Mercury 20 FourStroke User Manual

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Welcome Aboard!
Proper care and maintenance is an important part in keeping
your Mercury Product operating at peak efficiency for
maximum performance and economy. The enclosed Owner's
Registration Card is your key to trouble‑free family fun. Refer
to your Operation and Maintenance Manual for full details
of your warranty coverage.
Details of your nearest dealer can be found on
www.marinepower.com where country maps and full
contact information are displayed.
Is your engine properly registered for warranty purpose?
Please check on www.marinepower.com. If necessary,
please contact your local dealer.
Declaration of Conformity
This outboard motor's serial number plate contains in the
lower left hand corner the CE mark. This outboard motor
manufactured by Mercury Marine, Fond du Lac, Wisconsin,
USA or Marine Power Europe Inc., Park Industriel, de
Petit‑Rechain, Belgium complies with the requirements of the
following directives by meeting the associated standards, as
amended:
Recreational Craft Directive:
2003/44/EC amending 94/25/EC
Owner's manual (A.2.5) ISO 10240
Handling characteristics (A.4) ISO 8665
Outboard engine starting (A.5.1.4) ISO 11547
Fuel tanks (A.5.2.2) ISO 13591; ISO 8469
General steering system (A.5.4.1) ABYC P‑17
Exhaust emission requirements (B.
2)
ISO 8178
Owner's manual (B.4) ISO 8665
Noise emission levels (C.1) ISO 14509
The notified body responsible for EC‑Type Examination for the engine
exhaust emissions assessment under Modules B+C of Directive 2003/44/
EC and for noise emission assessment under Module Aa of Directive
2003/44/EC is:
© 2008 Mercury Marine 15/20 FourStroke 90-10252081 108

Mercury 20 FourStroke Specifications

General

Engine Type	4-Stroke
Power	20 HP
Cylinders	2
Full Throttle RPM Range	5000-6000 RPM
Steering	Tiller
Fuel System	EFI
Alternator Output	12 Amp
Shaft Length	20 in

Summary

Warranty Information

FourStroke Outboard Limited Warranty: Regions

Coverage details for US, Canada, Europe, and CIS.

FourStroke Outboard Limited Warranty: MEA

Coverage details for Middle East & Africa.

3-Year Corrosion Warranty

Warranty coverage against corrosion for three years.

Warranty Coverage & Exclusions

Explanation of what is and is not covered by the warranty.

Fuel & Oil Recommendations

Gasoline Recommendations

Guidance on selecting appropriate gasoline and octane ratings.

Engine Oil Type

Recommended engine oil types and viscosity.

Outboard Operation

Pre-Start Checklist

Essential checks before starting the engine.

Engine Break-in Guide

Steps for breaking in the new engine correctly.

Starting Engine (Tiller Handle)

Procedure for starting with a tiller handle.

Starting Engine (Remote Control)

Procedure for starting with a remote control.

Gear Shifting Procedures

Instructions for shifting gears safely.

Stopping the Engine

Procedures for safely shutting down the engine.

Emergency Starting

Methods for starting the engine in an emergency.

Maintenance Schedule & Procedures

Inspection & Maintenance Schedule

Recommended inspection and maintenance intervals.

Cooling System Flushing

How to flush the cooling system with fresh water.

Propeller Replacement Guide

Step-by-step guide for replacing the propeller.

Spark Plug Service

Engine Oil Change

Gearcase Lubrication

Outboard Storage

Storage Preparation Steps

Troubleshooting Guide

Starter Motor Not Cranking

Engine Won't Start

Erratic Engine Performance

Engine Performance Loss

Engine Installation

Boat Horsepower Limits

Guidelines on matching engine horsepower to boat capacity.

Outboard Mounting Instructions