TOHATSU MFS 75A User manual

OWNER’S
MANUAL
AAAA
Original instructions
MFS A
MFS A
MFS A
OB No.--BX
MFS A

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 © 2020 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 proce-
dures 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 ser-
vice shop or dealer.
All information in this manual is based on the latest product information available at
the time of approval for printing.
Tohatsu Corporation reserves the right to make changes at any time without notice
and without incurring any obligation.
Please always keep this manual together with the outboard motor as a reference to
everyone 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
contains 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).

4
ENOM00002-0
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.
ENOM00003-0
PRE-DELIVERY CHECK
Be sure that the product has been checked by an authorized TOHATSU dealer before
you take delivery.

5
ENOM00005-A
Serial Number
In the space below, please record the outboard motor's serial number (indicated
both on the swivel bracket and on the cylinder block). The serial number will be
needed when ordering parts, and when making technical or warranty inquiries.
Serial Number:
Serial Number: Date of purchase:
ENOF02400-0
ENOF02401-0

6
ENOM00007-0
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 “DAN-
GER,” “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 out-
board motor or to clarify important points.
DANGER
WARNING
CAUTION

1. GENERAL SAFETY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. PARTS NAME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4. LABEL LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1. Mounting the outboard motor on boat . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2. Battery installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3. Propeller installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4. TOCS (Tohatsu Onboard Communication System) installation. . . . . . . . . 25
6. PRE-OPERATING PREPARATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1. Fuel handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2. Fuel filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
3. Engine oil filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4. Break-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5. Warning system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7. ENGINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Before starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
1. Fuel feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2. Starting the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3. Warming up the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4. Forward, reverse, and acceleration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5. Stopping the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6. Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7. Trim angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
8. Tilt up and down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
9. Shallow water operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8. REMOVING AND CARRYING THE OUTBOARD MOTOR. . . . . . . . . . . . . . . . . . . 55
1. Removing the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2. Carrying the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3. Trailering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
9. ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
1. Steering friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2. Throttle grip friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
3. Remote control lever friction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4. Trim tab adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
10. INSPECTION AND MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
1. Daily Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2. Periodic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3. Off-season storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
4. Pre-season check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
5. Submerged outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
6. Cold weather precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
7. Striking underwater object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
CONTENTS

8. Operation with multiple outboard motors . . . . . . . . . . . . . . . . . . . . . . . . 83
11. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
12. ACCESSORIES KIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
13. PROPELLER TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

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
1
3
4
5
6
7
8
9
10
11
12
13
1
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 MOVING
BOAT, GEAR HOUSING, PROPELLER, OR ANY SOLID DEVICE RIGIDLY ATTACHED TO A BOAT OR
GEAR HOUSING.
ENOM00247-0
STOP SWITCH LANYARD
The engine can be stopped with 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 when the
operator falls accidentally overboard or leaves from operator’s position. This function
can be prevent losing control of and minimize or prevent risk of collision with 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 the boat, you are responsible to wear a PFD
(Personal Flotation 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 recom-
mended lubricants.
ENOM00011-A
MAINTENANCE
As the owner of this outboard motor, you should be acquainted with correct mainte-
nance procedures following maintenance section of this manual (See page 60). 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.
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
(z)These models can be purchased with remote rigging kit or multi-function tiller han-
dle.
ENOM00811-A
MODEL NAME EXAMPLE
F 115A ETL
Model F75A F90A F100A F115A
Type ET ET ET ET
Transom heights
Lzzzz
UL z z z
Multi-function tiller handle (z) (z) (z) (z)
Remote Control (z) (z) (z) (z)
Power Trim & Tilt zzzz
F115 A E T L
Model descrip-
tion Horse power Product genera- tion
Starter
system Tilt system Shaft length
F= Four stroke -A and up E= Electrical start T= Power trim&tilt L= Long 20 in
UL= Ultra long 25 in

SPECIFICATIONS 13
2
ENOM00013-0
ET
Item MODEL
F75/90/100/115A
ET
(with RC)
ET (with multi-function
tiller handle)
Overall Length mm (in) 826 (32.50) 1541 (60.7)
Overall Width mm (in) 540 (21.3)
Overall Height L•UL mm (in) 1652 (65.1) 1779 (70.1)
Transom Height L•UL mm (in) 517 (20.4) 644 (25.4)
Weight* L kg (lb) 178.0 (392) 182.5 (402)
UL kg (lb) 182.5 (402) 187.0 (412)
Max. Output kW (ps) 75A:55.2 (75) 90A:66.2 (90) 100A:73.6 (100) 115A:84.6 (115)
Max. Operating Range min
-1
(rpm) 5000-6000
Idle Speed min
-1
(rpm) 700
Engine Type 4-Stroke fuel injection
Number of Cylinder 4
Bore × Stroke mm (in) 84 × 90 (3.31 × 3.54)
Piston Displacement cm
3
(Cu in) 1995 (121.6)
Exhaust System Through hub exhaust
Cooling System Water cooling (with thermostat)
Lubrication System Wet sump (Trochoid pump)
Starting System Electric starter motor
Ignition System Battery ignition
Spark Plug NGK LKR6E
Alternator 12V - 41A
Trim position 2
Trim angle Degree 8-24
Tilt up angle Degree 75
Steering angle Degree 70
Engine Oil
Grade API Standards SH, SJ, SL, SAE: 10W-30/40
mL(US/
Imp.qt.) 4200 (4.4/3.7) with oil filter replacement
Gear Oil
Grade Genuine Gear Oil or GL5, SAE#80-90
mL(US/
Imp.oz.) 1000 (34/35)
Fuel Unleaded petrol 87 Octane (Reseach octane rating of 91)
Gear shift Dog clutch ( F-N-R)
Gear Reduction Ratio 2.08 (25:12)
Battery (minimum reqirements) 70Ah/20HR, 512CCA
EmissionControlSystem SFI (Sequential Multiport Fuel Injection)

SPECIFICATIONS14
2
Remark: Specifications subject to change without notice.
*With propeller
Tohatsu outboard is power rated in accordance with ISO8665 (propeller shaft output).
Operator Sound Pressure (ICOMIA
39/94 Rev.1) dB (A) 90.4
Hand Vibration Level (ICOMIA 38/94
Rev.1) m/s23.6
Item MODEL
F75/90/100/115A
ET
(with RC)
ET (with multi-function
tiller handle)

15
3
PARTS NAME
ENOM00820-0
ET (with multi-function tiller handle)
1
2
3
4
5
6
7
27
29
8
16
15
14 13
12
11
10
9
30
28
31
32
33
34
35
36
18
25
24
23
19 26
37
17
22
21
20
29 29
ENOF02402-0
1 Air Guide
2 Top Cowl
3 Bottom Cowl
4 Cooling Water Check Port
5 Drive Shaft Housing
6 Anode
7 Trim Tab
8 Propeller
9 Oil Plug (Lower)
10 Cooling Water Inlet
11 Oil Plug (Upper)
12 Anti-ventilation Plate
13 Splash Plate
14 Anode
15 Thrust Rod
16 Clamp Bracket
17 Steering Friction Lever
18 Main Switch Key
19 Shift Lever
20 Tiller Handle
21 Throttle Grip
22 PTT Switch
23 Warning Lamp
24 Stop Switch
25 Stop Switch Lanyard
26 Oil Filler Cap
27 Spark Plug
28 Oil Level Gauge
29 Cowl Hook Lever
30 Idle Port
31 Manual Valve
32 Oil Filter
33 Fuel Filter
34 Flushing Connector Cap
35 PTT Switch
36 Oil Drain Bolt
37 Throttle Friction Screw

PARTS NAME16
3
3
1
2
4
5
6
7
818
21
20
19
11 9
10
12
16
13
14
15
17 13
14
15
16
ENOF02403-0
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 Control lever
10 Neutral lock arm
11 PTT switch
12 Neutral throttle button
13 Main switch
14 Stop switch
15 Stop switch lock
16 Stop switch lanyard
17 Fuel gauge
18 Air vent screw
19 Fuel tank cap
20 Primer bulb
21 Fuel connector (Fuel tank
side)

17
4
LABEL LOCATIONS
ENOM00019-A
Warning label locations
ENOF02404-0
1
4
2
9
10
8
7
11
3
5
6

LABEL LOCATIONS18
4
1. Warning regarding urge to read the
owner's manual.
2-1. Warning regarding emergency start-
ing.
2-2. Warning regarding high temperature.
2-3. Warning regarding rotating object.
2-4. Warning regarding high voltage
2-5. Caution regarding fuel filter. (See
page 61, 66, 67
For tiller handle model
3. Indicator regarding engine failure/
malfunction (See page 31).
For tiller handle model
4. Warning regarding stop switch (See
page 37 and page 47)
For RC model
5. Warning regarding stop switch lan-
yard.
For Top mount RC
6. Warning regarding urge to read the
owner's manual.
7. Warning regarding gasoline.
8. Warning regarding gasoline (See
page 26).
3F0-72185-000
123
4
5
3UG-72181-000
ENOF00005-C
ENOF00005-P
ENOF00005-D
ENOF00120-0
ENOF00005-E
ENOF00005-L

LABEL LOCATIONS 19
4
9. Warning regarding gasoline (See
page 26).
10. Warning regarding gasoline (See
page 26).
11. Caution tag regarding for replenish
the engine oil. (See page 28).
ENOF00005-M
ENOF00005-F
3VJ-72044-000

LABEL LOCATIONS20
4
ENOM00019-B
1. Model code (Model name)
2. Rated power
3. Dry mass weight (Without propeller, with battery
cable)
4. Serial No.
5. Manufacturer name
6. Manufacturer address
CE label locations
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0026
CAN ICES2/NMB2
1)
2)
3)
4)
5)
6)
ENOF02405-0
Description of serial number year code
Last two digits of alphabet represent production year as below.
Year Code BX BA BB BC BD
Year of
manufacture 2020 2021 2022 2023 2024