Mercury 25 Series User Manual

i
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

Mercury 25 Series Specifications

General

Gear Ratio	2.08:1
Horsepower	25 HP
Steering	Tiller
Shaft Length	15 in, 20 in
Starting	Manual
Full Throttle RPM Range	5000- RPM
Fuel Type	Gasoline

Summary

Warranty Information

Transfer of Warranty

Warranty Registration

Outboard Limited Warranty

Explains the terms and coverage duration of the standard limited warranty.

3 Year Limited Warranty Against Corrosion

Specific warranty coverage for corrosion damage over a three-year period.

Warranty Coverage and Exclusions

Clarifies what services and damages are covered and excluded by the warranty.

General Exclusions from Warranty

General Information

Boater Responsibilities and Safe Operation

Operator duties, safety basics, pre-operation checks, and understanding the manual.

Boat Handling and Safety Precautions

Guidance on horsepower, operation, controls, steering, lanyard safety, and hazard avoidance.

Specific Hazards and Emissions

Installation

Installing Outboard

Remote Control Device Installation

Battery Installation

Fuel & Oil

Fuel Recommendations and Types

Guidelines on gasoline types, octane ratings, and oxygenated fuels.

Oil Recommendation and Mixing

Specifies recommended oil and fuel/oil mixing ratios for engine operation.

Fuel Tank Filling Procedures

Instructions for safely filling fuel tanks, including permanent and portable types.

Features & Controls

Tilting Outboard

Shallow Water Operation

Trim Adjustment

Operation

Pre-Operation and Environmental Conditions

Covers pre-start checks and operation in specific temperatures and water conditions.

Engine Operation and Performance

Starting Procedures

Step-by-step guide for starting the engine, including lanyard switch use.

Warm-Up and Shifting

Stopping and Emergency Starting

Instructions on how to stop the engine and procedures for emergency starts.

Maintenance

General Care and Regulations

Inspection and Maintenance Schedule

Routine checks before/after use and at specified hour/month intervals.

System Maintenance Procedures

Engine Component Maintenance

Details on spark plugs, lubrication, gearcase, and submerged outboard care.

Storage

Storage Preparation

Troubleshooting

Starting System Issues

Diagnosing problems like starter not cranking or engine not starting.

Engine Performance Problems

Troubleshooting erratic engine running, performance loss, and battery charge issues.

Owner Service Assistance

Local Repair Service