TOHATSU MFS 4C User manual

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MANUAL
OWNER’S
OB No.003-11111-2AF1
MFS 4C
MFS 5C
MFS 6C
Original instructions

ENOM00001-0
READ THIS MANUAL BEFORE USING THE OUTBOARD MOTOR. FAILURE TO FOLLOW THE
INSTRUCTIONS AND SAFETY PRECAUTIONS IN THIS MANUAL CAN RESULT IN SERIOUS
INJURY OR DEATH. KEEP THIS MANUAL IN A SAFE LOCATION FOR FUTURE REFERENCE.
Copyright © 2016 Tohatsu Corporation. All rights reserved. No part of this manual may be reproduced or
transmitted in any from or by any means without the express written permission of Tohatsu Corporation.

3
YOUR TOHATSU OUTBOARD MOTOR
ENOM00006-A
To You, Our Customer
Thank you for selecting a TOHATSU outboard motor. You are now the proud owner of an
excellent outboard motor that will service you for many years to come.
This manual should be read in its entirety and the inspection and maintenance procedures
described later in this manual should be followed carefully. Should a problem arise with the
outboard motor, please follow the troubleshooting procedures listed at the end of this
manual. If the problem persists, contact an authorized TOHATSU service shop or dealer.
Please always keep this manual together with the outboard motor as a reference to every-
one who uses the outboard motor. If the outboard motor is resold, make sure the manual
is passed on to the next owner.
We hope you will enjoy your outboard motor and wish you good luck in your boating
adventures.
TOHATSU CORPORATION
ENOM00113-0
EC DECLARATION OF CONFORMITY (DoC)
This product conforms to certain portion of the European Parliament directive. DoC con-
tains the following information;
zName and Address of the manufacturer.
zApplied community directives
zReference standard
zDescription of the product. (Model name and serial number)
zSignature of the responsible person (Name / Title / Date and place of issue).
ENOM00002-0
OWNER REGISTRATION AND IDENTIFICATION
Upon purchasing this product, be sure that the WARRANTY CARD is correctly and com-
pletely filled out and mailed to the addressee noted there on. This WARRANTY CARD
identifies you as the legal owner of the product and serves as your warranty registration.
TO THE EXTENT PERMITTED BY APPLICABLE LAW, YOUR OUTBOARD MOTOR WILL
NOT BE COVERED BY THE APPLICABLE LIMITED WARRANTY, IF THIS PROCEDURE IS
NOT FOLLOWED.
ENOM00003-0
PRE-DELIVERY CHECK
Be sure that the product has been checked by an authorized TOHATSU dealer before you
take delivery.

4
ENOM00005-A
Serial Number
In the space below, please record the outboard motor's serial number (indicated both on
the bottom cowl and on the cylinder block). The serial number will be needed when order-
ing parts, and when making technical or warranty inquiries.
Serial Number:
Serial Number: Date of purchase:
ENOF01500-0
ENOF01501-0

5
ENOM00007-0
NOTICE: DANGER/WARNING/CAUTION/Note
Before installing, operating or otherwise handling your outboard motor, be sure to thor-
oughly read and understand this Owner's Manual and carefully follow all of the instruc-
tions. Of particular importance is information preceded by the words “DANGER,”
“WARNING,” “CAUTION,” and “Note.” Always pay special attention to such information to
ensure safe operation of the outboard motor at all times.
ENOW00001-0
Failure to observe will result in severe personal injury or death, and possibly property dam-
age.
ENOW00002-0
Failure to observe could result in severe personal injury or death, or property damage.
ENOW00003-0
Failure to observe could result in personal injury or property damage.
ENON00001-0
Note
This instruction provides special information to facilitate the use or maintenance of the outboard
motor or to clarify important points.
DANGER
WARNING
CAUTION

1. GENERAL SAFETY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3. PARTS NAME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4. LABEL LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
1. Mounting the outboard motor on boat . . . . . . . . . . . . . . . . . . . . . . . . . . .20
2. Remote control device installation (option) . . . . . . . . . . . . . . . . . . . . . . . . 22
3. Battery installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6. PRE-OPERATING PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1. Fuel handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2. Fuel filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3. Engine oil recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
4. Break-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
5. Warning system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7. ENGINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Before starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
1. Fuel feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
2. Starting the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
3. Warming up the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
4. Forward, reverse, and acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
5. Stopping the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
6. Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
7. Trim angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
8. Tilt up and down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
9. Shallow water operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8. REMOVING AND CARRYING THE OUTBOARD MOTOR. . . . . . . . . . . . . . 43
1. Removing the outboard motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
2. Carrying the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3. Traillering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9. ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
1. Steering friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
2. Throttle grip friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
10. INSPECTION AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
1. Daily Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
2. Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3. Off-season storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4. Pre-season check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
5. Submerged outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
6. Cold weather precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
7. Striking underwater object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8. Auxiliary outboard motor operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
11. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
CONTENTS

12. ACCESSORIES KIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
13. PROPELLER TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

9
1 GENERAL SAFETY INFORMATION
2. SPECIFICATIONS
3. PARTS NAME
4. LABEL LOCATIONS
5. INSTALLATION
6. PRE-OPERATING PREPARATIONS
7. ENGINE OPERATION
8. REMOVING AND CARRYING THE
OUTBOARD MOTOR
9. ADJUSTMENT
10.INSPECTION AND MAINTENANCE
11.TROUBLESHOOTING
12.ACCESSORIES KIT
13.PROPELLER TABLE
INDEX
2
14
3
4
5
6
7
8
9
10
11
12
13
14
1

10
1
GENERAL SAFETY INFORMATION
ENOM00009-0
SAFE OPERATION OF BOAT
As the operator/driver of the boat, you are responsible for the safety of those aboard and
those in other boat around yours, and for following local boating regulations. You should
be thoroughly knowledgeable on how to correctly operate the boat, outboard motor, and
accessories. To learn about the correct operation and maintenance of the outboard motor,
please read through this manual carefully.
It is very difficult for a person standing or floating in the water to take evasive action should
he or she see a power boat heading in his/her direction, even at a slow speed. Therefore,
when your boat is in the immediate vicinity of people in the water, the outboard motor
should be shifted to neutral and shut off.
ENOW00005-0
SERIOUS INJURY IS LIKELY IF A PERSON IN THE WATER MAKES CONTACT WITH A MOV-
ING BOAT, GEAR HOUSING, PROPELLER, OR ANY SOLID DEVICE RIGIDLY ATTACHED TO
A BOAT OR GEAR HOUSING.
ENOM0008-A
EMERGENCY STOP SWITCH
The Emergency Stop Switch will stall the outboard motor when the stop switch lanyard is
pulled off. This stop switch lanyard has to be attached to the operator of the outboard
motor to minimize or prevent injuries from the propeller in case the operator falls over-
board.
It is operator’s responsibility to use the Emergency Stop Switch Lanyard.
ENOW00004-A
Accidental activation of the Emergency Stop Switch (such as the tether being pulled out in
heavy seas) could cause passengers to lose their balance and even fall overboard, or it
could result in loss of power in heavy seas, strong currents, or high winds. Loss of control
while mooring is another potential hazard.
To minimize accidental activation of the Emergency Stop Switch, the 500 mm (20 in.) stop
switch lanyard is coiled and can extended to a full 1300 mm (51 in.).
ENOM00800-A
PERSONAL FLOATATION DEVICE
As the operator/driver and passenger of the boat, you are responsible to wear a PFD (Per-
sonal Floatation Device) while on the boat.
WARNING
WARNING

GENERAL SAFETY INFORMATION 11
1
ENOM00010-0
SERVICING, REPLACEMENT PARTS & LUBRICANTS
We recommend that only an authorized service shop perform service or maintenance on
this outboard motor. Be sure to use genuine parts, genuine lubricants, or recommended
lubricants.
ENOM00011-A
MAINTENANCE
As the owner of this outboard motor, you should be acquainted with correct maintenance
procedures following maintenance section of this manual (See page 61). It is the opera-
tor's responsibility to perform all safety checks and to ensure that all lubrication and main-
tenance instructions are complied with for safe operation. Please comply with all
instructions concerning lubrication and maintenance. You should take the engine to an
authorized dealer or service shop for periodic inspection at the prescribed intervals.
Correct periodic maintenance and proper care of this outboard motor will reduce the
chance of problems and limit overall operating expenses.
Carbon Monoxide Poisoning Hazard
Exhaust gas contains carbon monoxide, a colorless and odorless gas which can be fatal if
inhaled for any length of time.
Never start or operate the engine indoors or in any space which is not well ventilated.
Gasoline
Gasoline and its vapors are very flammable and can be explosive. Use extreme care when
handling gasoline. You should be thoroughly knowledgeable on how to correctly handle
gasoline by reading this manual.

12
2
SPECIFICATIONS
ENOM00810-A
MODEL FEATURE
*1: Option
ENOM00811-A
MODEL NAME EXAMPLE
F 5 CDL
Model F4C F5C F6C F6C SP
Type (D) MF (D) MF MF (D) MF MF MF
Transom heights
Sz z z z z
Lz z z z z z
UL z
Tiller Handle z z z z z
Remote Control *1 (z) (z) (z) (z) (z) (z)
Separate fuel tank z z z
Dual fuel tank z z z
Mnual tilt z z z z z z
F 5 C D L
Model descrip-
tion Horse power Product generation Fuel tank Shaft length
F= Four stroke
D= Two stroke DI -A and up
D=Integral (Dual)
fuel tank
Blank=Separate
fuel tank
S= Short 15 in
L= Long 20 in
UL= Ultra long
25 in

SPECIFICATIONS 13
2
EENOM00401-0
*1:Equipped only for SP model, the other models OPTION.
*2:In case of dual fuel tank system, use it together with 12 L separate tank.
Remark: Specifications subject to change without notice.
*3 With propeller, with battery cable.
Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
MF
Item MODEL 4C(D) 5C(D) 6C(D)
(Dual Tank)
5C(S) 6C(S)
(Separate
Tank)
6C(S) SP
(Separate
Tank)
Overall Length mm (in) 783 (30.8)
Overall Width mm (in) 343 (13.5)
Overall Height S·L·UL mm (in)
Except for USA and Canada model
1053 (41.5) 1180 (46.5) 1307 (51.5) 1039 (40.9)
1166 (45.9)
1293 (50.9)
For USA and Canada model
1067 (42.0) 1194 (47.0) 1321 (52.0)
Transom Height S·L·UL mm (in) 435 (17.1) 562 (22.1) 689 (27.1)
Weight *3
S kg (lb) 26.1 (57.5) 25.6 (56.4)
L kg (lb) 26.6 (58.6) 26.1 (57.5)
UL kg (lb) 27.1 (59.8) 26.6 (58.6)
Output kW (ps) 4C : 2.9 (4) 5C : 3.68 (5) 6C : 4.4 (6)
Max. Operating Range min-1 (rpm) 4C & 5C : 4500–5500 6C : 5000–6000
Idle Speed in Forward Gear min-1 (rpm) 1100
Idle Speed in Neutral Gear min-1 (rpm) 1300
Engine Type 4-Stroke
Number of Cylinder 1
Bore × Stroke mm (in) 59 × 45 (2.32 × 1.77)
Piston Displacement cm3(Cu in) 123 (7.5)
Exhaust System Through hub exhaust
Cooling System Water cooling
Lubrication System Trochoid pump
Startring System Manual starter
Ignition System Ignitor
Spark Plug NGK DCPR6E
Alternator 12V 60W 5A (Max.) *1
Trim Position 6
Engine Oil mL (fl.oz.) API SH, SJ or SL FCW 10W-30/40, Approx. 450 (15.2)
Gear Oil mL (fl.oz.) Genuine Gear Oil or API GL5, SAE #80-90, Approx. 195 (6.6)
Fuel Unleaded regular gasoline : Pump posted 87 Octane
(research octane rating of 91)
Fuel Tank Capacity L (US gal) 1.15 (0.30) Integral *2 12 (3.17) Separate
Gear Reduction Ratio 2.15 (13 : 28)
Emission Control System EM (Engine modification)
Operator Sound Pressure
(ICOMIA 39/94) dB (A) 81.6
Hand Vibration Level
(ICOMIA 38/94) m/s27.2

14
3
PARTS NAME
ENOM00402-A
4C, 5C, 6C
1
2
45
6
7
8
910
11
12
13
14
15
16
17
18
19 20
21
22
26 27
28
3
23
24
25
ENOF01502-0
1 Tilt Handle
2 Top Cowl
3 Bottom Cowl
4 Cooling Water Check Port
5 Tilt Lever
6 Steering Adjustment Screw
7 Anode
8 Anti Ventilation Plate
9 Propeller
10 Oil Plug (Lower) (Fill)
11 Water Inlet
12 Oil Plug (Upper) (Level)
13 Thrust Rod
14 Clamp Bracket
15 Clamp Screw
16 Throttle Grip
17 Shift Lever
18 Starter Handle
19 Choke Knob
20 Stop Switch
21 Fuel Connector
22 Warning Lamp
23 Air Vent Screw
24 Fuel Connector
25 Fuel Cock
26 Engine Oil Filter Cap
27 Spark Plug
28 Engine Oil Drain Screw

PARTS NAME 15
3
3
1
2
4
5
6
7
8
10
9
14
13
12
11
ENOF01404-0
ENOM00822-0
Remote control box & Fuel tank
1 Control Lever
2 Neutral lock arm
3 PTT switch
4 Free throttle lever
5 Main switch
6 Stop switch
7 Stop switch lock
8 Stop switch lanyard
9 Fuel gauge
10 Air vent screw
11 Fuel tank cap
12 Fuel connector (Engine side)
13 Primer bulb
14 Fuel connector (Fuel tank side)

16
4
LABEL LOCATIONS
ENOM00019-A
Warning label locations
10
9
8
1, 2, 3
5
6
7
4
ENOF01503-0

LABEL LOCATIONS 17
4
1. Warning label urge to read the owner’s
manual.
2. Warning label regarding oil pressure
(See page 29).
3. Warning label regarding stop switch
(See page 37)
4. Warning regarding high temperature.
5. Warning label regarding position of
outboard motor when setting down.
6-1. Warning regarding emergency start-
ing (See page 34).
6-2. Warning regarding high temperature.
6-3. Warning regarding rotating object.
6-4. Warning regarding high voltage
7. Warning regarding fuel tank cap. (See
page 26) (Dual tank only)
8. Warning label regarding engine stop
switch.
9. Warning regarding gasoline (See
page 25).
ENOF00120-0
ENOF00131-0
ENOF00131-B
3GR-76191-0
ENOF00006-0
ENOF00005-R
1
2
3
4
ENOF02050-0
ENOF00008-0
ENOF00005-S

LABEL LOCATIONS18
4
10. Warning regarding gasoline (See
page 25).
ENOF00005-L