Mercury FourStroke 4 User manual

eng 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.
© 2012 Mercury Marine 4/5/6 FourStroke 90-8M0055686 211

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Warranty Message
The product you have purchased comes with a limited warranty
from Mercury Marine, the terms of the warranty are set forth in
the Warranty Information section of this manual. The warranty
statement contains a description of what is covered, what is not
covered, the duration of coverage, how to best obtain warranty
coverage, important disclaimers and limitations of damages,
and other related information. Please review this important
information.
The description and specifications contained herein were in
effect at the time this manual was approved for printing. Mercury
Marine, whose policy is one of continued improvement, reserves
the right to discontinue models at any time, to change
specifications, designs, methods, or procedures without notice
and without incurring obligation.
Mercury Marine, Fond du Lac, Wisconsin U.S.A.
Litho in U.S.A.
© 2011, Mercury Marine
Mercury, Mercury Marine, MerCruiser, Mercury MerCruiser,
Mercury Racing, Mercury Precision Parts, Mercury Propellers,
Mariner, Quicksilver, #1 On The Water, Alpha, Bravo, Pro Max,
OptiMax, Sport‑Jet, K‑Planes, MerCathode, RideGuide,
SmartCraft, Zero Effort, M with Waves logo, Mercury with Waves
logo, and SmartCraft logo are all registered trademarks of
Brunswick Corporation. Mercury Product Protection logo is a
registered service mark of Brunswick Corporation.
Mercury Premier Service
Mercury evaluates the service performance of its dealers and
assigns its highest rating of "Mercury Premier" to those
demonstrating an exceptional commitment to service.
Earning a Mercury Premier Service rating means a dealer:
• Achieves a high 12 month service CSI (Customer
Satisfaction Index) score for warranty service.
• Possesses all necessary service tools, test equipment,
manuals, and parts books.
• Employs at least one Certified or Master technician.

eng iii
• Provides timely service for all Mercury Marine customers.
• Offers extended service hours and mobile service, when
appropriate.
• Uses, displays, and stocks adequate inventory of genuine
Mercury Precision Parts.
• Offers a clean, neat shop with well organized tools and
service literature.
Declaration of Conformity ‑ For Recreational Craft Propulsion
Engines with the Requirements of Directive 94/25/EC as
amended by 2003/44/EC
Name of engine manufacturer: Tohatsu Marine Corporation (TMC) Mercury
Marine Joint Venture
Address: Shimodaira 4495‑9
Town: Komagane‑City,
Nagano Post Code: 399‑4101 Country: Japan
Name of Authorized Representative: Brunswick Marine in EMEA Inc.
Address: Parc Industriel de Petit‑Rechain
Town: Verviers Post Code: B‑2800 Country: Belgium
Name of Notified Body for exhaust emission assessment: Det Norske
Veritas AS
Address: Veritasveien 1
Town: Hovik Post Code:
1322
Country:
Norway ID Number: 0575
Name of Notified Body for noise emission assessment: Det Norske
Veritas AS
Address: Veritasveien 1
Town: Hovik Post Code:
1322
Country:
Norway ID Number: 0575

iv eng
Conformity assessment
module used for exhaust
emissions:
☐ B
+C
☐ B
+D
☐ B
+E
☐ B
+F ☐ G☒ H
or engine type approved
according to:
☐ Stage II of
Directive 97/68/EC
☐ Directive
88/77/EC
Conformity assessment
module used for noise
emissions:
☐ A☐ Aa ☐ G☒ H
Other Community Directives applied: Safety of Machinery Directive
98/37/EC; Electromagnetic Compatibility Directive 2004/108/EC
Description of Engines and Essential Requirements
Engine Type Fuel Type Combustion Cycle
☐ z or sterndrive without integral exhaust ☐ Diesel ☐ 2 stroke
☒ Outboard engine ☒ Petrol ☒ 4 stroke
Identification of Engines Covered by This Declaration of
Conformity
Name of engine family
Unique engine identification
number: starting serial
number
EC Module H
certificate number
4 hp, 5 hp, 6 hp 0R332614 RCD‑H‑2
8 hp, 9.9 hp 0R334339 RCD‑H‑2
9.9 hp BigFoot 0R334339 RCD‑H‑2

eng v
Essential
requirements Standards
Other
normative
document/
method
Technical
file
Please specify in
more detail
(* = mandatory
standard)
Annex 1.B—Exhaust Emissions
B.1 engine
identification ☐ ☐ ☒
B.2 exhaust
emission
requirements
☒* ☐ ☐ * EN ISO
8178‑1:1996
B.3 durability ☐ ☐ ☒
B.4 owner's
manual ☒ ☐ ☐ ISO 8665: 1995
Annex 1.C—Noise Emissions
C.1 Noise
emission levels ☒* ☐ ☐ EN ISO 14509
C.2 Owner's
manual ☐ ☒ ☐ Owner's manual
This declaration of conformity is issued under the sole responsibility of the
manufacturer. I declare on behalf of the engine manufacturer that the engines
mentioned preceding complies with all applicable essential requirements in
the way specified.
Name / function:
Mark D. Schwabero, President,
Mercury Outboard
Date and place of issue:
July 24, 2008
Fond du Lac, Wisconsin, USA

vi eng

eng vii
WARRANTY INFORMATION
Warranty Registration.................................................................. 1
Transfer of Warranty.................................................................... 2
Transfer of Mercury Product Protection (Extended Service
Coverage) Plan United States and Canada.................................2
FourStroke Outboard Limited Warranty....................................... 3
FourStroke Outboard Limited Warranty....................................... 7
FourStroke Outboard Limited Warranty..................................... 11
3 Year Limited Warranty Against Corrosion.............................. 15
Warranty Coverage and Exclusions.......................................... 18
U.S. EPA Emissions Limited Warranty...................................... 20
Emission Control System Components..................................... 20
California Emissions Limited Warranty...................................... 21
California Air Resources Board Explanation of Your California
Emission Control Warranty Statement.......................................25
Emission Certification Star Label............................................... 26
GENERAL INFORMATION
Boater's Responsibilities............................................................ 28
Before Operating Your Outboard............................................... 28
Boat Horsepower Capacity........................................................ 29
Lanyard Stop Switch.................................................................. 29
Protecting People in the Water.................................................. 32
Exhaust Emissions.................................................................... 32
Selecting Accessories for Your Outboard.................................. 34
Safe Boating Suggestions......................................................... 35
Recording Serial Number.......................................................... 37
4/5/6 Specifications....................................................................37
INSTALLATION
Installing Outboard.....................................................................39

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TRANSPORTING
Carrying, Storing, and Transporting Your Outboard When
Removed from Boat................................................................... 40
Trailering Your Boat................................................................... 41
FUEL AND OIL
Fuel Recommendations............................................................. 43
Low Permeation Fuel Hose Requirement ................................. 45
EPA Pressurized Portable Fuel Tank Requirements................. 45
Fuel Demand Valve (FDV) Requirement................................... 45
Mercury Marine's Pressurized Portable Fuel Tank.................... 46
Filling Fuel Tank........................................................................ 47
Engine Oil Recommendations................................................... 48
Checking Engine Oil.................................................................. 49
FEATURES AND CONTROLS
Features and Controls............................................................... 51
Tilting Outboard......................................................................... 53
Shallow Water Operation .......................................................... 54
Setting the Operating Angle of Your Outboard ......................... 56
Engine Overspeed Protection System....................................... 56
OPERATION
Prestarting Check List................................................................57
Operating in Freezing Temperatures......................................... 57
Operating in Saltwater or Polluted Water.................................. 58
Engine Break‑in Procedure........................................................58
Starting the Engine.................................................................... 58
Gear Shifting ............................................................................. 63
Stopping the Engine ................................................................. 64
Emergency Starting................................................................... 64

eng ix
MAINTENANCE
Outboard Care........................................................................... 67
EPA Emission Regulations........................................................ 67
Inspection and Maintenance Schedule...................................... 68
Flushing the Cooling System..................................................... 70
Top Cowl Removal and Installation........................................... 70
Corrosion Control Anode........................................................... 71
Exterior Care..............................................................................72
Fuel System............................................................................... 72
Propeller Replacement.............................................................. 73
Spark Plug Inspection and Replacement...................................75
Lubrication Points...................................................................... 76
Changing Engine Oil ................................................................. 79
Gearcase Lubrication.................................................................80
Submerged Outboard................................................................ 82
STORAGE
Storage Preparation...................................................................83
Protecting External Outboard Components............................... 83
Protecting Internal Engine Components.................................... 84
Gearcase................................................................................... 84
Positioning Outboard for Storage.............................................. 84
OWNER SERVICE ASSISTANCE
Local Repair Service..................................................................86
Service Away from Home.......................................................... 86
Parts and Accessories Inquiries................................................ 86
Service Assistance.................................................................... 86
Mercury Marine Service Offices.................................................87
MAINTENANCE LOG
Maintenance Log....................................................................... 89

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WARRANTY INFORMATION
eng 1
Warranty Registration
UNITED STATES AND CANADA
To be eligible for warranty coverage, the product must be
registered with Mercury Marine.
At the time of sale, the selling dealer should complete the
warranty registration and immediately submit it to Mercury
Marine via MercNET, e‑mail, or mail. Upon receipt of this
warranty registration, Mercury Marine will record the registration.
A copy of the warranty registration should be provided to you by
your selling dealer.
NOTE: Registration lists must be maintained by Mercury Marine
and any dealer on marine products sold in the United States,
should a safety recall notification under the Federal Safety Act
be required.
You may change your address at any time, including at time of
warranty claim, by calling Mercury Marine or sending a letter or
fax with your name, old address, new address, and engine serial
number to Mercury Marine’s warranty registration department.
Your dealer can also process this change of information.
Mercury Marine
Attn: Warranty Registration Department
W6250 W. Pioneer Road
P.O. Box 1939
Fond du Lac, WI 54936-1939
920-929-5054
Fax [phone]
OUTSIDE UNITED STATES AND CANADA
For products purchased outside the United States and Canada,
contact the distributor in your country, or the Marine Power
Service Center closest to you.

WARRANTY INFORMATION
2 eng
Transfer of Warranty
UNITED STATES AND CANADA
The limited warranty is transferable to a subsequent purchaser,
but only for the remainder of the unused portion of the limited
warranty. This will not apply to products used for commercial
applications.
To transfer the warranty to the subsequent owner, send or fax a
copy of the bill of sale or purchase agreement, new owner’s
name, address, and engine serial number to Mercury Marine’s
warranty registration department. In the United States and
Canada, mail to:
Mercury Marine
Attn: Warranty Registration Department
W6250 W. Pioneer Road
P.O. Box 1939
Fond du Lac, WI 54936-1939
920-929-5054
Fax [phone]
Upon processing the transfer of warranty, Mercury Marine will
record the new owner's information.
There is no charge for this service.
OUTSIDE THE UNITED STATES AND CANADA
For products purchased outside the United States and Canada,
contact the distributor in your country, or the Marine Power
Service Center closest to you.
Transfer of Mercury Product Protection (Extended
Service Coverage) Plan United States and Canada
The remaining coverage period of the Product Protection Plan is
transferable to the subsequent purchaser of the engine within
thirty (30) days from the date of sale. Contracts not transferred
within thirty (30) days of the subsequent purchase will no longer
be valid and the product will no longer be eligible for coverage
under the terms of the contract.

WARRANTY INFORMATION
eng 3
To transfer the plan to the subsequent owner, contact Mercury
Product Protection or an authorized dealer to receive a Request
for Transfer form. Submit to Mercury Product Protection a
receipt/bill of sale, a completed Request of Transfer form, and a
check payable to Mercury Marine in the amount of $50.00 (per
engine) to cover the transfer fee.
Plan coverage is not transferable from one product to another
product or for non‑eligible applications.
The Certified Pre‑Owned engine plans are not transferable.
For help or assistance, contact Mercury Product Protection
Department at 1‑888‑427‑5373 from 7:30 a.m. to 4:30 p.m. CST,
Monday–Friday or email [email protected].
FourStroke Outboard Limited Warranty
UNITED STATES AND CANADA
Outside the United States and Canada ‑ Check with your local
distributor.
WHAT IS COVERED: Mercury Marine warrants its new products
to be free of defects in material and workmanship during the
period described below.

WARRANTY INFORMATION
4 eng
DURATION OF COVERAGE: This Limited Warranty provides
coverage for three (3) years from the date the product is first sold
to a recreational use retail purchaser, or the date on which the
product is first put into service, whichever occurs first.
Commercial users of these products receive warranty coverage
of one (1) year from the date of first retail sale, or one (1) year
from the date on which the product was first put into service,
whichever occurs first. Commercial use is defined as any work or
employment related use of the product, or any use of the product
which generates income, for any part of the warranty period,
even if the product is only occasionally used for such purposes.
The repair or replacement of parts, or the performance of service
under this warranty, does not extend the life of this warranty
beyond its original expiration date. Unexpired warranty coverage
can be transferred from one recreational use customer to a
subsequent recreational use customer upon proper reregistration
of the product. Unexpired warranty coverage cannot be
transferred either to or from a commercial use customer.
Warranty coverage may be terminated for used repossessed
product; or product purchased at auction, from a salvage yard, or
from an insurance company.
CONDITIONS THAT MUST BE MET IN ORDER TO OBTAIN
WARRANTY COVERAGE: Warranty coverage is available only
to retail customers that purchase from a Dealer authorized by
Mercury Marine to distribute the product in the country in which
the sale occurred, and then only after the Mercury Marine
specified predelivery inspection process is completed and
documented. Warranty coverage becomes available upon proper
registration of the product by the authorized dealer. Inaccurate
warranty registration information regarding recreational use, or
subsequent change of use from recreational to commercial
(unless properly reregistered) may void the warranty at the sole
discretion of Mercury Marine. Routine maintenance outlined in
the Operation and Maintenance Manual must be timely
performed in order to maintain warranty coverage. Mercury
Marine reserves the right to make warranty coverage contingent
upon proof of proper maintenance.

WARRANTY INFORMATION
eng 5
WHAT MERCURY WILL DO: Mercury's sole and exclusive
obligation under this warranty is limited to, at our option,
repairing a defective part, replacing such part or parts with new
or Mercury Marine certified remanufactured parts, or refunding
the purchase price of the Mercury product. Mercury reserves the
right to improve or modify products from time to time without
assuming an obligation to modify products previously
manufactured.
HOW TO OBTAIN WARRANTY COVERAGE: The customer
must provide Mercury with a reasonable opportunity to repair,
and reasonable access to the product for warranty service.
Warranty claims shall be made by delivering the product for
inspection to a Mercury dealer authorized to service the product.
If purchaser cannot deliver the product to such a dealer, written
notice must be given to Mercury. We will then arrange for the
inspection and any covered repair. Purchaser, in that case, shall
pay for all related transportation charges and/or travel time. If the
service provided is not covered by this warranty, purchaser shall
pay for all related labor and material, and any other expenses
associated with that service. Purchaser shall not, unless
requested by Mercury, ship the product or parts of the product
directly to Mercury. Proof of registered ownership must be
presented to the dealer at the time warranty service is requested
in order to obtain coverage.

WARRANTY INFORMATION
6 eng
WHAT IS NOT COVERED: This limited warranty does not cover
routine maintenance items, tune‑ups, adjustments, normal wear
and tear, damage caused by abuse, abnormal use, use of a
propeller or gear ratio that does not allow the engine to run in its
recommended wide‑open throttle RPM range (see the Operation
and Maintenance Manual), operation of the product in a manner
inconsistent with the recommended operation/duty cycle section
of the Operation and Maintenance Manual, neglect, accident,
submersion, improper installation (proper installation
specifications and techniques are set forth in the installation
instructions for the product), improper service, use of an
accessory or part not manufactured or sold by us, jet pump
impellers and liners, operation with fuels, oils, or lubricants which
are not suitable for use with the product (see the Operation and
Maintenance Manual), alteration or removal of parts, water
entering the engine through the fuel intake, air intake or exhaust
system, or damage to the product from insufficient cooling water
caused by blockage of the cooling system by a foreign body,
running the engine out of water, mounting the engine too high on
the transom, or running the boat with the engine trimmed out too
far. Use of the product for racing or other competitive activity, or
operating with a racing type lower unit, at any point, even by a
prior owner of the product, voids the warranty.
Expenses related to haul‑out, launch, towing, storage, telephone,
rental, inconvenience, slip fees, insurance coverage, loan
payments, loss of time, loss of income, or any other type of
incidental or consequential damages are not covered by this
warranty. Also, expenses associated with the removal and/or
replacement of boat partitions or material caused by boat design
for access to the product are not covered by this warranty.
No individual or entity, including Mercury Marine authorized
dealers, has been given authority by Mercury Marine to make
any affirmation, representation, or warranty regarding the
product, other than those contained in this limited warranty, and
if made, shall not be enforceable against Mercury Marine.

WARRANTY INFORMATION
eng 7
For additional information regarding events and circumstances
covered by this warranty, and those that are not, see the
Warranty Coverage section of the Operation and Maintenance
Manual, incorporated by reference into this warranty.
DISCLAIMERS AND LIMITATIONS:
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE EXPRESSLY DISCLAIMED. TO THE
EXTENT THAT THEY CANNOT BE DISCLAIMED, THE IMPLIED
WARRANTIES ARE LIMITED IN DURATION TO THE LIFE OF THE
EXPRESS WARRANTY. INCIDENTAL AND CONSEQUENTIAL DAMAGES
ARE EXCLUDED FROM COVERAGE UNDER THIS WARRANTY. SOME
STATES/COUNTRIES DO NOT ALLOW FOR THE DISCLAIMERS,
LIMITATIONS AND EXCLUSIONS IDENTIFIED ABOVE, AS A RESULT,
THEY MAY NOT APPLY TO YOU. THIS WARRANTY GIVES YOU
SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER LEGAL
RIGHTS WHICH VARY FROM STATE TO STATE AND COUNTRY TO
COUNTRY.
FourStroke Outboard Limited Warranty
EUROPE AND CONFEDERATION OF INDEPENDENT
STATES
Outside Europe and Confederation of Independent States ‑
check with local distributor.
WHAT IS COVERED: Mercury Marine warrants its new products
to be free of defects in material and workmanship during the
period described below.

WARRANTY INFORMATION
8 eng
DURATION OF COVERAGE: This Limited Warranty provides
coverage for two (2) years from the date the product is first sold
to a recreational use retail purchaser, or the date on which the
product is first put into service, whichever occurs first.
Commercial users of these products receive warranty coverage
of one (1) year from the date of first retail sale, or one (1) year
from the date in which the product was first put into service,
whichever occurs first. Commercial use is defined as any work or
employment related use of the product, or any use of the product
which generates income, for any part of the warranty period,
even if the product is only occasionally used for such purposes.
The repair or replacement of parts, or the performance of service
under this warranty, does not extend the life of this warranty
beyond its original expiration date. Unexpired warranty coverage
can be transferred from one recreational use customer to a
subsequent recreational use customer upon proper reregistration
of the product. Unexpired warranty coverage cannot be
transferred either to or from a commercial use customer.
Warranty coverage may be terminated for used or repossessed
product; or product purchased at auction, from a salvage yard, or
from an insurance company.
CONDITIONS THAT MUST BE MET IN ORDER TO OBTAIN
WARRANTY COVERAGE: Warranty coverage is available only
to retail customers that purchase from a Dealer authorized by
Mercury Marine to distribute the product in the country in which
the sale occurred, and then only after the Mercury Marine
specified predelivery inspection process is completed and
documented. Warranty coverage becomes available upon proper
registration of the product by the authorized dealer. Routine
maintenance outlined in the Operation and Maintenance Manual
must be timely performed in order to maintain warranty
coverage. Mercury Marine reserves the right to make future
warranty coverage contingent on proof of proper maintenance.

WARRANTY INFORMATION
eng 9
WHAT MERCURY WILL DO: Mercury’s sole and exclusive
obligation under this warranty is limited to, at our option,
repairing a defective part, replacing such part or parts with new
or Mercury Marine certified remanufactured parts, or refunding
the purchase price of the Mercury product. Mercury reserves the
right to improve or modify products from time to time without
assuming an obligation to modify products previously
manufactured.
HOW TO OBTAIN WARRANTY COVERAGE: The customer
must provide Mercury with a reasonable opportunity to repair,
and reasonable access to the product for warranty service.
Warranty claims shall be made by delivering the product for
inspection to a Mercury dealer authorized to service the product.
If purchaser cannot deliver the product to such a dealer, written
notice must be given to Mercury. We will then arrange for the
inspection and any covered repair. Purchaser in that case shall
pay for all related transportation charges and/or travel time. If the
service provided is not covered by this warranty, purchaser shall
pay for all related labor and material, and any other expenses
associated with that service. Purchaser shall not, unless
requested by Mercury, ship the product or parts of the product
directly to Mercury. Proof of registered ownership must be
presented to the dealer at the time warranty service is requested
in order to obtain coverage.

WARRANTY INFORMATION
10 eng
WHAT IS NOT COVERED: This limited warranty does not cover
routine maintenance items, tune‑ups, adjustments, normal wear
and tear, damage caused by abuse, abnormal use, use of a
propeller or gear ratio that does not allow the engine to run in its
recommended wide‑open throttle RPM range (see the Operation
and Maintenance Manual), operation of the product in a manner
inconsistent with the recommended operation/duty cycle section
of the Operation and Maintenance Manual, neglect, accident,
submersion, improper installation (proper installation
specifications and techniques are set forth in the installation
instructions for the product), improper service, use of an
accessory or part not manufactured or sold by us, jet pump
impellers and liners, operation with fuels, oils or lubricants which
are not suitable for use with the product (see the Operation and
Maintenance Manual), alteration or removal of parts, or water
entering the engine through the fuel intake, air intake or exhaust
system, or damage to the product from insufficient cooling water
caused by blockage of the cooling system by a foreign body,
running the engine out of water, mounting the engine too high on
the transom, or running the boat with the engine trimmed out too
far. Use of the product for racing or other competitive activity, or
operating with a racing type lower unit, at any point, even by a
prior owner of the product, voids the warranty.
Expenses related to haul out, launch, towing, storage, telephone,
rental, inconvenience, slip fees, insurance coverage, loan
payments, loss of time, loss of income, or any other type of
incidental or consequential damages are not covered by this
warranty. Also, expenses associated with the removal and/or
replacement of boat partitions or material caused by boat design
for access to the product are not covered by this warranty.
No individual or entity, including Mercury Marine authorized
dealers, has been given authority by Mercury Marine to make
any affirmation, representation or warranty regarding the
product, other than those contained in this limited warranty, and
if made, shall not be enforceable against Mercury Marine.