OWNER’S MANUAL
Read this manual carefully before operating this machine.
MZ175
MZ200
MZ250
MZ300
MZ360
PRINTED IN CHINA
2013.11×1 !
(E)
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Read this manual carefully before operating this machine. This manual
should stay with this machine if it is sold.
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INTRODUCTION
Congratulations on your purchase of your new Yamaha.
This manual will provide you with a good basic understanding of the operation and
maintenance of this machine.
If you have any questions regarding the operation or maintenance of your machine,
please consult a Yamaha dealer.
MZ175, MZ200, MZ250, MZ300, MZ360
OWNER’S MANUAL
© 2013 by Yamaha Motor Corporation, U.S.A.
1st Edition, November 2013
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in China
P/N LIT-19626-02-05
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IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following
notations.
This is the safety alert symbol. It is
used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
WARNING
A WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
NOTICE
A NOTICE indicates special precautions that must be taken to avoid damage to the machine or other property.
TIP
A TIP provides key information to make
procedures easier or clearer.
WARNING
PLEASE READ AND UNDERSTAND
THIS MANUAL COMPLETELY BEFORE
OPERATING THE MACHINE.
TIP
9 Yamaha continually seeks advancements in product design and quality.
Therefore, while this manual contains
the most current product information
available at the time of printing, there
may be minor discrepancies between
your machine and this manual. If
there is any question concerning this
manual, please consult a Yamaha
dealer.
9 This manual should be considered a
permanent part of this machine and
should remain with this machine
when resold.
* Product and specifications are subject to
change without notice.
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CONTENTS
SAFETY INFORMATION ....................... 1
Exhaust fumes are poisonous ............ 1
Fuel is highly flammable and
poisonous ............................................ 1
Engine and muffler may be hot ........... 2
Electric shock prevention .................... 3
LOCATION OF IMPORTANT
LABELS ................................................. 5
DESCRIPTION ..................................... 13
CONTROL FUNCTION ........................ 15
Engine switch .................................... 15
Oil warning light (Red) ...................... 15
Fuel tank cap (For models
equipped with a Yamaha fuel tank) ... 16
Fuel cock lever .................................. 16
Recoil starter handle ......................... 16
Choke lever ....................................... 17
Throttle lever ..................................... 17
PREPARATION .................................... 18
Fuel (For models equipped with a
Yamaha fuel tank) ............................. 18
Engine oil .......................................... 20
Connecting the battery (For models
equipped with electric starter) ........... 21
PRE-OPERATION CHECK .................. 22
Pre-operation check .......................... 22
OPERATION ........................................ 23
Starting the engine............................ 24
Stopping the engine .......................... 27
High altitude operation ..................... 29
PERIODIC MAINTENANCE ................ 30
Maintenance chart ............................ 30
Spark plug inspection ....................... 32
Carburetor adjustment ...................... 33
Engine oil replacement ..................... 33
Air filter .............................................. 35
Spark arrester ................................... 36
Fuel cock ........................................... 39
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Fuel tank filter (For models
equipped with a Yamaha fuel tank) ... 40
Fuse replacement
(For electric starting model) .............. 40
STORAGE ............................................ 42
Drain the fuel..................................... 42
Engine ............................................... 44
TROUBLESHOOTING ......................... 45
Engine won’t start ............................. 45
SPECIFICATIONS ................................ 51
Dimensions ....................................... 51
Engine ............................................... 52
CONSUMER INFORMATION .............. 55
Identification number records............ 55
Machine identification ....................... 55
EXHAUST EMISSION CONTROL
SYSTEM AND COMPONENTS ........... 56
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SAFETY INFORMATION
9 Do not allow children to operate the multi-purpose
engine.
9 Do not place any obstacles on the multi-purpose
engine.
Exhaust fumes are poisonous
9 Using a multi-purpose engine indoors CAN KILL
YOU IN MINUTES. Multi-purpose engine exhaust
contains carbon monoxide. This is a poison you
cannot see or smell.
9 NEVER use inside a home or garage, EVEN IF
doors and windows are open.
9 Only use OUTSIDE and far away from windows,
doors, and vents.
Fuel is highly flammable and poisonous
9 Always turn off the engine when refuelling.
9 Never refuel while smoking or in the vicinity of an
open flame.
9 Take care not to spill any fuel on the engine or
muffler when refueling.
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9 Do not leave the multi-purpose engine inside the
vehicle or in the trunk.
9 If you swallow any fuel, inhale fuel vapor, or allow
any to get in your eye(s), see your doctor immediately. If any fuel spills on your skin or clothing,
immediately wash with soap and water and
change your clothes.
9 When refueling, do not place the fuel tank cap
near the muffler.
9 Take care not to spill fuel.
9 When operating or transporting the machine, be
sure it is kept upright. If it tilts, fuel may leak from
the carburetor or fuel tank.
Engine and muffler may be hot
9 Place the machine in a place where pedestrians
or children are not likely to touch the machine.
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9 Avoid placing any flammable materials near the
exhaust outlet during operation.
9 In order to prevent overheating, be sure the equipment in which the multi-purpose engine is mounted allows adequate ventilation, and keep the
equipment at least 1m (3 ft) from objects or other
equipment.
9 Do not operate the engine with a dust cover or
other objects covering it.
9 When covering the multi-purpose engine, be sure
to do so only after the engine and muffler have
completely cooled down.
Electric shock prevention
9 Never operate the engine in rain or snow.
9 Never touch the machine with wet hands or electrical shock will occur.
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LOCATION OF IMPORTANT LABELS
Please read the following labels carefully before operating this machine.
TIP
Maintain or replace safety and instruction labels, as
necessary.
(MZ175)
3
1
2
2
4
1
This spark ignition system meets all requirements of the Canadian Interference
Causing Equipment Regulations.
Ce système d’allumage respecte toutes
les exigences sur le matériel brouilleur du
Canada.
7CC-H2377-50
2 (with fuel tank model)
(without fuel tank model)
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3
7CN-F4162-50
4
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(MZ200)
3
4
2
1
1 (with fuel tank model)
(without fuel tank model)
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2
4
This spark ignition system meets all requirements of the Canadian Interference
Causing Equipment Regulations.
Ce système d’allumage respecte toutes
les exigences sur le matériel brouilleur du
Canada.
7CC-H2377-50
3
7CN-F4162-50
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(MZ250, MZ300 (7VB))
3
2
1
4
1 (with fuel tank model)
(without fuel tank model)
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2
4
This spark ignition system meets all requirements of the Canadian Interference
Causing Equipment Regulations.
Ce système d’allumage respecte toutes
les exigences sur le matériel brouilleur du
Canada.
7CC-H2377-50
3
7CN-F4162-50
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(MZ300 (7CS), MZ360)
3
2
4
1
1
This spark ignition system meets all requirements of the Canadian Interference
Causing Equipment Regulations.
Ce système d’allumage respecte toutes
les exigences sur le matériel brouilleur du
Canada.
7CC-H2377-50
2 (with fuel tank model)
(without fuel tank model)
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3
4
7CN-F4162-50
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DESCRIPTION
(MZ175, MZ200, MZ360)
0
1
2
9
3
8
4
5
7
6
(MZ250, MZ300 (7VB))
0
1
2
9
3
4
8
5
7
6
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(MZ300 (7CS))
0
1
2
3
q
9
w
8
4
5
7
6
y
1 Fuel tank cap (On models
equipped with a Yamaha fuel
tank)
2 Fuel tank (On models
equipped with a Yamaha fuel
tank)
3 Throttle lever
4 Recoil starter handle
5 Fuel cock lever
6 Fuel cock cup
7 Air filter case cover
8 Choke lever
9 Spark plug
0 Muffler
q Oil warning light (Red)
w Engine switch
e Oil filler cap
r Oil drain bolt
t Carburetor
y Fuel tank filter (On models
equipped with a Yamaha fuel
tank)
q
t
w
e
r
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CONTROL FUNCTION
A
Engine switch
2
The engine switch controls the ignition system.
1 “ON”/“7” (ON)
1
B
1
2 “OFF”/“5” (STOP)
Ignition circuit is switched off.
The engine will not run.
3
2
Ignition circuit is switched on.
The engine can be started.
3 “6” (START)
763-119
Starting circuit is switched on.
The starter motor starts and the engine can be started.
After starting the engine, take your hand off the switch
immediately.
A Manual starting model
B Electric starting model
Oil warning light (Red)
When the oil level falls below the lower level, the oil
warning light comes on and then the engine stops
automatically. Unless you refill with oil, the engine will
not start again.
TIP
(Manual starting model)
If the engine stalls or does not start, turn the engine
switch to “ON” and then pull the recoil starter. If the oil
warning light flickers for a few seconds, the engine oil
is insufficient. Add oil and restart.
(Electric starting model)
If the engine stalls or does not start, turn the engine
switch to “6” (START). If the oil warning light comes
on, the engine oil is insufficient. Add oil and restart.
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Fuel tank cap (For models equipped with a
Yamaha fuel tank)
Remove the fuel tank cap by turning it counterclockwise. (On models equipped with a Yamaha fuel tank)
Fuel cock lever
2
The fuel cock supplies fuel from the fuel tank to the
carburetor.
The fuel cock has two positions.
2
1 ON
With the lever in this position, fuel flows to the carburetor. Normal using is done with the lever in this position.
1
2 OFF
With the lever in this position, fuel will not flow. Always
turn the lever to this position when the engine is not
running.
1
Recoil starter handle
Used to start the engine.
1 Recoil starter handle
NOTICE
9 Pull the recoil starter handle straight.
9 Return the recoil starter handle slowly.
9 Do not touch the recoil starter handle while
the multi-purpose engine is operating.
TIP
Pull the recoil starter handle after turning the engine
switch to “ON”.
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Choke lever
A
Starting a cold engine requires a richer air-fuel mixture, which is supplied by the choke lever.
1
1 Choke lever
ABC
Functions and specification differs depending on the models.
B
1
701-025c
C
1
701-033b
Throttle lever
A
Throttle lever controls the engine speed.
1 “
1
2
”
Lever position to idle the engine.
Decrease engine speed.
2 “
”
Increase engine speed.
B
AB
Functions and specification differs depending on the models.
1
2
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PREPARATION
Fuel (For models equipped with a Yamaha
fuel tank)
WARNING
9 Fuel is highly flammable and poisonous.
Check “SAFETY INFORMATION” (See page 1)
carefully before filling.
9 Do not fill the fuel above the red line, otherwise it may overflow when the fuel warms up
and expands.
9 Wipe up any spilled fuel immediately.
9 After refueling, make sure the fuel tank cap is
tightened securely.
NOTICE
Immediately wipe off spilled fuel with a clean, dry,
soft cloth, since fuel may deteriorate painted surfaces or plastic parts.
1 Red line
1
1. Stop the engine.
2. Place the engine on a level surface.
3. Remove the fuel tank cap.
4. Check the fuel level.
5. If low, fill the tank with fuel. Do not fill past the red
line as fuel may mix with the activated charcoal in
the fuel tank cap and overflow.
2
3
TIP
If filled beyond the red line, fuel may mix with the
active charcoal located within the fuel tank cap and
soil the surrounding areas.
2 Red line
3 Correct fuel level
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Recommended fuel:
Unleaded gasoline
Fuel tank capacity:
Total:
MZ175
4.0 L
MZ200
4.0 L
MZ250
5.5 L
MZ300
5.5 L
MZ360
6.1 L
(1.06
(1.06
(1.45
(1.45
(1.61
US
US
US
US
US
gal,
gal,
gal,
gal,
gal,
0.88
0.88
1.21
1.21
1.34
Imp
Imp
Imp
Imp
Imp
gal)
gal)
gal)
gal)
gal)
Your Yamaha engine has been designed to use regular unleaded gasoline with a pump octane number ((R
+ M)/2) of 86 or higher, or research octane number of
91 or higher.
NOTICE
Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts.
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Engine oil
NOTICE
The multi-purpose engine has been shipped without engine oil. Do not start the engine until you
have filled it with the sufficient engine oil.
1. Place the multi-purpose engine on a level surface.
2. Remove the oil filler cap.
1 Oil filler cap
1
3. Fill the specified amount of the recommended
engine oil.
700-006
4. Check the oil level of the oil filler hole.
2
2 Correct level
5. Install the oil filler cap.
700-103
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0˚C
25˚C
A YAMALUBE 4 (10W-40)
D SAE 10W
C SAE #20
32˚F
B SAE #30
80˚F
Recommended engine oil:
A YAMALUBE 4 (10W-40),
SAE 10W-30 or 10W-40
B SAE #30
C SAE #20
D SAE 10W
Recommended engine oil grade:
API Service SE type or higher
Engine oil quantity:
MZ175
0.6 L (0.63 US
MZ200
0.6 L (0.63 US
MZ250
1.0 L (1.06 US
MZ300 (7VB) 1.0 L (1.06 US
MZ300 (7CS) 1.1 L (1.16 US
MZ360
1.1 L (1.16 US
qt,
qt,
qt,
qt,
qt,
qt,
0.53
0.53
0.88
0.88
0.97
0.97
Imp
Imp
Imp
Imp
Imp
Imp
qt)
qt)
qt)
qt)
qt)
qt)
Connecting the battery
(For models equipped with electric starter)
1
2
764-004
Recommended battery capacity is 12 V/26 Ah or
more.
Use battery lead wires with cross section of at least
8 mm (0.31 in) square.
1 Connect the battery positive terminal to the starter switch.
2 Ground the battery negative terminal to the engine mounting bolt.
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PRE-OPERATION CHECK
WARNING
If any item in the Pre-operation check is not working properly, have it inspected and repaired before
operating the multi-purpose engine.
The condition of a multi-purpose engine is the owner’s
responsibility. Vital components can start to deteriorate
quickly and unexpectedly, even if the multi-purpose
engine is unused.
TIP
Pre-operation checks should be made each time the
multi-purpose engine is used.
Pre-operation check
Fuel (See page 18 for Yamaha fuel tank instructions)
9 Check fuel level in fuel tank.
9 Refuel if necessary.
Fuel line
9 Check fuel hose for cracks or damage.
9 Replace if necessary.
Engine oil (See page 20)
9 Check oil level in engine.
9 If necessary, add recommended oil to correct
level.
9 Check multi-purpose engine for oil leakage.
The point where abnormality was recognized by
use
9 Check operation.
9 If necessary, consult a Yamaha dealer.
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OPERATION
WARNING
Never operate the engine in a closed area or it
may cause unconsciousness and death within a
short time. Operate the engine in a well ventilated
area.
NOTICE
The multi-purpose engine has been shipped without engine oil. Do not start the engine until you
have filled it with the sufficient engine oil.
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Starting the engine
1. Turn the fuel cock lever to ON.
1 ON
1
2. Pull the choke lever fully out. A
Turn the choke lever to “1”. B C
A
2 Choke lever
ABC
Functions and specification differs depending on the models.
2
B
2
TIP
The choke is not required to start a warm engine.
When starting the warm engine, put the choke lever to
the original position.
701-025c
C
2
701-033
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3. Move the throttle lever slightly to right.
A
3 Throttle lever
3
AB
Functions and specification differs depending on the models.
B
3
4. Turn the engine switch to “ON”/“7” (ON).
A
4 “ON”/“7” (ON)
4
B
A Manual starting model
B Electric starting model
4
763-127h
5. (Manual starting model) Pull the recoil starter
slowly until it is engaged, then pull it briskly.
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5
6. (Electric starting model) Turn the engine switch to
“6” (START).
Take your hand off the switch immediately after
the engine starts.
5 “6” (START)
763-120a
NOTICE
If the engine fails to start, release the switch, wait
a few seconds, then try again. Each attempt
should be as short as possible to preserve the
battery. Do not crank the engine more than 5 seconds on any one attempt.
7. After the engine starts, warm up the engine
enough so that the engine does not stop when the
choke lever is returned to the original position.
A
6 Original position
6
ABC
Functions and specification differs depending on the models.
B
6
701-025c
C
6
701-033a
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8. Set the throttle lever in desired position.
A
7 “
8 “
7
8
”: Decrease engine speed
”: Increase engine speed
AB
Functions and specification differs depending on the models.
B
7
8
Stopping the engine
A
1. Move the throttle lever fully to the left.
1 Throttle lever
AB
Functions and specification differs depending on the models.
B
1
2. Turn the engine switch to “OFF”/“5” (STOP).
A
2
2 “OFF”/“5” (STOP)
A Manual starting model
B Electric starting model
B
2
763-120b
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3. Turn the fuel cock lever to OFF.
3 OFF
3
3
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High altitude operation
This engine may require a high altitude carburetor kit to ensure correct engine operation at altitudes above 4000 ft. (1219 meters). If you operate your engine at altitudes
above 4000 ft. (1219 meters) consistently, have your local Yamaha dealer perform the
necessary carburetor modification. This engine should be operated in its original configuration below 4000 ft. (1219 meters) as damage may occur if high altitude carburetor kit
is installed and operated below 4000 ft. (1219 meters).
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PERIODIC MAINTENANCE
Safety is an obligation of the owner. Periodic inspection, adjustment and lubrication will
keep your multi-purpose engine in the safest and most efficient condition possible. The
most important points of multi-purpose engine inspection, adjustment, and lubrication
are explained on the following pages.
WARNING
If you are not familiar with maintenance work, have a Yamaha dealer do it for you.
Maintenance chart
WARNING
Stop the engine before starting maintenance work.
NOTICE
Use only Yamaha specified genuine parts for replacement. Ask an authorized
Yamaha dealer for further information.
Item
Routine
Initial
Every
Preoperation 1 month 3 months 6 months 12 months
check
or 20 Hrs or 50 Hrs or 100 Hrs or 300 Hrs
• Check condition.
Spark plug
• Clean and replace if
necessary.
• Check fuel level and
leakage.
• Check fuel hose for
cracks or damage.
Fuel
Fuel hose
1
1
1
• Replace if necessary.
• Check oil level in
engine.
Engine oil
1
• Replace.
1
• Check condition.
Air filter
element
1
1 (*1)
• Clean.
• Check condition.
Spark arrester • Clean and replace if
necessary.
• Clean and replace if
Fuel tank filter
necessary.
• Clean and replace if
Fuel strainer
necessary.
1
1
1
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Item
Routine
Crankcase
breather hose
Cylinder head
Valve
clearance
Idle speed
Recoil starter
Fittings /
fasteners
Initial
Every
Preoperation 1 month 3 months 6 months 12 months
check
or 20 Hrs or 50 Hrs or 100 Hrs or 300 Hrs
• Check breather hose
for cracks or damage.
1
• Replace if necessary.
• Decarbonize cylinder
head.
• More frequently if
necessary.
• Check and adjust
when engine is cold.
• Check and adjust idle
speed.
• Check recoil starter for
damage.
• Check all fittings and
fasteners.
After every 500 Hrs. ()




• Correct if necessary.
The point where abnormality was
recognized by use.
1
*1·····The air filter element needs to be cleaned more frequently when using in unusually wet or
dusty areas.
·····Since these items require special tools, data and technical skills, have a Yamaha dealer perform the service.
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Spark plug inspection
A
The spark plug is an important engine component,
which should be checked periodically.
1. Remove the spark plug cap and the spark plug.
2. Check for discoloration and remove the carbon.
The porcelain insulator around the center electrode of spark plug should be a medium-to-light
tan color.
B
A MZ175, MZ200
B Except for MZ175, MZ200
3. Check the spark plug type and gap.
a Spark plug gap
Standard spark plug:
BPR4ES (NGK)
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
a
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specification.
4. Install the spark plug and then tighten it.
Spark plug tightening torque:
20 Nm (2.0 m·kgf, 14 ft·lbf)
TIP
If a torque wrench is not available when installing a
spark plug, a good estimate of the correct torque is
1/4–1/2 turn past finger tight. However, the spark plug
should be tightened to the specified torque as soon as
possible.
5. Install the spark plug cap.
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Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting
should be left to a Yamaha dealer with the professional
knowledge, specialized data, and equipment to do so
properly.
Engine oil replacement
WARNING
Avoid draining the engine oil immediately after
stopping the engine. The oil is hot and should be
handled with care to avoid burns.
1
2
1. Place the multi-purpose engine on a level surface
and warm up the engine for several minutes. Then
stop the engine and turn the fuel cock lever to
OFF.
4
3
2. Remove the oil filler cap.
1 Oil filler cap
3. Place an oil pan under the engine. Remove the oil
drain bolt and gasket so that the oil can be completely drained.
2 Oil drain bolt
3 Gasket
4. Check the oil drain bolt, oil filler cap and O-ring.
Replace them if damaged.
4 O-ring
5. Install a new gasket and the oil drain bolt and then
tighten the bolt.
Oil drain bolt tightening torque:
(For MZ175, MZ200)
17 Nm (1.7 m·kgf, 12 ft·lbf)
(Except for MZ175, MZ200)
27 Nm (2.7 m·kgf, 20 ft·lbf)
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6. Add engine oil to the correct level.
5 Correct Level
5
NOTICE
Be sure no foreign material enters the crankcase.
700-006a
0˚C
25˚C
A YAMALUBE 4 (10W-40)
D SAE 10W
C SAE #20
32˚F
B SAE #30
80˚F
Recommended engine oil:
A YAMALUBE 4 (10W-40),
SAE 10W-30 or 10W-40
B SAE #30
C SAE #20
D SAE 10W
Recommended engine oil grade:
API Service SE type or higher
Engine oil quantity:
MZ175
0.6 L (0.63 US
MZ200
0.6 L (0.63 US
MZ250
1.0 L (1.06 US
MZ300 (7VB) 1.0 L (1.06 US
MZ300 (7CS) 1.1 L (1.16 US
MZ360
1.1 L (1.16 US
qt,
qt,
qt,
qt,
qt,
qt,
0.53
0.53
0.88
0.88
0.97
0.97
Imp
Imp
Imp
Imp
Imp
Imp
qt)
qt)
qt)
qt)
qt)
qt)
7. Install the oil filler cap.
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A
2
3
1
Air filter
1. Remove the screws, and then remove the air filter
case cover.
1 Screw
2 Air filter case cover
2. Remove the foam element.
3 Foam element
3. Wash the foam element in solvent and dry it.
WARNING
Never use solvent while smoking or in the vicinity
of an open flame.
4. Oil the foam element and squeeze out excess oil.
The foam element should be wet but not dripping.
Recommended oil:
Foam-air-filter oil or engine oil (See page 34)
B
2
3
NOTICE
Do not wring out the foam element when squeezing it. This could cause it to tear.
1
5. Insert the foam element into the air filter case.
TIP
Be sure the foam element sealing surface matches
the air filter case so there is no air leak.
NOTICE
The engine should never run without the foam element; excessive piston and cylinder wear may
result.
6. Install the air filter case cover and tighten the
screws.
A MZ175, MZ200, MZ300 (7CS), MZ360
B MZ250, MZ300 (7VB)
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Spark arrester
WARNING
The engine and muffler will be very hot after the
engine has been run.
Avoid touching the engine and muffler while they
are still hot with any part of your body or clothing
during inspection or repair.
1
(For MZ250, MZ300 (7VB))
1. Remove the screw.
1 Screw
2. Use a flathead screw driver to pry the spark
arrester out from the muffler.
3. Remove the spark arrester.
2
2 Spark arrester
4. Remove the carbon deposits on the spark arrester
using a wire brush.
NOTICE
When cleaning, use the wire brush lightly to avoid
damaging or scratching of the spark arrester.
711-003a
5. Check the spark arrester.
Replace it if damaged.
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6. Install the spark arrester.
TIP
Align the spark arrester lump with the hole in the muffler pipe.
4
3
3 Spark arrester lump
4 Hole
7. Install the screw, and then tighten the screw.
(For MZ175, MZ200, MZ360)
1. Loosen the muffler cap bolt and then remove the
muffler cap and muffler screen.
2
1
1 Muffler cap bolt
2 Muffler cap
3 Muffler screen
3
2. Use a flathead screw driver to pry the spark
arrester out from the muffler.
3. Remove the spark arrester.
4
4 Spark arrester
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4. Remove the carbon deposits on the muffler cap,
muffler screen and spark arrester using a wire
brush.
NOTICE
When cleaning, use the wire brush lightly to avoid
damaging or scratching of the muffler screen and
spark arrester.
5. Check the muffler screen and spark arrester.
Replace them if damaged.
6
5
6. Install the spark arrester.
TIP
Align the spark arrester lump with the hole in the muffler pipe.
5 Spark arrester lump
6 Hole
3
2
7. Install the muffler screen to the muffler cap, then
install the muffler cap to the muffler.
2 Muffler cap
3 Muffler screen
TIP
Install the muffler cap until it contacts with the projection on the muffler.
7
7 Projection
2
8
8. Install the muffler band, then tighten the muffler
cap bolt.
8 Muffler band
Muffler cap bolt tightening torque:
3.5 Nm (0.35 m·kgf, 2.5 ft·lbf)
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Fuel cock
WARNING
1
1
Never use the gasoline while smoking or in the
vicinity of an open flame.
1. Stop the engine.
2. Turn the fuel cock lever to OFF.
1 OFF
3. Remove the fuel cock cup, gasket and fuel strainer.
2 Fuel cock cup
3 Gasket
4 Fuel strainer
4
3
2
4. Clean the cup and fuel strainer with gasoline and
wipe it off.
5. Check the gasket. Replace it if damaged.
6. Install the fuel strainer, gasket and fuel cock cup.
WARNING
Be sure the fuel cock cup is tightened securely.
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Fuel tank filter (For models equipped with a
Yamaha fuel tank)
1
WARNING
Never use the gasoline while smoking or in the
vicinity of an open flame.
2
1. Remove the fuel tank cap and fuel tank filter.
1 Fuel tank cap
2 Fuel tank filter
2. Clean the fuel tank filter with gasoline.
Replace it if damaged.
3. Wipe the fuel tank filter and insert it.
4. Install the fuel tank cap.
WARNING
Be sure the fuel tank cap is tightened securely.
Fuse replacement
(For electric starting model)
WARNING
Be sure to use specified fuse. A wrong fuse will
cause electrical system damage and A FIRE
HAZARD.
NOTICE
Be sure the engine switch is turned to “5” (STOP)
to prevent accidental short circuiting.
1. Remove the screws and then remove the cover.
1 Screw
2 Cover
1
2
779-041
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2. Replace the blown fuse with one of proper amperage.
3
Specified fuse:
10 A
779-042
TIP
If the fuse immediately blows again, consult a Yamaha
dealer.
3 Fuse
3. Install the cover and then tighten the screws.
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STORAGE
Long term storage of your machine will require some
preventive procedures to guard against deterioration.
Drain the fuel
A
1. Turn the engine switch to “OFF”/“5” (STOP).
1
1 “OFF”/“5” (STOP)
A Manual starting model
B Electric starting model
2. Remove the fuel tank cap and fuel tank filter.
Extract the fuel from the fuel tank into an
approved gasoline container using a commercially
available hand siphon. Then, install the fuel tank
filter and fuel tank cap.
B
1
WARNING
763-120b
Fuel is highly flammable and poisonous. Check
“SAFETY INFORMATION” (See page 1) carefully.
NOTICE
Immediately wipe off spilled fuel with a clean, dry,
soft cloth, since fuel may deteriorate painted surfaces or plastic parts.
3. Turn the engine switch to “ON”/“7” (ON).
A
2 “ON”/“7” (ON)
2
B
A Manual starting model
B Electric starting model
2
763-127h
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4. Turn the fuel cock lever to ON.
3 ON
3
5. Start the engine and leave it run until it stops.
The engine stops in approximately 20 minutes
time by running out of fuel.
TIP
Duration of the running engine depends on the
amount of the fuel left in the tank.
6. Drain the fuel from the carburetor into a clean
container by loosening the drain screw on the carburetor float chamber. Pour the drained fuel into
the same approved gasoline container as the fuel
from the fuel tank.
4
4 Drain Screw
7. Turn the engine switch to “OFF”/“5” (STOP).
8. Turn the fuel cock lever to OFF.
9. Tighten the drain screw.
10. Tighten further if any screws, bolts and nuts are
loose.
11. Store the multi-purpose engine in a dry, well-ventilated place, with the cover placed over it.
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Engine
Perform the following steps to protect the cylinder, piston ring, etc. from corrosion.
1. Remove the spark plug, pour about one tablespoon of engine oil (See page 34) into the spark
plug hole and reinstall the spark plug. Recoil start
the engine by turning over several times (with ignition off) to coat the cylinder walls with oil.
2. Pull the recoil starter until you feel compression.
Then stop pulling. (This prevents the cylinder and
valves from rusting).
3. Clean exterior of the multi-purpose engine and
apply a rust inhibitor.
4. Store the multi-purpose engine in a dry, well-ventilated place, with the cover placed over it.
5. The multi-purpose engine must remain in a vertical position when stored, carried or operated.
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TROUBLESHOOTING
Engine won’t start
1. Fuel systems
No fuel supplied to combustion chamber.
2 No fuel in tank .... Supply fuel.
2 Fuel in tank .... Fuel cock lever to ON.
1 ON
2 Clogged fuel line .... Clean fuel line.
2 Foreign matter in fuel cock .... Clean fuel cock.
2 Clogged carburetor .... Clean carburetor.
1
2. Engine oil system
Insufficient
2 Oil level is low .... Add engine oil.
700-006
3. Electrical systems
2 (Manual starting model) Engine switch to “ON”
and pull the recoil starter.
2 “ON”
2
2
2 (Electric starting model) Engine switch to “6”
(START).
2 “6” (START)
763-120a
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Poor spark
2 Spark plug dirty with carbon or wet .... Remove
carbon or wipe spark plug dry.
2 Faulty ignition system .... Consult a Yamaha dealer.
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(Manual starting model)
A
ENGINE DOES NOT START
B
Turn the engine switch to “ON”, then pull
the recoil starter and check if the oil
warning light flickers.
E
C
H
Does not flicker
D
Check engine oil level.
Flickers
Pull the recoil starter and check the
spark plug for spark strength.
(See “WARNING”)
F
OK
Consult a
Yamaha dealer.
G
Level low
Add engine oil.
WARNING
9 To prevent FIRE HAZARDS be
sure fuel is not present in the
spark plug area.
9 To prevent FIRE HAZARDS be
sure to place the spark plug as
far away as possible from the
spark plug hole and carburetor
area.
9 To prevent ELECTRIC SHOCK do
not hold spark plug lead with
hand while testing.
I
OK
J
K
Check the spark plug.
9 Type: BPR4ES
9 Gap: 0.7–0.8 mm (0.028–0.031 in)
L
Incorrect
Replace or
adjust gap.
Does not spark
Q
N
M
OK
Clean the spark
plug.
Check the following.
9 Fuel line clogging
9 Air filter element
clogging.
O
Clogged
P
OK
T
Clean
or
replace.
R
OK
S Engine does not start.
Consult a Yamaha dealer.
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(Electric starting model)
A
ENGINE DOES NOT START
B
Turn the engine switch to “7” (ON),
then turn the engine switch to “6”
(START). And check if the starter motor
cranks.
C
F
Cranks
D
Turn the engine switch to “6” (START),
and check if the oil warning light comes
on.
Does not crank
P34-1.art
G Does not come on H
L
Turn the engine switch to “6” (START)
and check the spark plug for spark
strength.
(See “WARNING”).
OK
M
WARNING
P34-2.art
9 To prevent FIRE HAZARDS be
sure fuel is not present in the
spark plug area.
9 To prevent FIRE HAZARDS be
sure to place the spark plug as
far away as possible from the
spark plug hole and carburetor
area.
9 To prevent ELECTRIC SHOCK do
not hold spark plug lead with
hand while testing.
N
Does not spark.
U
R
Check the following
9 Fuel cock clogging
9 Air cleaner element
clogging.
S
Clogged
T
OK
Comes on
X
Clean
or
replace
V
OK
W Engine does not start.
Consult a Yamaha dealer.
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E Faulty battery and/or starter motor.
Consult a Yamaha dealer.
I
Check engine oil level.
J
OK
Consult a
Yamaha dealer.
O
P
K
Level low
Add engine oil.
Check the spark plug.
9 Type: BPR4ES
9 Gap: 0.7–0.8 mm (0.028–0.031 in)
Incorrect
Replace or
adjust gap.
Q
OK
Clean the spark
plug.
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SPECIFICATIONS
Dimensions
Unit
Overall length
Overall width
Overall height
Dry weight
mm (in)
mm (in)
mm (in)
kg (lb)
Unit
Overall length
Overall width
Overall height
Dry weight
mm (in)
mm (in)
mm (in)
kg (lb)
Unit
Overall length
Overall width
Overall height
Dry weight
mm (in)
mm (in)
mm (in)
kg (lb)
Unit
Overall length
Overall width
Overall height
Dry weight
mm (in)
mm (in)
mm (in)
kg (lb)
Unit
Overall length
Overall width
Overall height
Dry weight
mm (in)
mm (in)
mm (in)
kg (lb)
MZ175
MZ175
MZ175
7CN
7CN
7CP
With fuel tank model Without fuel tank model With fuel tank model
326 (12.83)
337 (13.27)
317 (12.48)
352 (13.86)
352 (13.86)
361 (14.21)
407 (16.02)
238 (9.37)
407 (16.02)
13–20 (29–44)
13–20 (29–44)
13–20 (29–44)
MZ200
MZ200
MZ250
7DH
7DH
7KB
With fuel tank model Without fuel tank model With fuel tank model
326 (12.83)
337 (13.27)
387 (15.24)
352 (13.86)
352 (13.86)
426 (16.77)
407 (16.02)
238 (9.37)
464 (18.27)
13–20 (29–44)
13–20 (29–44)
20–27 (44–60)
MZ250
MZ300
MZ300
7KB
7VB
7VB
Without fuel tank model With fuel tank model Without fuel tank model
404 (15.91)
387 (15.24)
404 (15.91)
416 (16.38)
426 (16.77)
416 (16.38)
294.5 (11.59)
464 (18.27)
294.5 (11.59)
20–27 (44–60)
20–27 (44–60)
20–27 (44–60)
MZ300
MZ360
MZ360
7CS
7CT
7CT
Without fuel tank model With fuel tank model Without fuel tank model
443 (17.44)
425 (16.73)
443 (17.44)
470 (18.50)
451 (17.76)
452 (17.80)
327 (12.87)
485 (19.09)
306 (12.05)
31–40 (68–88)
31–40 (68–88)
31–40 (68–88)
MZ360
MZ360
7BY
7CN
Without fuel tank model Without fuel tank model
381 (15.00)
443 (17.44)
436 (17.17)
470 (18.50)
319 (12.56)
327 (12.87)
31–40 (68–88)
31–40 (68–88)
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Engine
MZ175
MZ175
7CN
7CN
With fuel tank model Without fuel tank model
Type
Air cooled 4-stroke Air cooled 4-stroke
gasoline
gasoline
OHV
OHV
Cylinder arrangement
Inclined, 1 cylinder Inclined, 1 cylinder
Displacement
cm3
171
171
Bore × stroke
mm (in)
66.0 × 50.0
66.0 × 50.0
(2.60 × 1.97)
(2.60 × 1.97)
Fuel
Unleaded gasoline Unleaded gasoline
Fuel tank capacity L (US gal,
4.0
—
Imp gal)
(1.06, 0.88)
Engine oil quantity L (US qt,
0.6
0.6
Imp qt)
(0.63, 0.53)
(0.63, 0.53)
Ignition system
TCI
TCI
Spark plug: Type
BPR4ES (NGK)
BPR4ES (NGK)
Gap
mm (in)
0.7–0.8
0.7–0.8
(0.028–0.031)
(0.028–0.031)
MZ175
7CP
With fuel tank model
Air cooled 4-stroke
gasoline
OHV
Inclined, 1 cylinder
171
66.0 × 50.0
(2.60 × 1.97)
Unleaded gasoline
4.0
(1.06, 0.88)
0.6
(0.63, 0.53)
TCI
BPR4ES (NGK)
0.7–0.8
(0.028–0.031)
MZ200
MZ200
7DH
7DH
With fuel tank model Without fuel tank model
Type
Air cooled 4-stroke Air cooled 4-stroke
gasoline
gasoline
OHV
OHV
Cylinder arrangement
Inclined, 1 cylinder Inclined, 1 cylinder
Displacement
cm3
192
192
Bore × stroke
mm (in)
70.0 × 50.0
70.0 × 50.0
(2.76 × 1.97)
(2.76 × 1.97)
Fuel
Unleaded gasoline Unleaded gasoline
Fuel tank capacity L (US gal,
4.0
—
Imp gal)
(1.06, 0.88)
Engine oil quantity L (US qt,
0.6
0.6
Imp qt)
(0.63, 0.53)
(0.63, 0.53)
Ignition system
TCI
TCI
Spark plug: Type
BPR4ES (NGK)
BPR4ES (NGK)
Gap
mm (in)
0.7–0.8
0.7–0.8
(0.028–0.031)
(0.028–0.031)
MZ250
7KB
With fuel tank model
Air cooled 4-stroke
gasoline
OHV
Inclined, 1 cylinder
253
74.0 × 59.0
(2.91 × 2.32)
Unleaded gasoline
5.5
(1.45, 1.21)
1.0
(1.06, 0.88)
TCI
BPR4ES (NGK)
0.7–0.8
(0.028–0.031)
Unit
Unit
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MZ250
7KB
Without fuel tank model
Type
Air cooled 4-stroke
gasoline
OHV
Cylinder arrangement
Inclined, 1 cylinder
Displacement
cm3
253
Bore × stroke
mm (in)
74.0 × 59.0
(2.91 × 2.32)
Fuel
Unleaded gasoline
Fuel tank capacity L (US gal,
—
Imp gal)
Engine oil quantity L (US qt,
1.0
Imp qt)
(1.06, 0.88)
Ignition system
TCI
Spark plug: Type
BPR4ES (NGK)
Gap
mm (in)
0.7–0.8
(0.028–0.031)
MZ300
MZ300
7VB
7VB
With fuel tank model Without fuel tank model
Air cooled 4-stroke Air cooled 4-stroke
gasoline
gasoline
OHV
OHV
Inclined, 1 cylinder Inclined, 1 cylinder
296
296
80.0 × 59.0
80.0 × 59.0
(3.15 × 2.32)
(3.15 × 2.32)
Unleaded gasoline Unleaded gasoline
5.5
—
(1.45, 1.21)
1.0
1.0
(1.06, 0.88)
(1.06, 0.88)
TCI
TCI
BPR4ES (NGK)
BPR4ES (NGK)
0.7–0.8
0.7–0.8
(0.028–0.031)
(0.028–0.031)
MZ300
7CS
Without fuel tank model
Type
Air cooled 4-stroke
gasoline
OHV
Cylinder arrangement
Inclined, 1 cylinder
Displacement
cm3
301
Bore × stroke
mm (in)
78.0 × 63.0
(3.07 × 2.48)
Fuel
Unleaded gasoline
Fuel tank capacity L (US gal,
—
Imp gal)
Engine oil quantity L (US qt,
1.1
Imp qt)
(1.16, 0.97)
Ignition system
TCI
Spark plug: Type
BPR4ES (NGK)
Gap
mm (in)
0.7–0.8
(0.028–0.031)
MZ360
MZ360
7CT
7CT
With fuel tank model Without fuel tank model
Air cooled 4-stroke Air cooled 4-stroke
gasoline
gasoline
OHV
OHV
Inclined, 1 cylinder Inclined, 1 cylinder
357
357
85.0 × 63.0
85.0 × 63.0
(3.35 × 2.48)
(3.35 × 2.48)
Unleaded gasoline Unleaded gasoline
6.1
—
(1.61, 1.34)
1.1
1.1
(1.16, 0.97)
(1.16, 0.97)
TCI
TCI
BPR4ES (NGK)
BPR4ES (NGK)
0.7–0.8
0.7–0.8
(0.028–0.031)
(0.028–0.031)
Unit
Unit
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MZ360
7BY
Without fuel tank model
Type
Air cooled 4-stroke
gasoline
OHV
Cylinder arrangement
Inclined, 1 cylinder
Displacement
cm3
357
Bore × stroke
mm (in)
85.0 × 63.0
(3.35 × 2.48)
Fuel
Unleaded gasoline
Fuel tank capacity L (US gal,
—
Imp gal)
Engine oil quantity L (US qt,
1.1
Imp qt)
(1.16, 0.97)
Ignition system
TCI
Spark plug: Type
BPR4ES (NGK)
Gap
mm (in)
0.7–0.8
(0.028–0.031)
Unit
MZ360
7CN
Without fuel tank model
Air cooled 4-stroke
gasoline
OHV
Inclined, 1 cylinder
357
85.0 × 63.0
(3.35 × 2.48)
Unleaded gasoline
—
1.1
(1.16, 0.97)
TCI
BPR4ES (NGK)
0.7–0.8
(0.028–0.031)
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CONSUMER INFORMATION
Identification number records
PRI-I.D. NUMBER:
MODEL
PRI-I.D.
CODE
SERIAL No.
Record your Primary I.D., and serial numbers in the spaces provided, to assist you
in ordering spare parts from a Yamaha
dealer.
Also record and keep these I.D. numbers
in a separate place in case your machine
is stolen.
Machine identification
The machine serial number is stamped in
the location as shown.
TIP
The first three digits of these numbers are
for model identification; the remaining digits are the unit production number. Keep a
record of these numbers for reference
when ordering parts from a Yamaha dealer.
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EXHAUST EMISSION CONTROL SYSTEM AND
COMPONENTS
Item
Acronym
9 CARB. ASSY., LH. & JT., ....................... CARB (Carburetor)
CARBURETOR2
9 T.C.I. MAGNETO ASSY. & ..................... EI (Electronic Ignition)
PLUG, SPARK
9 CRANKCASE1 & HEAD, ....................... PCV (Positive Crankcase
CYLINDER1
Ventilation)
9 AIR FILTER ASSY. . ................................ ACL (Air Cleaner)
9 MUFF., 2, CAP, NET, WIRE2 &
ARRESTER, SPARK
The above items and the corresponding acronyms are provided in accordance with U.S.
EPA REGULATIONS FOR NEW NONROAD SPARK-IGNITION NONHANDHELD
ENGINES and the CALIFORNIA REGULATIONS FOR 1995 AND LATER SMALL OFFROAD ENGINES.
The acronyms conform to the latest version of the SAE’s recommended practice document J1930, “Diagnostic Acronyms, Terms, and Definitions For Electrical/Electronic
System”.
It is recommended that these items be serviced by a Yamaha dealer.
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