TOHATSU MX 50D2 User manual

TOHATSU CORPORATION
Address : 5-4, 3-chome, Azusawa, Itabashi-ku,
TOKYO, 174-0051 JAPAN
Phone : TOKYO [phone]
FAX : TOKYO [phone]
E-mail : www.tohatsu.co.jp
003-11098-0 1108NB
Printed in Japan
MX 50D 2
MWX 50D 2
OB No.003-11098-0
MX 50D 2
MWX 50D 2
GB
OWNER’S MANUAL
F
MANUEL
DE L’UTILISATEUR
ES
MANUAL
DEL PROPIETARIO
GB
OWNER’S MANUAL
F
MANUEL DE L’UTILISATEUR
ES
MANUAL DEL PROPIETARIO
MWX50D2_cover.indd 1 2011/08/18 17:00:08

MX 50D 2
MWX 50D 2
OB No.003-11098-0
OWNER’S
MANUAL
MWX50D2_E_cover.fm Page 1 Thursday, August 18, 2011 5:31 PM

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.
MWX50D2_E.book Page 2 Thursday, August 18, 2011 5:29 PM

YOUR TOHATSU OUTBOARD MOTOR
OWNER REGISTRATION AND IDENTIFICATION
Upon purchasing thisproduct, be sure that the WARRANTY CARD iscorrectly and com-
pletely filled out and mailed to the addressee noted there on. ThisWARRANTY CARD
identifiesyou asthe legal owner of the product and servesasyour 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 hasbeen 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 termsand conditionsof which, asamended from time to time, are incorpo-
rated by reference into the manual.
MWX50D2_E.book Page 3 Thursday, August 18, 2011 5:29 PM

Serial Number
In the space below, please record the outboard motor'sserial number (indicated both on
the bottom cowl and on the cylinder block). The serial number will be needed in ordering
spare partsand 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 yearsto come.
Thismanual should be read in itsentirety and the inspection and maintenance procedures
described later in thismanual should be followed carefully. Should a problem arise with the
outboard motor, please follow the troubleshooting procedureslisted 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
MWX50D2_E.book Page 4 Thursday, August 18, 2011 5:29 PM

GENERAL SAFETY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1. SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2. NAMESOF PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
1. Mounting the outboard motor on boat . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2. Propeller Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4. PRE-OPERATINGPREPARATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1. Recommended gasoline types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
2. Recommended engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Break-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5. ENGINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1. Starting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2. Warming up the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
3. Forward and reverse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4. Shallow water running . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5. Stopping the engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6. Trim angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
7. Mooring with the engine tilted up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
6. REMOVINGAND CARRYINGTHE OUTBOARD MOTOR. . . . . . . . . . . . . . 32
1. Removing the outboard motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
2. Carrying the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
3. Storing the outboard motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
7. TRAILERING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8. ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
1. Trim tab adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
2. Steering load adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3. Throttle grip turning load adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9. INSPECTION AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1. Daily inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
2. Periodic inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
3. Off-season storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
4. Pre-season check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
5. Checking after striking underwater object. . . . . . . . . . . . . . . . . . . . . . . . . 51
6. If the engine becomes submerged in water. . . . . . . . . . . . . . . . . . . . . . . . 51
7. Precautions in cold weather. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10. TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
11. TOOL KIT AND SPARE PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
12. OPTIONAL ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
13. PROPELLER TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
14. WIRINGDIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
CONTENTS
MWX50D2_E.book Page 5 Thursday, August 18, 2011 5:29 PM

7
GENERAL SAFETY INFORMATION
1. SPECIFICATIONS
2. NAMESOF PARTS
3. INSTALLATION
4. PRE-OPERATINGPREPARATIONS
5. ENGINE OPERATION
6. REMOVINGAND CARRYINGTHE OUTBOARD MOTOR
7. TRAILERING
8. ADJUSTMENT
9. INSPECTION AND MAINTENANCE
10. TROUBLESHOOTING
11. TOOL KIT AND SPARE PARTS
12. OPTIONAL ACCESSORIES
13. PROPELLER TABLE
14. WIRINGDIAGRAM
INDEX
1
14
2
3
4
5
6
7
8
9
10
11
12
13
MWX50D2_E.book Page 7 Thursday, August 18, 2011 5:29 PM

8
NOTICE : DANGER/WARNING/CAUTION/Note
Before installing, operating or otherwise handling your outboard motor, be sure to thor-
oughly read and understand thisOwner'sManual and carefully follow all of the instruc-
tions. Of particular importance isinformation preceded by the words"DANGER,"
"WARNING," "CAUTION," and "Note." Alwayspay special attention to such information to
ensure safe operation of the outboard motor at all times.
Failure to observe will result in severe personal injury or death, and possibly property dam-
age.
Failure to observe could result in severe personal injury or death, or property damage.
Failure to observe could result in personal injury or property damage.
Note
Thisinstruction providesspecial information to facilitate the use or maintenance of the outboard
motor or to clarify important points.
EMERGENCY STOP SWITCH
The Emergency Stop Switch will stall the outboard motor when the stop switch tether is
pulled off. Thisstop switch tether can be attached to the operator of the outboard motor
to minimize or prevent injuriesfrom the propeller in case the operator fallsoverboard.
We highly recommend use of the Emergency Stop Switch tether.
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.).
DANGER
WARNING
CAUTION
WARNING
GENERAL SAFETY INFORMATION
MWX50D2_E.book Page 8 Thursday, August 18, 2011 5:29 PM

9
SAFE OPERATION OF BOAT
Asthe 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 thismanual carefully.
It isvery 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 isin the immediate vicinity of people in the water, the outboard motor
should be shifted to neutral and shut off.
SERIOUSINJURY ISLIKELY IF A PERSON IN THE WATER MAKESCONTACT WITH A MOV-
INGBOAT, GEAR HOUSING, PROPELLER, OR ANY SOLID DEVICE RIGIDLY ATTACHED TO
A BOAT OR GEAR HOUSING.
SERVICING, REPLACEMENT PARTS& LUBRICANTS
We recommend that only an authorized service shop perform service or maintenance on
thisoutboard motor. Be sure to use genuine parts, genuine lubricants, or recommended
lubricants.
MAINTENANCE
Asthe owner of thisoutboard motor, you should be acquainted with correct maintenance
procedures. It isthe operator'sresponsibility to perform all safety checksand to ensure
that all lubrication and maintenance instructionsare complied with for safe operation.
Please comply with all instructionsconcerning lubrication and maintenance. You should
take the engine to an authorized dealer or service shop for periodic inspection at the pre-
scribed intervals.
Correct periodic maintenance and proper care of thisoutboard motor will reduce the
chance of problemsand limit overall operating expenses.
MOUNTING
Outboard motor mounting must be performed by trained service person(s) using lift or
hoist with sufficient capacity.
WARNING
MWX50D2_E.book Page 9 Thursday, August 18, 2011 5:29 PM

SPECIFICATIONS10
1
* Genuine Gear Oil or API GL5, SAE #80 to #90
Remark: Thisspecificationsmight change without a previousnotice.
X50D2MF, WX50D2MF
Item MODEL X50D2MF WX50D2MF
Overall Length mm (in) 1,143 (45.0) 1,145 (45.1)
Overall Width mm (in) 384 (15.1) 384 (15.1)
Overall Height
S mm (in) 1,225 (48.2) 
L mm (in) 1,352 (53.2) 1,413 (55.6)
LL mm (in) 1,427 (56.1) 
UL mm (in) 1,479 (58.2) 
Tran som Height
S mm (in) 403 (15.9) 
L mm (in) 530 (20.9) 550 (21.7)
LL mm (in) 570 (22.5) 
UL mm (in) 657 (25.9) 
Weight
S kg (lb) 72 (159) 
L kg (lb) 73.5 (162) 79 (174)
LL kg (lb) 74 (163) 
UL kg (lb) 75 (165) 
Output kW (Hp) 36.8 (50)
Max. Operating Range rpm 5,150-5,850
Number of Cylinders3
Piston Displacement mL (Cu in) 697 (42.53)
Bore x Stroke mm (in) 68 x 64 (2.68 x 2.52)
Exhaust System Through hub exhaust
Engine Lubrication Premixed Fuel
Fuel mixing Ratio 50 : 1
Cooling System Forced water cooling
Starting System Manual
Ignition System Flywheel Magneto C.D. Ignition
Spark PlugsNGK B8HS-10
Trim P osition 6
Engine Oil Genuine Motor Oil or recommended one (TCW-III)
Gear Oil* approx. 500mL approx. 700mL
Fuel Tank Capacity L (US gal) 25 (6.6)
Engine Oil Capacity L (US gal) 
Gear Reduction Ratio 1.85 (13 : 24) 1.92 (12 : 23)
Fuel Unleaded regular gasoline pump posted 87 Octane (research octane
rating of 91)
SPECIFICATIONS
MWX50D2_E.book Page 10 Thursday, August 18, 2011 5:29 PM

NAMESOF PARTS11
2
1Tilt Handle
2Top C o w l
3Hook Lever
4Water Check Port
5Reverse Lock Lever
6Water Plug
7Anti-ventilation Plate
8Trim Tab
9Propeller
10 Oil Plug (lower)
11 Water Strainer
12 Oil Plug (upper)
13 Clamp Bracket
14 Thrust Rod
15 Clamp Screw
16 Throttle Grip
17 Adjust Nut
18 Shift Lever
19 Starter Handle
20 Stop Switch
21 Choke Knob
22 Anode
X50D2MF, WX50D2MF
1
2
3
4
5
6
7
8
9
18
17
12
11
10
19 20
21
5
15
14
13
22
16
NAMESOF PARTS
MWX50D2_E.book Page 11 Thursday, August 18, 2011 5:29 PM

INSTALLATION12
3
Most boats are rated and certified in terms
of 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.
Note
Consult your authorized dealer to receive
the proper instructionsor ask your dealer to
mount the motor asnecessary.
Installation
Single-engine Installation
Position the outboard engine at the exact
center of the stern, and mount it using a
cushioning pad or plate.
Twin-engine Installation
When installing two outboard engines, be
sure to keep an interval of approximately
470 - 660 mm (18.5 - 26 in) between the
two.
Before beginning the running test, check
that the boat with maximum capacity
loading floats on the water in a proper
attitude. Check the position of water
surface on the driveshaft housing. If the
water surface is near the bottom cowl-
ing, in high waves, water may enter the
engine cylinders.
Incorrect outboard motor mounting
height or existence of underwater
object(s), such as hull bottom design,
bottom surface conditions or underwa-
ter accessories, can cause water spray
possibly reaching the engine through an
opening of the bottom cowling during
cruising. Exposing engine to such condi-
tions for extended periods can lead to
severe engine damage.
1. Mounting the outboard motor on
boat
WARNING
AA
470 - 660 mm
(18.5 - 26.1 in)
CAUTION
INSTALLATION
MWX50D2_E.book Page 12 Thursday, August 18, 2011 5:29 PM

INSTALLATION 13
3
Transom Height
Install the engine with the Anti-ventilation
Plate at a level 10~30mm (0.4~1.2in.)
below the bottom of the boat.
Transom Matching
Be sure that anti ventilation plate of the
outboard isbelow the water surface when
running with wide open throttle.
In case the above condition cannot be met
due to the shape of your boat, please con-
sult your authorized dealer.
Overheating may occur if the Anti-ventila-
tion Plate is at a level higher than the bot-
tom of the boat, as a result of a lack of
cooling water.
If the height difference exceeds10~30mm
(0.4~1.2 in) engine power performance is
likely to be reduced asa result of
increased water resistance to the gear
case assembly.
Attaching the Clamp Bracket
After positioning the Clamp Bracket, fix it
with clamp screw then drill four holesin
the transom board, matching the holesin
the Clamp Bracket. Secure the engine with
the supplied bolts(M12 x 105mm) and
nuts. Be sure to use the washers. Use the
larger diameter washersinside of the tran-
som board and use the small diameter
washersoutside of the clamp bracket.
The mounting holesmay be drilled before-
hand by referring to the dimensional draw-
ing.
Mounting the outboard motor without
following this manual can lead to unsafe
conditions such as poor maneuverabil-
ity, going out of control or fire disaster.
Loose clamp screws and/or mounting
bolts can lead to the release or displace-
ment of the outboard motor, possibly
resulting in lost of control and/or serious
personal injury. Be sure that fasteners
are tightened to the specified torque (30
Nm (3.0kgf) 13ft·lb). Check the fasteners
for tightness from time to time.
Be sure to use outboard mounting fas-
teners included in the outboard motor
package or their equivalents in terms of
size, material, quality and strength.
Tighten fasteners to the specified torque
(30 Nm (3.0kgf) 13ft·lb). Test cruise to
check if fasteners are tightened
securely.
Outboard motor mounting must be per-
formed by trained service person(s)
using lift or hoist with sufficient capacity.
Anti-ventilation Plate
10 ~ 30mm (0.4~1.2 in.)
CAUTION
WARNING
MWX50D2_E.book Page 13 Thursday, August 18, 2011 5:29 PM

INSTALLATION14
3
Clamp Bracket
Dimensional Drawing
Manual tilting type
Mounting bolts should be installed with the
bolt head at inside surface of the transom.
Mounting bolts installed with the threaded
end at the inside surface of the transom
can cause personal injury.
A propeller must be selected so that the
engine rpm measured at wide open throt-
tle while cruising iswithin the max. operat-
ing range; 5,150 to 5,850 rpm
For genuine propellers, refer to PROPEL-
LER TABLE (p. 57).
Washer
(large diameter)
Bolt
(12mm x length 105mm)
Washer
(small diameter)
Nut
ø13
ø13
234(9.21”)
39(1.54”)
222(8.74”)
248(9.76”)
26 ( 1.02” )
204(8.03”)
25(0.98”)
25(0.98”)
64(2.52”)
89(3.50”)
117(4.61”)
102(4.02”)102(4.02”)
117(4.61”)
Top o f t r a nsom
CAUTION
2. Propeller Selection
MWX50D2_E.book Page 14 Thursday, August 18, 2011 5:29 PM

PRE-OPERATINGPREPARATIONS15
4
Consult an authorized dealer for details on
handling of gasoline, if necessary.
Gasoline and its vapors are very flammable
and can be explosive.
When carrying a fuel tank containing gaso-
line:
Close the air vent screw of fuel tank cap,
or gasoline vapor will be emitted
through the air vent screw, creating a
fire hazard.
Do not smoke.
When or before refueling :
Stop the engine, and do not start the
engine during refueling.
Do not smoke.
Be careful not to overfill fuel tank. Wipe
up any spilled gasoline immediately.
When or before cleaning the gasoline tank :
Dismount fuel tank from the boat.
Place the fuel tank away from every
source of ignition, such as sparks or
open flames.
Do the work outdoors or in well venti-
lated area.
Wipe up any spilled gasoline immedi-
ately.
After cleaning gasoline tank :
Wipe up any spilled gasoline immedi-
ately.
If the fuel tank is disassembled for
cleaning, reassemble carefully. Imper-
fect assembly may cause a fuel leak,
possibly leading to fire or explosion.
Dispose of aged or contaminated gaso-
line in accordance with local regulations.
Use of low-quality gasoline results in a
short engine life as well as starting difficul-
ties and other engine problems.
We recommend use for Fuel stabilizer.
Use of unleaded gasoline
Use a major brand of automotive unleaded
gasoline with a minimum posted octane
rating of 91RON. Automotive gasoline that
contain fuel injector cleaner are preferred
for added internal engine cleanliness.
Leaded gasoline isacceptable in areas
where unleaded gasoline isnot available.
DANGER
1. Recommended gasoline types
CAUTION
PRE-OPERATINGPREPARATIONS
MWX50D2_E.book Page 15 Thursday, August 18, 2011 5:29 PM

PRE-OPERATINGPREPARATIONS16
4
Use of alcohol free gasoline
Use of gasoline containing alcohol can
cause engine starting and/or operating dif-
ficulties, wear of and damages to engine
parts, and deterioration of chemical parts,
which may lead to shortening of your out-
board motor’s life.
Note
The adverse effect caused by the alcohol
content ismore severe with methanol than
with ethanol.
TOHATSU recommend the use of gasoline
if itsethanol content isless than 10% or
methanol content isless than 5%, only in
case alcohol free gasoline isnot available.
The alcohol component of the gasoline
absorbsmoisture from the air, which may
disturb regular fuel flow in the fuel system,
and also accelerate rusting of engine
parts.
Mixing of the moisture in the engine oil can
also deteriorate the propertiesof the lubri-
cant.
If the use of gasoline containing alcohol is
inevitable, or presence of alcohol issus-
pected in the gasoline, it isstrongly recom-
mended to add a filter that haswater
separating capability, and check the fuel
system for leaksand mechanical partsfor
corrosion and abnormal wear more fre-
quently.
And, in case any of such abnormality is
found, discontinue the use of such gaso-
line and contact our dealer immediately.
Damagesresulting from the use of gaso-
linesthat contain alcohol are not covered
under the limited warranty.
Fuel tank capacity : 25 liters(6.6 U.S. gal)
Fuel Tank : When using a fixed fuel tank in
place of genuine fuel tank, it isrecom-
mended to select a one with a structure
facilitating interior cleaning.
Do not fill the fuel tank over capacity. The
rise of gasoline temperature may cause
gasoline to expand which, if overfilled, may
leak through air vent screw when it is open.
Leaking gasoline is a dangerous fire haz-
ard.
CAUTION
WARNING
MWX50D2_E.book Page 16 Thursday, August 18, 2011 5:29 PM

PRE-OPERATINGPREPARATIONS17
4
Use a genuine engine oil or recommended
one (TCW3). Refer to your Distributor.
Will not recommend use of other two
stroke engine oil.
Do not mix different brands of oil.
Mixing different brands of oil, or different
types of oil even if the brand is the same,
may cause gelling, resulting in possible fil-
ter screen blockage. This could result in
serious engine damage because of
impaired lubrication performance.
Note
Use of engine oilsthat do not meet these
requirementswill result in reduced engine
life, and other engine problems.
Add engine oil into fuel oil tank. The mixing
ratio with gasoline is1 : 50 (one part oil
and 50 partsgasoline). Mix well by hand.
The mixing ratio during break-in running is
1 : 25.
Mixing Ratio
2. Recommended engine oil
CAUTION
Engine Oil : Gasoline
During break-in 1 : 25
After break-in 1 : 50
10L
(0.2: 10)
(0.4: 10)
(0.5:25)
(1:25)
2L 25L 30L
0.1L
0
0.2L
0.3L
0.4L
0.5L
0.6L
0.7L
0.8L
0.9L
1.0L
1.1L
1.2L
1:25
1:50
Fuel by Oil Mixing (1:25, 1:50)
Gasoline
Oil
MWX50D2_E.book Page 17 Thursday, August 18, 2011 5:29 PM

PRE-OPERATINGPREPARATIONS18
4
Engine oil – gasoline mixing
procedure
For quantitiesof engine oil and gasoline to
be pre-mixed, refer to table in Recom-
mended engine oil (p. 17).
Do not use other than two stroke engine
oil with specified grade, or the engine
may be damaged.
Do not use fuel prepared in other than
specified mixing ratio.
- Lack of engine oil can cause severe
engine trouble such as piston seizure.
- Excess of engine oil can shorten spark
plug life, and/or cause increase of nox-
ious exhaust.
When portable fuel tank is used for
operation of outboard motor(s):
1 Pour engine oil into fuel tank, and then,
gasoline.
2 Put cap on the tank, and close tightly.
3 Close air vent plug tightly.
Loose cap or air vent plug can cause leak
of fuel during shaking the tank.
4 Shake the tank to mix engine oil and
gasoline well and even.
When fuel tank built in the boat is
used for operation of outboard
motor(s):
1 Prepare separate fuel container for pre-
mixing.
2 Pour engine oil into fuel container, and
then, gasoline.
3 Put cap on the container, and close
tightly.
4 Shake the container to mix engine oil
and gasoline well and even.
5 Pour the mixture into fuel tank.
Notes
It isrecommended to pre-mix by using
separate fuel container. Attempting to
pre-mix in the fuel tank built-in the boat
can make the mixture uneven.
If built-in fuel tank isused for mixing,
pour engine oil into the tank little by little
while putting gasoline into the tank.
CAUTION
WARNING
MWX50D2_E.book Page 18 Thursday, August 18, 2011 5:29 PM

PRE-OPERATINGPREPARATIONS19
4
Your new outboard motor and lower unit
require break-in for the moving compo-
nentsaccording to the conditions
described in the following time table. Operating the outboard motor without
break-in can shorten service life of the
product.
If any abnormality is experienced during
the break-in:
Discontinue the operation immediately.
Have the dealer check the product and
take proper action(s) if necessary.
Note
Proper break-in allowsoutboard motor to
deliver it full performance for longer service
life.
Fuel mix ratio for break-in
Gasoline 25: Genuine Engine Oil 1
25:1 when using genuine engine oil or
the recommended one (TCW3).
Do not operate the outboard motor in
closed area or area with no forced ventila-
tion.
Exhaust gas emitted by this outboard
motor contains carbon monoxide that will
cause death if inhaled continuously. Inhal-
ing the gas initially causes symptoms such
as feeling of sickness, drowsiness and
headache.
During operation of the outboard motor :
Keep peripheral area well ventilated.
Always attempt to stay on the windward
side of emission.
3. Break-in
CAUTION
1-10min 10min-2hrs 2-3hrs 3-10hrs After 10hrs
Throttle
Position Idle Less than 1/2
throttle
Less than 3/4
throttle 3/4 throttle Full throttle available
Speed Approx.
3,000 rpm max
Full throttle run
allowed for 1 min
every 10 min
Approx.
4,000 rpm.
Full throttle run
allowed for 2 min
every 10 min
DANGER
MWX50D2_E.book Page 19 Thursday, August 18, 2011 5:29 PM

ENGINE OPERATION20
5
In case engine starts in gear, do not start
cruising. Stop engine immediately and con-
sult an authorized dealer.
Note
The engine will not start unless the switch
lock hasbeen properly connected into the
emergency stop switch.
Do not operate the engine with gear case
out of water.
Severe personal injury, or engine damage
will result.
Never fill up portable fuel tanks on board to
avoid fire or explosion resulting from
spilled gasoline. If gasoline is ever spilled
on board, wipe it up thoroughly. Fuel tanks
must always be filled up on land.
Preparations
1 Loosen the air vent screw on the tank
cap.
2 Connect the fuel connector to the
engine.
1. Starting
WARNING
WARNING
CAUTION
ENGINE OPERATION
MWX50D2_E.book Page 20 Thursday, August 18, 2011 5:29 PM