TOHATSU M 6B User manual

MANUAL
OWNER’S
OB No.003-11029-D
M 6B
8B
9.8B

Copyright © 2011 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.
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.
!

YOUR TOHATSU OUTBOARD MOTOR
OWNER REGISTRATION AND IDENTIFICATION
Upon purchasing this product, be sure that the WARRANTY CARD is correctly and
completely 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.
PRE-DELIVERY CHECK
Be sure that the product has been checked by an authorized TOHATSU dealer before
you take delivery.
Limited Warranty
Please refer to the TOHATSU outboard motor Limited warranty provided to you with
this product, the terms and conditions of which, as amended from time to time, are
incorporated by reference into the manual.

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 in the
event of theft or to quickly identifying the outboard motor type.
Serial Number :
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.
We hope you will enjoy your outboard motor and wish you good luck in your boating
adventures.
TOHATSU CORPORATION

GENERAL SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2 NAMES OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1. Mounting the outboard motor on boat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2. Installing the remote control devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3. Installing the battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 PRE-OPERATING PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1. Recommended gasoline types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2. Recommended engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3. Break-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5 ENGINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1. Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2. Warming up the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3. Forward and reverse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4. Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5. Trim angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6. Tilt up, tilt down and shallow water operation . . . . . . . . . . . . . . . . . . . . . . . . . 35
6 REMOVING AND CARRYING THE OUTBOARD MOTOR . . . . . . . . . . . . . . . . 38
1. Removing the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2. Carrying the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
3. Storing the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7 TRAILERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
1. Steering friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2. Remote control lever load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3. Throttle grip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4. Trim tab adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9 INSPECTION AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
1. Daily inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
2. Periodic inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3. Off-season storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4. Pre-season check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5. Motor submerged in water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6. Cold weather precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7. Checking after striking underwater object . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
10 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
11 TOOL KIT AND SPARE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12 OPTIONAL ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
13 PROPELLER TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
CONTENTS

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

8
NOTICE : DANGER/WARNING/CAUTION/Note
Before installing, operating or otherwise handling your outboard motor, be sure
to thoroughly read and understand this Owner's Manual and carefully follow all of
the instructions. 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.
EMERGENCY STOP SWITCH
The Emergency Stop Switch will stall the outboard motor when the stop switch tether
is pulled off. This stop switch tether can be attached to the operator of the outboard
motor to minimize or prevent injuries from the propeller in case the operator falls
overboard.
We highly recommend use of the Emergency Stop Switch tether.
Failure to observe will result in severe personal injury or death, and possibly property damage.
!
Note
This instruction provides special information to facilitate the use or maintenance of the
outboard motor or to clarify important points.
Failure to observe could result in personal injury or property damage.
!
!
Failure to observe could result in severe personal injury or death, or property damage.
GENERAL SAFETY INFORMATION
!
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 inch.)
stop switch tether is coiled and can extended to a full 1,300 mm (51 inch.).

9
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.
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.
MAINTENANCE
As the owner of this outboard motor, you should be acquainted with correct
maintenance procedures. It is the operator's responsibility to perform all safety checks
and to ensure that all lubrication and maintenance 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.
MOUNTING
Outboard motor mounting must be performed by trained service person(s) using lift or
hoist with sufficient capacity.
!
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.

10
1
SPECIFICATIONS
MODEL 6B MF 8B MF 8B EF 8B EP 9.8B MF 9.8B EF 9.8B EP
Item
Overall Length mm (in) 793 (31.2) 505 (19.9) 793 (31.2) 505 (19.9)
Overall Width mm (in) 320 (12.6) 275 (10.8) 320 (12.6) 275 (10.8)
Overall
Height
S mm (in) 996 (39.2)
L mm (in) 1,123 (44.2)
UL mm (in)) 1,250 (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) 28.5 (63) 26 (57) 29 (64) 28.5 (63)
L kg (lb) 27 (60) 30 (66) 29.5 (65) 27 (60) 30 (66) 29.5 (65)
UL kg (lb) 28 (62) 31 (68) 30.5 (67) 28 (62) 31 (68) 30.5 (67)
Output kW (Hp) 4.4 (6) 5.9 (8) 7.2 (9.8)
Max. Operating Range rpm 4,500 – 5,500 5,000 – 6,000
Idle
Speed
Forward Gear rpm 750
Neutral Gear rpm 950
Number of Cylinder 2
Piston Displacement
mL (Cu in) 169 (10.3)
Bore x Stroke mm (in) 50 x 43 (1.97 x 1.69)
Exhaust System Through hub exhaust
Lubrication System Engine Oil Mixed Gasoline
Cooling System Forced water cooling
Starting System Manual Electric starter motor* Manual Electric starter motor*
Ignition System Flywheel Magneto C.D. Ignition
Spark Plug BP7HS-10 or BPR7HS-10
Trim Position 6
Fuel Mixing Ratio Unleaded Gasoline 50 : Genuine 2-stroke Engine Oil 1
Gear Oil Genuine Gear Oil or API GL5, SAE #80 to #90, approx. 320mL
Fuel Tank Capacity
L (US gal) 12 (3.17)
Gear Reduction Ratio 2.08 (13 : 27)
* : with manual
Remark :
Specifications subject to change without notice.
6B MF, 8B MF, 8B EF, 8B EP, 9.8B MF, 9.8B EF, 9.8B EP