TOHATSU M 6B User manual

OWNER’S
MANUAL
トーハツ船外機オーナーズマニュアル
Original instructions
M B
M .B
OB No.--NBB
M B
EN

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 © 2022 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
ENOM00006-2
To You, Our Customer
Congratulations on your purchase of the TOHATSU outboard motor. You are now the
proud owner of an excellent outboard motor that will serve you for many years to come.
This owner's manual contains important safety, operational and maintenance informa-
tion.
The efficiency and longevity of your outboard motor will depend heavily on your oper-
ating methods and periodic maintenance. Failure to operate and maintain your out-
board motor according to the instruction in this owner's manual may void the limited
warranty, as well as reduce the efficiency and reliability of the outboard motor.
Any person operating TOHATSU outboard motor must carefully read and fully under-
stand the entire contents of this manual prior to operation. For safety, follow all safety
warnings contained within the owner's manual and the labels applied to your outboard
motor. You should keep this owner's manual where accessible while operating your out-
board motor. If the outboard motor is resold, make sure the manual is passed on to the
next owner. In case you encounter any problems, please contact an authorized
TOHATSU service shop or dealer for assistance.
Tohatsu Corporation reserves the right to change, modify, add, or remove a part or
whole of the owner’s manual without prior notice and incurring any obligations.
We are excited to take a part in your boating adventures and wish for your great and
safe boating experience.
TOHATSU CORPORATION
ENOM00003-1
PRE-DELIVERY INSPECTION
Make sure Pre-delivery inspection has been properly done by authorized TOHATSU
dealer before operating your outboard motor.

4
ENOM00113-1
DECLARATION OF CONFORMITY (DoC)
This product conforms to certain portion of the European Parliament directive and UK
Regulations. DoC contains the following information;
zName and Address of the manufacturer, EU - notified body, EU - authorized repre-
sentative, and UK - approved body.
zApplied community directives and regulations
zReference standard
zDescription of the product. (model name and serial number)
zSignature of the responsible person (name / title / date and place of issue).
ENON00937-0
Note
For CE marked model
The Outboard engine is intended to install on non-recreational craft within the European Union
because it has not been confirmed compliance with requirement of Directive 2013/53/EU.
ENOM00005-1
Serial Number
Your outboard motor has a unique serial number. The serial number is identification of
outboard motor and is located on the outboard motor as shown in the figures below.
The serial number is required for warranty registration, filing a warranty claim as well as
making technical inquiries and may be required for other occasions.Therefore, please
write down the serial number and date of purchase in the space below.
Serial Number:
Serial Number: Date of purchase:
ENOF02200-1ENOF02200-1
ENOF02201-1

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 damage.
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1. Mounting the outboard motor on boat . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2. Battery installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6. PRE-OPERATING PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1. Fuel handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2. Fuel filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3. Engine oil recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4. Break-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7. ENGINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Before starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1. Fuel feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2. Starting the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3. Warming up the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4. Forward, reverse, and acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5. Stopping the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6. Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
7. Trim angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8. Tilt up and down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9. Shallow water operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8. REMOVING AND CARRYING THE OUTBOARD MOTOR. . . . . . . . . . . . . . . . . . . 42
1. Removing the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
2. Carrying the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3. Trailering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9. ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
1. Steering friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2. Throttle grip friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3. Trim tab adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
10. INSPECTION AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
1. Daily Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
2. Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3. Off-season storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
4. Pre-season check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5. Submerged outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6. Cold weather precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7. Striking underwater object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8. Auxiliary outboard motor operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
CONTENTS

11. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
12. TOOL KIT AND SPARE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
13. PROPELLER TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

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. TOOL KIT AND SPARE PARTS
13. PROPELLER TABLE
INDEX
2
1
3
4
5
6
7
8
9
10
11
12
13
1
1

10
1
GENERAL SAFETY INFORMATION
ENOM00009-1
SAFE OPERATION OF BOAT
As the operator/driver of a 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 out-
board motor, please read through this manual carefully.
It is very difficult for a person 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 out-
board motor must be shifted to neutral and shut off.
ENOW00005-0
SERIOUS INJURY IS LIKELY IF A PERSON IN THE WATER MAKES CONTACT WITH A MOVING BOAT,
GEAR HOUSING, PROPELLER, OR ANY SOLID DEVICE RIGIDLY ATTACHED TO A BOAT OR GEAR
HOUSING.
ENOM00247-1
STOP SWITCH LANYARD
The engine can be stopped by pulling out the stop switch lock from the stop switch. The
stop switch lanyard is the coiled red cord with the stop switch lock on one end and a
metal clip on the other end. With attaching the stop switch lanyard to the operator's
body part or operator’s personal flotation device (PFD), the engine will stop when the
stop switch lanyard is being stretched and pulled out the lock from the switch if the
operator accidentally falls overboard or leaves from operator’s position. This function
may prevent losing control of the boat and minimize or prevent risk of collision with
other boats, people and other objects. It is operator’s responsibility to use the stop
switch lanyard.
ENOW00004-1
Accidental activation of the 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 Stop Switch, the 500 mm (20 inch.) stop switch lan-
yard is coiled and can extended to a full 1300 mm (51 inch.).
ENOM00800-A
PERSONAL FLOTATION DEVICE
As the operator/driver and passenger of a boat, you are responsible to wear a PFD (Per-
sonal Flotation Device) while on the boat.
WARNING
WARNING

GENERAL SAFETY INFORMATION 11
1
ENOM00010-1
SERVICING , REPLACEMENT PARTS & LUBRICANTS
We recommend that only an authorized service shop perform service or maintenance
on your outboard motor. Be sure to use genuine parts, genuine lubricants, or recom-
mended lubricants. Be aware that the installation and use of parts not approved by
Tohatsu Corporation will void warranty and may lead to unsafe operating conditions.
ENOM00011-1
MAINTENANCE
As the owner of the outboard motor, you should be acquainted with correct mainte-
nance procedures following by maintenance section of this manual (See page 62). It is
the operator's responsibility to perform all safety inspections, proper lubrication and to
follow all maintenance instructions for safe operation. 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 outboard motor will reduce the
chance of problems, limit overall operating expenses and contribute to longevity of your
outboard motor.
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-B
MODEL FEATURE
*1 Option
ENOM00811-C
MODEL NAME EXAMPLE
M9.8B EFL
Model M6B M8B M9.8B
Type MF MF MF EF
Transom heights
Sz z z z
Lz z z z
UL z
Tiller Handle z z z z
Remote Control (z)*1 (z)*1 (z)*1 (z)*1
Manual tilt z z z z
M9.8 B E F L
Model description Horse
power
Product
generation
Starter
system
Steering
system
Shaft
length
M(X)= Two stroke -A and up E= Electrical
start
M= Manual start
P=Remote control
(Pleasure)
F=Tiller handle
(Fisher)
S= Short 15 in
L= Long 20 in
UL= Ultra long
25 in

SPECIFICATIONS 13
2
ENOM01500-0
Remark: Specifications are subject to change without notice.
* : With manual starter.
Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
6B MF, 8B MF, 9.8B MF, 9.8B EF
Item MODEL 6B MF 8B MF 9.8B MF 9.8B EF
Overall Length mm (in) 793 (31.2)
Overall Width mm (in) 320 (12.6)
Overall Height
S mm (in) 996 (39.2)
L mm (in) 1123 (44.2)
UL mm (in) 1250 (49.2)
Transom Height
S mm (in) 435 (17.2)
L mm (in) 562 (22.2)
UL mm (in) 689 (27.1)
Weight
S kg (lb) 26 (57) 29 (64)
L kg (lb) 27 (60) 30 (66)
UL kg (lb) 28 (62) -
Output kW (ps) 4.4 (6) 5.9 (8) 7.2 (9.8)
Max. Operating Range min
-1
(rpm) 4500-5500 5000-6000
Trolling Speed in Forward Gear min
-1
(rpm) 750
Idle Speed in Neutral Gear min
-1
(rpm) 950
Number of Cylinder 2
Bore x Stroke mm (in) 50 x 43 (1.97 x 1.69)
Piston Displacement cm3(Cu in) 169 (10.3)
Exhaust System Through hub exhaust
Cooling System Forced water cooling
Lubrication System Engine Oil Mixed Gasoline
Starting System Manual Electric starter motor*
Ignition System Flywheel Magneto C.D. Ignition
Spark Plug BPR7HS-10
Trim Position 6
Fuel Unleaded Regular Gasoline : R+M/2: 87 or higher RON: 91 or higher
Fuel Tank Capacity L (US gal) 12 (3.17)
Engine Oil Genuine motor oil or recommended one (TCW-III)
Fuel : Engine Oil Mixing Ratio Unleaded Gasoline 50 : Genuine 2-stroke Engine Oil 1
Gear Oil mL (fl.oz) Genuine Gear Oil or API GL5, SAE #80 to #90, approx. 320 (10.8)
Gear Reduction Ratio 2.08 (13 : 27)
Operator Sound Pressure (ICOMIA 39/94) dB (A) 84.4
Hand Vibration Level (ICOMIA 38/94) m/s
2
2.7

14
3
PARTS NAME
ENOM01501-0
6B MF, 8B MF, 9.8B MF
ENOF02203-0
6
1
2
3
4
5
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1 Tilt Handle
2 Top Cowl
3 Bottom Cowl
4 Cooling Water Check Port
5 Tilt Stopper
6 Drive Shaft Housing
7 Water Plug
8 Anti-Ventilation Plate
9 Anode / Trim Tab
10 Propeller
11 Starter Handle
12 Shift Lever
13 Throttle Grip
14 Clamp Screw
15 Clamp Bracket
16 Thrust Rod
17 Oil Plug (Upper)
18 Water Inlet
19 Oil Plug (Lower)
20 Stop Switch
21 Choke Knob
22 Fuel Connector
23 Spark Plug
24 Fuel Filter

PARTS NAME 15
3
ENOM01502-0
9.8B EF
ENOF02204-0
6
1
2
3
4
5
7
8
9
10
11
12
13
14
15
16
17
18
19
21
2220
23
24
25
26
1 Tilt Handle
2 Top Cowl
3 Bottom Cowl
4 Cooling Water Check Port
5 Tilt Stopper
6 Drive Shaft Housing
7 Water Plug
8 Anti-Ventilation Plate
9 Anode / Trim Tab
10 Propeller
11 Starter Handle
12 Shift Lever
13 Throttle Grip
14 Clamp Screw
15 Clamp Bracket
16 Thrust Rod
17 Oil Plug (Upper)
18 Water Inlet
19 Oil Plug (Lower)
20 Choke Knob
21 Stop Switch
22 Main Switch
23 Fuel Connector
24 Battery Cord
25 Spark Plug
26 Fuel Filter

PARTS NAME16
31
2
3
4
5
6
7
8
12
11
10
9
ENOF02103-2
ENOM00822-0
Remote control box & Fuel tank
1 Control Lever
2 Neutral lock arm
3 Free throttle lever
4 Main switch
5 Stop switch
6 Stop switch lock
7 Stop switch lanyard
8 Air vent screw
9 Fuel tank cap
10 Fuel connector (Engine side)
11 Primer bulb
12 Fuel connector (Fuel tank
side)

17
4
LABEL LOCATIONS
ENOM00019-A
Warning label locations
1, 2
3, 4
7
6
5
ENOF02206-3

LABEL LOCATIONS18
4
1, 3. Read owner's manual.
2. Engine stop switch (See page 37).
4. HOT SURFACE
Can cause burns.
Do not touch when operating or
immediately after the engine has
stopped.
ELECTRICAL SHOCK HAZARD
High voltage can cause severe electri-
cal shock.
Do not touch electrical components
such as ignition coil or spark plug cord
when starting or while the engine is in
operation.
HAZARD CAUSED BY ROTATING PARTS
Rotating parts can cause severe
injury.
Keep hands, feet, hair, and clothing
away from all rotating parts to prevent
injury.
For RC model
5. Be sure to fasten one end of the stop
switch lanyard to your body during
operation.
6. Warning regarding gasoline (See
page 24).
7. Warning regarding gasoline (See
page 24).
3F0X72185-0
ENOF00131-B
314X72185-0
ENOF00008-1
ENOF00005-S
ENOF00005-L

LABEL LOCATIONS 19
4
ENOM01001-0
1. Model code (Model name)
2. Serial No.
3. Rated power
4. Dry mass weight
5. Manufacture name
6. Manufacture address
7. Authorised representative
8. Authorised representative address
ENON00937-0
Note
For CE marked model
The Outboard engine is intended to install on non-recreational craft within the European Union
because it has not been confirmed compliance with requirement of Directive 2013/53/EU.
Serial number label locations
Description of serial number year code
Last two digits of alphabet represent production year as below.
Year Code BB BC BD BE BF
Year of
manufacture 2022 2023 2024 2025 2026
1521
CAN ICES-2 / NMB-2
ENOF02207-3
2)
3)
4)
5)
6)
1)
7)
8)

20
5
INSTALLATION
ENOM00024-B
ENOW00006-1
Most boats are rated and certified for their
maximum allowable horsepower, as shown
on the boat’s certification plate. Do not
equip your boat with an outboard motor that
exceeds this limit. If in doubt, contact your
dealer.
Do not operate the outboard motor until it
has been securely mounted on the boat in
accordance with the instructions below.
ENOW00009-2B
zMounting the outboard motor without
following this manual can lead to unsafe
conditions such as poor maneuverability,
lack of control or fire.
zLoose clamp screws and/or mounting
hardware can lead to the release or dis-
placement of the outboard motor, possi-
bly resulting in loss of control and/or
serious personal injury. Check the fasten-
ers for tightness before operating your
outboard.
zBe sure to use outboard mounting hard-
ware that meet in terms of size, material,
quality and strength.
Keep the outboard motor in a vertical
position when mounting.
ENOM00025-B
Position ... Above keel line
Place the outboard motor in the center
of the boat's transom.
1. Center of boat
2. Boat transom
1. Mounting the outboard
motor on boat
WARNING
WARNING
ENOF02208-0
2
1
ENOF01141-0