Plug Inspection and Replacement

Procedure for inspecting, replacing, and gapping spark plugs for optimal engine performance.

Gearcase Lubrication

Instructions for checking, draining, and refilling gearcase lubricant, including identifying signs of wear.

Submerged Outboard

Emergency measures to take if the outboard is submerged to minimize internal corrosion damage.

Inspection and Maintenance Schedule

Schedule of checks to perform before each use for proper engine starting and system integrity.

Fuel System

Safety warning about fuel flammability and procedures for servicing the fuel system.

STORAGE

TROUBLESHOOTING

Starter Motor Will Not Crank The Engine (Electric Start Models)

Possible causes and solutions for the starter motor not cranking the engine.

Engine Will Not Start

Common reasons and troubleshooting steps when the engine fails to start.

OWNER SERVICE ASSISTANCE

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