Generator
OWNER’S MANUAL
EF2400iS
LIT-19626-01-23
7CF-28199-10
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AE00002
INTRODUCTION
Congratulations on your purchase of your new Yamaha.
This manual will provide you with a good basic understanding of the operation and main-
tenance of this machine.
If you have any questions regarding the operation or maintenance of your machine,
please consult a Yamaha dealer.
AE00012
PRI-I.D. NUMBER
IDENTIFICATION NUMBER RECORDS
Record your Primary I.D., and serial num-
bers in the spaces provided, to assist you
MODEL
in ordering spare parts from a Yamaha
dealer.
PRI-I.D.
Also record and keep these I.D. numbers in
a separate place in case your machine is
stolen.
SERIAL No.
CODE
AE00011
MACHINE IDENTIFICATION
The machine serial number is stamped in
the location as shown.
NOTE:
The first three digits of these numbers are
for model identification; the remaining dig-
its are the unit production number. Keep a
record of these numbers for reference
when ordering parts from aYamaha dealer.
7CH-24163-**
790-072
AE00022
EF2400iS
OWNER’S MANUAL
© 2005 by Yamaha Motor Corporation, U.S.A.
1st Edition, February 2005
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in Japan.
P/N LIT-19626-01-23
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AE00032
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PLEASE READ AND UNDERSTAND
THIS MANUAL COMPLETELY BEFORE
OPERATING THE MACHINE.
Particularly important information is distin-
guished in this manual by the following
notations.
NOTE:
9 Yamaha continually seeks advance-
ments 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 engine and this manual. If there is
any question concerning this manual,
please consult your Yamaha dealer.
9 This manual should be considered a
permanent part of this engine and
should remain with this engine when
resold.
-
The Safety Alert Symbol means ATTEN-
TION! BECOME ALERT! YOUR SAFETY
IS INVOLVED!
w
Failure to follow WARNING instructions
could result in severe injury or death to the
engine operator, a bystander, or a person
inspecting or repairing the engine.
cC
A CAUTION indicates special precautions
that must be taken to avoid damage to the
engine.
NOTE:
A NOTE provides key information to make
procedures easier or clearer.
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AE00041
CONTENTS
PERIODIC MAINTENANCE .................20
MAINTENANCE CHART ...................20
SPARK PLUG INSPECTION .............22
CARBURETOR ADJUSTMENT.........22
ENGINE OIL REPLACEMENT ..........23
LIMITED WARRANTY (EF- AND
EDL-SERIES)..........................................1
LOCATION OF IMPORTANT LABELS ..3
SAFETY INFORMATION........................5
EXHAUST FUMES ARE
POISONOUS .......................................5
MUFFLER SCREEN AND SPARK
ARRESTER .......................................24
FUEL IS HIGHLY FLAMMABLE AND
POISONOUS .......................................5
AIR FILTER........................................26
FUEL TANK FILTER...........................27
TROUBLESHOOTING..........................28
STORAGE.............................................30
DRAIN THE FUEL .............................30
ENGINE .............................................30
ENGINE AND MUFFLER MAY
BE HOT................................................5
ELECTRIC SHOCK PREVENTION.....6
CONNECTION NOTES .......................7
CONNECTION.....................................7
EXTENSION CORD NOTES ...............7
CONTROL FUNCTION...........................8
DESCRIPTION ....................................8
CONTROL PANEL...............................8
OIL WARNING SYSTEM .....................9
ENGINE SWITCH................................9
DC PROTECTOR ................................9
PRE-OPERATION CHECK...................10
FUEL..................................................10
ENGINE OIL ......................................11
GROUND (Earth)...............................11
OPERATION .........................................12
STARTING THE ENGINE ..................12
APPLICATION RANGE......................14
CONNECTION...................................15
STOPPING THE ENGINE..................19
EXHAUST EMISSION CONTROL
SYSTEM AND COMPONENTS............31
SPECIFICATIONS.................................32
DIMENSIONS ....................................32
ENGINE .............................................32
GENERATOR.....................................32
WIRING DIAGRAM...............................33
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AE01120
YAMAHA MOTOR CORPORATION U.S.A.
EF- AND EDL-SERIES GENERATOR LIMITED WARRANTY
Yamaha Motor Corporation, U.S.A. hereby warrants
that new Yamaha consumer generators purchased
from an authorized Yamaha consumer generator
dealer in the continental United States will be free
from defects in material and workmanship for the
period of time stated herein, subject to certain stat-
ed limitations.
2. Give notice to an authorized Yamaha con-
sumer generator dealer of any and all apparent
defects within ten (10) days after discovery,
and make the unit available at that time for
inspection and repairs at such dealer’s place of
business.
WARRANTY TRANSFER: To transfer the warranty
from the original purchaser to any subsequent pur-
chaser(s), it is imperative that the unit be inspected
and registered for warranty by an authorized
Yamaha consumer generator dealer. In order for
this warranty to remain in effect, this inspection and
registration must take place within ten (10) days
after transfer. An inspection and registration fee will
be charged for this service. In no case will the war-
ranty be extended beyond the original period.
THE PERIOD OF WARRANTY Any new EF-series
or EDL-series Yamaha Generator purchased for
private, non-commercial use from an authorized
Yamaha consumer generator dealer in the conti-
nental United States will
be warranted against defects in material or work-
manship for a period two (2) years from date of pur-
chase, subject to exclusions noted herein. Any
Yamaha non-commercial
generator purchased and utilized for commercial or
rental applications will be warranted for a period
one (1) year from the date of purchase, subject to
exclusions noted herein.
YAMAHA MOTOR CORPORATION, U.S.A. MAKES
NO OTHER WARRANTY OF ANY KIND,
EXPRESSED OR IMPLIED. ALL IMPLIED WAR-
RANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE WHICH EXCEED
THE OBLIGATIONS AND TIME LIMITS STATED IN
THIS WARRANTY ARE HEREBY DISCLAIMED BY
YAMAHA MOTOR CORPORATION, U.S.A. AND
EXCLUDED FROM THIS WARRANTY.
DURING THE PERIOD OF WARRANTY any
authorizedYamaha consumer generator dealer will,
free of charge, repair or replace, at Yamaha’s
option, any part adjudged defective by Yamaha due
to faulty workmanship or material from the factory.
Parts used in warranty repairs will be warranted for
the balance of the product’s warranty period. All
parts replaced under warranty become property of
Yamaha Motor Corporation U.S.A.
SOME STATES DO NOT ALLOW LIMITATIONS ON
HOW LONG AN IMPLIED WARRANTY LASTS, SO
THE ABOVE LIMITATION MAY NOT APPLY TO YOU.
ALSO EXCLUDED FROM THIS WARRANTY ARE
ANY INCIDENTAL OR CONSEQUENTIAL DAM-
AGES INCLUDING LOSS OF USE. SOME STATES
DO NOT ALLOW THE EXCLUSION OR LIMITATION
OF INCIDENTAL OR CONSEQUENTIAL DAMAGES,
SO THE ABOVE EXCLUSION MAY NOT APPLY TO
YOU.
GENERAL EXCLUSIONS from this warranty shall
include any failures caused by:
a. Installation of parts or accessories that are not
qualitatively equivalent to genuine Yamaha
parts.
b. Abnormal strain, neglect, or abuse.
c. Lack of proper maintenance.
d. Accident or collision damage.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS, AND YOU MAY ALSO HAVE OTHER
RIGHTS WHICH VARY FROM STATE TO STATE.
SPECIFIC EXCLUSIONS from this warranty shall
include parts replaced due to normal wear or rou-
tine maintenance.
YAMAHA MOTOR CORPORATION, U.S.A.
Post Office Box 6555
THE CUSTOMER’S RESPONSIBILITY under this
warranty shall be to:
Cypress, California 90630
1. Operate and maintain the generator as speci-
fied in the appropriate Owner’s Manual;
– 1 –
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WARRANTY QUESTIONS AND ANSWERS
Q. What costs are my responsibility during the
Q. Is the warranty transferable to second owners?
A. Yes. The remainder of the existing warranty
can be transfered upon request.
warranty period?
A. The customer’s responsibility includes all costs
of normal maintenance service, non-warranty
repairs, accident damages, as well as oil and
spark plugs.
The unit has to be inspected and reregistered
by an authorized Yamaha generator dealer for
the policy to remain effective.
Q. What are some examples of “abnormal” strain,
neglect, or abuse?
CUSTOMER SERVICE
A. These terms are general and overlap each
other in areas. Specific examples include:
Running the machine out of oil; lack of proper
maintenance; operating the machine with a
broken or damaged part which causes anoth-
er part to fail; and so on. If you have any spe-
cific questions on operation or maintenance,
please contact your dealer for advice.
If your machine requires warranty service, you
must take it to any authorized Yamaha generator
dealer within the continental United States. Be sure
to bring your warranty registration identification or
other valid proof of the original date of purchase. If
a question or problem arises regarding warranty,
first contact the owner of the dealership. Since all
warranty matters are handled at the dealer level,
this person is in the best position to help you. If you
are still not satisfied and require additional assis-
tance, please write:
Q. Does the warranty cover incidental costs such
as transportation due to a failure?
A. No. The warranty is limited to repair of the
machine itself.
YAMAHA MOTOR CORPORATION U.S.A.
CUSTOMER RELATIONS DEPARTMENT
P.O. BOX 6555
Q. May I perform any or all of the recommended
maintenance shown in the Owner’s Manual
instead of having the dealer do them?
A. Yes, if you are a qualified mechanic and follow
the procedures specified in the Owner’s and
Service Manual. We do recommend, however,
that items requiring special tools or equipment
be done by a Yamaha generator dealer.
Cypress, California 90630
CHANGE OF ADDRESS
The federal government requires each manufactur-
er to maintain a complete, up-to-date list of all first
purchasers against the possibility of a safety-relat-
ed defect and recall. This list is compiled from the
purchase registrations sent to Yamaha Motor
Corporation, U.S.A. by the selling dealer at the time
of your purchase. If you should move after you have
purchased your new generator, please advise us of
your new address by sending a postcard listing
your Yamaha model name, engine number, dealer
number (or dealer’s name) as it is shown on your
warranty identification, your name and new mailing
address. Mail to:
Q. Will the warranty be void or cancelled if I do not
operate or maintain my newYamaha exactly as
specified in the Owner’s Manual?
A. No. The warranty on a new Yamaha cannot be
“voided” or “cancelled.”
However, if a particular failure is caused by
operation or maintenance other than as
shown in the Owner’s Manual, that failure
may not be covered under warranty.
Q. What responsibility does my dealer have under
this warranty?
A. Each Yamaha generator dealer is expected to:
1. Check the operation of the generator
before sale.
YAMAHA MOTOR CORPORATION, U.S.A.
WARRANTY DEPARTMENT
P.O. Box 6555
Cypress, California 90630
2. Explain the operation, maintenance, and
warranty requirements to your satisfaction
at the time of sale, and upon your request
at any later date.
This will ensure that Yamaha Motor Corporation,
U.S.A. has an up-to-date registration record in
accordance with federal law.
In addition, each Yamaha generator dealer is
held responsible for his setup, service and war-
ranty repair work.
– 2 –
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AE00062
LOCATION OF IMPORTANT LABELS
Please read the following labels carefully before oper-
ating this machine.
NOTE:
Maintain or replace safety and instruction labels, as
necessary.
1
4
3
2
792-063
3
4
792-064
– 3 –
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1
2
OIL
HOT EXHAUST
***-28176-**
zzzzzz
zz
AC output
Rated
Hz
zzz
KVA
V
zzz
Phase
DC output
Fuel
Single
zz
zz
V
Gasoline
A
YAMAHA MOTOR CO., LTD.
MADE IN JAPAN
***-24164-**
3
(
)
IMPORTANT ENGINE INFORMATION
y
ENGINE AIR INDEX C a l i f o r n i a o n l
ENGINE FAMILY : zzzzzzzzzzzz
E M
REFER TO OWNER'S MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
MOST 0C L E A N
N O T E
T H I S E N G I N E
F O R T H E F O L L O W I N G U S E :
2
4
6
8
LEAS1T 0
DISPLACEMENT
IGNITION TIMING
IDLE SPEED
FUEL
ENGINE OIL
THIS ENGINE MEETS zzzz-zzzz CALIFORNIA EMISSION REGULATIONS FOR SMALL OFF-ROAD ENGINES.
THIS ENGINE CONFORMS TO PHASE U.S.EPA REGULATIONS FOR SMALL NONROAD ENGINES.
:
VALVE LASH
(A)
IN
:
EX:
J
CLEAN
z.zz~z.zz
z.zz~z.zz
zzz
:
&
IDLE MIXTURE
NO OTHER ADJUSTMENTS NEEDED.
T H E L O W E R T H E A I R
I N D E X , T H E L E S S
T H E P O L L U T I O N
:
rpm
AT NO LOAD
I S C E R T I F I E D
T O B E E M I S S I O N C O M P L I A N T
zzzz~zzzz
:
THIS ENGINE IS CERTIFIED TO OPERATE ON UNLEADED GASOLINE.
TYPE
:
INTERMEDIATE
SAE 10W
-
30
MODERATE
EXTENDED
SE
CHECK OWNERS MANUAL FOR FURTHER D E T A I L S
L A B E L B E REMOVED B Y U L T I M A T E P U R C H A S E R O N L Y !
-2179R-00
2
T
H
I
S
T
O
T
H
E
EMISSIONS COMPLIANCE PERIOD:CATEGORY
A
(EPA)
YAMAHA MOTOR CO. LTD zzz
4
q
q
WARNING
AVERTISSEMENT
LISEZ LE MODE D’EMPLOI ET TOUTES LES ETIQUETTES AVANT DE
FAIRE FONCTIONNER LA MACHINE.
FAITES FONCTIONNER UNIQUEMENT DANS DES LIEUX BIEN AERES.
8
8
READ THE OWNER’S MANUAL AND ALL LABELS BEFORE OPERATING.
8
8
ONLY OPERATE IN WELL-VENTILATED AREAS.
EXHAUST GAS CONTAINS POISONOUS CARBON MONOXIDE.
CHECK FOR SPILLED FUEL OR FUEL LEAKS.
STOP ENGINE BEFORE REFUELING.
LES GAZ D’ECHAPPEMENT CONTIENNENT DU MONOXYDE DE CARBONE.
8 VERIFIEZ SI DU CARBURANT A ETE RENVERSE OU S’IL FUIT.
8
8
8
ARRETEZ LE MOTEUR AVANT DE FAIRE LE PLEIN DE CARBURANT.
N’UTILISEZ PAS A PROXIMITE DE MATERIAUX INFLAMMABLES.
8
8
DO NOT OPERATE NEAR FLAMMABLE MATERIALS.
ELECTROCUTION CAN OCCUR IF GENERATOR IS USED IN RAIN,
SNOW, OR NEAR WATER. KEEP THIS UNIT DRY AT ALL TIMES.
IL Y A RISQUE D’ELECTROCUTION SI LE GENERATEUR FONCTIONNE
SOUS LA PLUIE, DANS LA NEIGE, OU PRES DE L’EAU. GARDEZ LA
8
8
MACHINE AUSEC EN TOUTES CIRCONSTANCES.
7CF-24162-10
– 4 –
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AE00071
AE00072
SAFETY INFORMATION
EXHAUST FUMES ARE POISONOUS
9 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.
741-112
AE00075
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.
741-113
9 Take care not to spill any fuel on the engine or muf-
fler when refuelling.
9 If you swallow any fuel, inhale fuel vapor, or allow
any to get in your eye(s), see your doctor immedi-
ately. If any fuel spills on your skin or clothing,
immediately wash with soap and water and change
your clothes.
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.
741-114
741-115
AE00843
ENGINE AND MUFFLER MAY BE HOT
9 Place the machine in a place where pedestrians or
children are not likely to touch the machine.
741-116
9 Avoid placing any flammable materials near the
exhaust outlet during operation.
741-117
– 5 –
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9 Keep the machine at least 1 m (3 ft) from buildings
a
or other equipment, or the engine may overheat.
a 1 m (3 ft)
741-118
9 Avoid operating the engine with a dust cover.
741-119
9 Be sure to carry the generator only by its carrying
1
handle(s).
1 Carrying handle(s) (shaded)
741-124
AE00083
ELECTRIC SHOCK PREVENTION
9 Never operate the engine in rain or snow.
741-120
741-121
741-125
9 Never touch the machine with wet hands or electri-
cal shock will occur.
9 Be sure to ground (earth) the generator.
NOTE:
Use ground (earth) lead of sufficient current capacity.
1
1 Lead diameter
– 6 –
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Ground (earth) Lead
Diameter:
0.12 mm (0.005 in)/ampere
EX;
10 Ampere → 1.2 mm (0.05 in)
AE01181
CONNECTION NOTES
9 Avoid connecting the generator to commercial
1
2
power outlet.
1 Correct
2 Incorrect
AE00091
CONNECTION
w
Before the generator can be connected to a build-
ing’s electrical system, a licensed electrician must
install an isolation (transfer) switch in the build-
ing’s main fuse box. The switch is the connection
point for generator power and allows selection of
generator or main line power to the building. This
will prevent the generator from charging the main
power line (backfeeding) when the main power sup-
ply has failed or has been turned off for line repair.
Backfeeding can electrocute or injure line mainte-
nance personnel. Also, generator and building
electrical system damage can occur when normal
operating power returns if unit is used without an
isolation switch.
1
741-122
AE00086
EXTENSION CORD NOTES
9 When using an extension cord, its total length
should not exceed
60 meters for cross section of 1.5 mm square
and
100 meters for cross section of 2.5 mm square.
9 This extension cord should be protected by a tough
flexible rubber sheath (IEC 245) or the equivalent
to withstand mechanical stresses.
– 7 –
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AE00101
CONTROL FUNCTION
1
23
1
AE00102
DESCRIPTION
1 Carrying handles (shaded)
2 Fuel level gauge
3 Fuel tank cap
4 Oil filler cap
5 Recoil starter
6 Fuel cock
7 Muffler
6
5
4
793-146
AE00103
1
3 2
1
CONTROL PANEL
1 Engine switch
2 Twin Tech (parallel running terminal)
3 DC protector
4 Oil warning light
5 AC pilot light
6 Overload indicator light
7 AC receptacle
8 DC receptacle
9 Ground (Earth) terminal
7
793-147
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e
t
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r
u
o
i
793-148
– 8 –
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AE00111
OIL WARNING SYSTEM
When the oil level falls below the lower level, the engine
stops automatically. Unless you refill with oil, the engine
will not start again.
NOTE:
If the engine stalls or does not start, turn the engine
switch to “ON” position 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.
AE00124
ENGINE SWITCH
700-121
The engine switch controls the ignition system.
1
7
“ON”
Ignition circuit is switched on.
The engine can be started.
q
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2
5
“STOP”
Ignition circuit is switched off.
The engine will not run.
AE00780
763-259
DC PROTECTOR
The DC protector turns off automatically when the load
exceeds the generator rated output.
cC
Reduce the load to the specified generator rated
output if the DC protector turns off. If it turns off
again, consult a Yamaha dealer.
763-260
NOTE:
Press to reset the DC protector.
1
2
I
3
“ON”
“OFF”
w
q
AE01179
TWIN TECH
(TERMINAL FOR CONNECTING SPECIAL CABLES
FOR PARALLEL RUNNING )
763-238a
This is the terminal for connecting special cables for par-
allel running of two EF2400iS. The parallel running
requires two EF2400iS and the special cables. (The
rated output in parallel running is 3.6 kVA and the rated
current is 30.0 A.)
The handling, operation procedure and the notes on
usage are described in the PARALLEL RUNNING KIT
OWNER’S MANUAL included in the Parallel Running Kit.
Consult a Yamaha dealer for this Parallel Running Kit.
763-263
– 9 –
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AE00845
PRE-OPERATION CHECK
NOTE:
Pre-operation checks should be made each time the
generator is used.
w
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.
741-123
AE00856
FUEL
Make sure there is sufficient fuel in the tank.
Recommended fuel:
Unleaded gasoline
Fuel tank capacity:
q
707-033c
Total: 6.0 L (1.32 Imp gal, 1.59 US 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.
707-106
1 Fuel level gauge
“F”
“E”
Full
Empty
w
9 Fuel is highly flammable and poisonous. Check
“SAFETY INFORMATION” (See page 5) careful-
ly before refueling.
707-037
9 Do not fill above the top of the fuel filter or it
may overflow when the fuel heats up later and
expands.
9 Wipe up any spilled fuel immediately.
9 After refueling, make sure the tank cap is tight-
ened securely.
707-107
– 10 –
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AE00222
ENGINE OIL
Make sure the engine oil is at the upper level of the oil
filler hole.
Add oil as necessary.
700-128
1 Upper level
Recommended oil:
q
å
YAMALUBE 4 (10W-30) or SAE 10W-30
type SE motor oil
SAE #30
SAE #20
∫
ç
∂
700-103c
SAE 10W
Engine oil quantity:
0°C
25°C
0.6 L (0.53 lmp qt, 0.63 US qt)
A YAMALUBE 4(10W-30)
NOTE:
D SAE 10W
C SAE #20
B SAE #30
Recommended engine oil classification:
API Service “SE” or “SF”.
32°F
80°F
700-065
cC
The generator has been shipped without engine oil.
Fill with oil or it will not start.
700-006
AE00241
GROUND (Earth)
Make sure to ground (earth) the generator.
Check “SAFETY INFORMATION” on page 6.
741-126
– 11 –
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AE00955
OPERATION
a
NOTE:
The generator has been shipped without engine oil. Fill
with oil or it will not start.
700-006a
1 Upper level
AE01171
STARTING THE ENGINE
NOTE:
761-085
9 Before starting the engine, do not connect any
electric devices.
1. Turn the fuel cock lever to the “ON” position.
1 “ON”
1
705-075
2. Pull the choke knob fully out.
2
2 Choke knob
NOTE:
The choke is not required to start a warm engine.
Push the choke knob in to the original position.
701-051
e
3. Turn the engine switch to the “7” (ON) position.
3
7
“ON”
763-261
– 12 –
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4. Pull slowly on the recoil starter until it is engaged,
then pull it briskly.
5. After the engine starts, warm up the engine until
the engine does not stop when the choke knob is
returned to the original position.
704-019
6. Push the choke knob back to the original position.
NOTE:
When starting the engine in areas where the ambient
temperature is below 0°C (32°F), the engine automati-
cally operates at the rated r/min (3,200 r/min) for three
minutes to warm up the engine
701-051a
– 13 –
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AE01180
APPLICATION RANGE
AC
DC
0.4–0.75
(Efficiency 0.85)
Power factor
1
0.8–0.95
–1,600W
Rated voltage
12V
Rated current
8A
EF2400iS
–2,000W
–680W
NOTE:
9 “–” means below.
9 Application wattage indicates when each device is
used by itself.
9 The overload indicator light 1 comes on when
total wattage exceeds the application range. (See
page 16 for more details.)
cC
q
9 Be sure the total load is within generator rated
output otherwise generator damage will occur.
9 Do not use AC and DC power at the same time
or the generator may be damaged.
760-029
NOTE:
Some precision equipment is voltage sensitive and may
require a more uniform voltage supply than portable
generators provide. Examples include some medical
equipment, personal computers, and some inverters
that sense peak and RMS voltage values. Consult the
precision-equipment vendor before relying on any
portable generator to provide power to such equipment.
– 14 –
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AE01172
CONNECTION
Alternating Current (AC)
cC
9 Be sure all electric devices including the lines
and plug connections are in good condition
before connection to the generator.
9 Be sure any electric devices are turned off
before plugging it in.
9 Be sure the total load is within generator rated
output.
9 Be sure the receptacle load current is within
receptacle rated current.
761-086
1. Wind the power lead 2 or 3 turns around handle.
2. Start the engine.
3. Plug in to the AC receptacle.
761-085a
4. Make sure the AC pilot light is on.
1 AC pilot light
q
5. Turn on any electric devices.
760-030
– 15 –
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AE00788
Overload indicator light
q
The overload indicator light 1 comes on when an over-
load of a connected electrical device is detected, the
inverter control unit overheats, or the AC output voltage
rises.The electronic breaker will then activate, stopping
power generation in order to protect the generator and
any connected electric devices. The AC pilot light
(green) will go off and the overload indicator light (red)
will stay on, but the engine will not stop running.
760-029
When the overload indicator light comes on and power
generation stops, proceed as follows:
1. Turn off any connected electric devices and stop
the engine.
2. Reduce the total wattage of connected electric
devices within the application range.
3. Check for blockages in the cooling air inlet and
around the control unit. If any blockages are found,
remove.
4. After checking, restart the engine.
NOTE:
9 The generator AC output automatically resets
when the engine is stopped and then restarted.
9 The overload indicator light may come on for a few
seconds at first when using electric devices that
require a large starting current, such as a com-
pressor or a submergible pump. However, this is
not a malfunction.
– 16 –
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AE00904
Battery Charging
cC
Do not use AC and DC power at the same time or
the generator may be damaged.
NOTE:
The generator DC rated voltage is 12V.
1. Wind the battery charging lead 2 or 3 turns around
the handle and plug into DC receptacle.
NOTE:
761-086a
9 Make connections to the battery after starting the
engine.
9 Clamp the red wire to the positive (+) terminal and
the black wire to the negative (-) terminal of the
battery. Do not reverse these positions.
2
1
1 Red
762-046
2 Black
2. Start the engine.
3. Press in the DC protector and install the battery.
cC
9 Be sure the battery leads are properly connect-
ed.
9 Be sure the breather hose is properly connect-
ed and is not damaged or obstructed.
9 Reduce the load to the specified generator
rated output if the DC protector turns off. If it
turns off again, consult a Yamaha dealer.
12v
762-047
w
q
NOTE:
Press to reset the DC protector.
763-238a
1 “ON”
2 “OFF”
NOTE:
9 At full charge, electrolyte specific gravity is
between 1.26 and 1.28.
9 Check specific gravity hourly.
– 17 –
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w
Never smoke or make and break connections at the
battery while charging. Sparks may ignite the bat-
tery gas.
Battery electrolyte is poisonous and dangerous,
causing severe burns, etc. contains sulfuric (sul-
phuric) acid. Avoid contact with skin, eyes or cloth-
ing.
Antidote:
EXTERNAL-Flush with water.
INTERNAL-Drink large quantities of water or milk.
Follow with milk of magnesia, beaten egg or veg-
etable oil. Call physician immediately.
EYES: Flush with water for 15 minutes and get
prompt medical attention. Batteries produce explo-
sive gases. Keep sparks, flame, cigarettes, etc.,
away. Ventilate when charging or using in closed
space. Always cover eyes when working near bat-
teries. KEEP OUT OF REACH OF CHILDREN.
762-012
– 18 –
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AE01173
STOPPING THE ENGINE
NOTE:
9 Turn off any electric devices.
761-085
1. Disconnect any electric devices.
2. Turn the engine switch to the “5” (STOP) position.
1
5
“STOP”
q
763-262
3. Turn the fuel cock lever to “OFF”.
2 “OFF”
2
705-075a
– 19 –
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AE00401
PERIODIC MAINTENANCE
AE00403
MAINTENANCE CHART
Regular maintenance is most important for best performance and safe operation.
w
Stop the engine before starting maintenance work.
Initial
Every
6
Pre-Ope-
ration
1
3
12
No.
1.
Item
Remarks
check
(daily)
month
months months months
or 20 Hr or 50 Hr or 100 Hr or 300 Hr
Check condition.
Adjust gap and
clean. Replace if
necessary.
0
**
Spark Plug
Check and adjust
when engine is
cold.
**
2.* Valve Clearance
**
0
Check breather
hose for cracks or
damage. Replace
if necessary.
Crankcase
breather system
3.*
0
0
Check and adjust
engine idle speed.
**
4.* Idle speed
Check for leakage.
Retighten or
*replace gasket
if necessary.
0
**
5. Exhaust System
Check muffler
screen and spark
arrester. Clean/
replace if
0
necessary.
Check oil level
Replace
0
6. Engine Oil
0
0
Clean.
Replace if
necessary.
**
7. Air Filter
0
*
: It is recommended that these items be serviced by a Yamaha dealer.
** : Related to emission control system.
– 20 –
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Initial
Every
6
Pre-Ope-
ration
1
3
12
No.
Item
Remarks
check
month
months months months
(daily)
or 20 Hr or 50 Hr or 100 Hr or 300 Hr
Clean fuel tank
filter. Replace if
necessary.
8. Fuel Filter
9. Fuel Line
0
Check fuel hose
for crack or da-
mage. *Replace
if necessary.
0
0
Check choke
operation.
**
10. Choke knob
Check for fan
damage.
11. Cooling System
12. Starting System
0
0
Check recoil
starter operation.
0
0
**
More frequently
if necessary.
13.* Decarbonization
Check the pilot
light comes on.
14. Generation
Check all fittings
and fasteners.
Correct if
Fittings/
15.*
0
Fasteners
necessary.
*
: It is recommended that these items be serviced by a Yamaha dealer.
** : Related to emission control system.
cC
Use only Yamaha specified genuine parts for replacement. Ask an authorized
Yamaha dealer for further attention.
– 21 –
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AE01051
SPARK PLUG INSPECTION
You should periodically remove and inspect the spark
plug.
2
1. Loosen the bolt 1 and remove the side cover 2.
2. Remove the spark plug cap and the spark plug.
3. Check for discoloration and remove the carbon.
1
1
788-014
Standard electrode color:
Tan Color
4. Check the spark plug type and gap.
Standard Spark Plug:
BPR4ES (NGK)
760-031
Spark Plug Gap:
0.7–0.8 mm (0.028–0.031 in)
a Gap
a
5. Install the spark plug.
760-001a
Spark Plug Torque:
17.5 N•m (1.75 kgf•m, 13 lbf•ft)
6. Install the spark plug cap.
7. Install the side cover and tighten the bolt.
AE00431
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.
– 22 –
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AE01174
ENGINE OIL REPLACEMENT
1. Place the machine on a level surface and warm up
the engine for several minutes.
Then stop the engine.
2. Remove the rubber cap 1 on the bottom.
1
700-130
3. Place an oil pan under the engine . Remove the
drain bolt 2.
5
2
700-132
4. Open the oil filler cover 3 as shown and remove
the oil filler cap 4 so that the oil can be complete-
ly drained.
5. Check the drain bolt , gasket 5, oil filler cap and O-
3
ring 6.
If damaged, replace.
4
6
3
700-133
6. Reinstall the oil drain bolt.
Drain Bolt Torque:
q
17 N•m (1.7 kgf•m, 12 lbf•ft)
7. Add engine oil to the upper level.
1Upper level
700-006a
– 23 –
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Recommended oil:
0°C
25°C
å
YAMALUBE 4 (10W-30) or SAE 10W-30
A YAMALUBE 4(10W-30)
type SE motor oil
SAE #30
∫
ç
∂
D SAE 10W
C SAE #20
B SAE #30
SAE #20
SAE 10W
Engine oil quantity:
32°F
80°F
700-065
0.6 L (0.53 Imp qt, 0.63 US qt)
NOTE:
Recommended engine oil classification:
API Service “SE” or “SF”.
cC
Be sure no foreign material enters the crankcase.
8. Install the oil filler cap.
9. Install the rubber cap on the bottom.
cC
Be sure to install securely to prevent from falling
off during operation.
10. Close the oil filler cover.
AE01028
MUFFLER SCREEN AND SPARK ARRESTER
w
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.
741-123
1. Remove the cover 1
1
788-016
2. Remove the muffler screen.
2 Muffler screen
3 Screw
3
2
711-077
– 24 –
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3. Use a flathead screw driver to pry the spark
arrester out from the muffler.
711-078
4. Remove the spark arrester.
q
1 Spark arrester
711-079
5. Remove the carbon deposits on the muffler screen
and spark arrester using a wire brush.
cC
When cleaning, use the wire brush lightly to avoid
damaging or scratching of the muffler screen and
spark arrester.
711-075
6. Check the muffler screen and spark arrester.
Replace them if damaged.
7. Install the spark arrester.
NOTE:
w
q
Align the spark arrester projection with the hole in the
muffler pipe.
711-080
1 Projection
2 Hole
8. Install the muffler screen.
711-081
9. Install the cover.
788-016a
– 25 –
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E01175
AIR FILTER
1. Loosen the bolt 1 and remove the cover 2.
1
2
1
788-017
2. Remove the air filter cover and element.
3. Wash the foam element in solvent and dry.
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
SAE #20 motor oil
cC
Do not wring out the element.
This could cause it to tear.
5. Insert the element into the air filter.
NOTE:
Be sure the element sealing surface matches the air fil-
ter so there is no air leak.
cC
The engine should never run without the element;
excessive piston and cylinder wear may result.
w
Never use solvent while smoking or in the vicinity
of an open flame.
710-037a
6. Install the air filter cover.
7. Install the cover and tighten the bolt.
– 26 –
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AE00471
FUEL TANK FILTER
1. Remove the fuel tank cap and filter.
q
1 Filter
2. Clean the filter with solvent. If damaged, replace.
3. Wipe the filter and insert it.
w
Be sure the tank cap is tightened securely.
707-108
– 27 –
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AE01176
TROUBLESHOOTING
Engine won’t start
1. Fuel systems
No fuel supplied to combustion chamber.
2 No fuel in tank .... Supply fuel.
707-106
2 Fuel in tank .... Fuel cock lever to “ON”.
2 Clogged fuel line .... Clean fuel line.
2 Clogged carburetor .... Clean carburetor.
705-075b
2. Engine oil system
Insufficient
2 Oil level is low .... Add engine oil.
700-006
3. Electrical systems
2 Engine switch to “ON”.
Poor spark
2 Spark plug dirty with carbon or wet .... Remove car-
bon or wipe spark plug dry.
2 Faulty ignition system .... Consult dealer.
763-261a
4. Compression
Insufficient
2 Worn out piston and cylinder .... Consult dealer.
2 Loose cylinder head nuts .... Tighten nuts properly.
2 Damaged gasket .... Replace gasket.
760-009
AE00785
Generator won’t produce power
2 Safety device (AC) to “OFF” .... Stop the engine,
then restart.
2 Safety device (DC protector) to “OFF” .... Press to
reset the DC protector.
– 28 –
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AE00515
A
ENGINE DOES NOT START
B
Turn the engine switch to “ON”, then pull
the recoil starter and check if the oil
warining light flickers.
E
F
Check engine oil level.
OK
G
Level low
C
H
Does not flicker
D
Flickers.
Consult a
Yamaha dealer.
Add engine oil.
Pull the recoil starter and check the
spark plug for spark strength.
(See “WARNING”)
K
Check the spark plug.
9 Type:
9 Gap:
L
Incorrect
M
OK
w
9 To prevent FIRE HAZARDS be
sure fuel is not present in the
spark plug area.
Replace or
Adjust Gap.
Clean the spark
plug.
9 To prevent FIRE HAZARDS be
sure to place the spark plug as far
way 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
Engine does not
start.
J
Engine starts.
N
Q
Check the following
Clean or Replace; Consult
Yamaha dealer.
a
O
P
Clogged
OK
9 Fuel line clogging
9 Air cleaner element
clogging.
R
Consult a Yamaha dealer.
– 29 –
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AE00601
STORAGE
Long term storage of your machine will require some
preventive procedures to guard against deterioration.
AE01177
DRAIN THE FUEL
1. Remove the fuel tank cap. Drain the fuel from the
fuel tank into an approved gasoline container using
a commercially available hand siphon. Then, install
the fuel tank cap.
w
9 Fuel is highly flammable and poisonous. Check
“SAFETY INFORMATION” (See page 5) careful-
ly.
9 Wipe up any spilled fuel immediately.
2. Drain fuel from the carburetor by loosening the
drain screw 1 on the carburetor float chamber.
3. Turn the fuel cock lever to “OFF”. Start the engine
and leave it run until it stops.
1
707-109
This will burn any remaining fuel in the carburetor.
AE00621
ENGINE
1. Remove the spark plug, pour about one table-
spoon of SAE 10W30 or 20W40 motor oil 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 generator and apply a rust
inhibitor.
4. Store the generator in a dry, well-ventilated place,
with the cover placed over it.
5. The generator must remain in a vertical position
when stored, carried or operated.
712-030
– 30 –
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AE00789
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 OFF-
ROAD ENGINES.
The acronyms conform to the latest version of the SAE’s recommended practice docu-
ment J1930, “Diagnostic Acronyms, Terms, and Definitions For Electrical/Electronic
System”.
It is recommended that these items be serviced by a Yamaha dealer.
– 31 –
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AE00701
SPECIFICATIONS
AE00702
DIMENSIONS
Unit
EF2400iS
527 (20.7)
419 (16.5)
461 (18.1)
32 (72)
Overall Length
Overall Width
Overall Height
Dry Weight
mm (in)
mm (in)
mm (in)
kg (lb)
AE00704
ENGINE
EF2400iS
Unit
Type
Forced air cooled 4-stroke gasoline OHV
Cylinder Arrangement
Displacement
Inclined, 1 cylinder
171
cm3
mm (in)
kW(HP)/r/min
Hr
Bore × Stroke
Rated Output
66.0 × 50.0 (2.60 × 1.97)
2.5 (3.4)/3,200
8.6
Operation Hours at rated operation
Fuel
Unleaded gasoline
6.0 (1.32, 1.59)
0.6 (0.53, 0.63)
TCI
Fuel Tank Capacity
Engine Oil Quantity
Ignition System
L (Imp gal, US gal)
L (Imp qt, US qt)
Spark Plug: Type
Spark Plug: Gap
BPR4ES (NGK)
0.7–0.8 (0.028–0.031)
mm (in)
dB (A)
Noise Level*
59
: Measured at rated operation from 7 m (23 ft) distance.
*
AE00707
GENERATOR
EF2400iS
Unit
AC Output
Rated Voltage
Rated frequency
Rated current
Rated Output
Safty Device: Type
V
Hz
A
120
60
16.7
kVA
2.0
Electronic
DC Output
Rated voltage
Rated current
Safety Device: Type
V
A
12
8
DC protector
– 32 –
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AE00751
WIRING DIAGRAM
q
Y
Y
Y
W
W
W
Y
Y
Y
Br
R
Br
R
R
Br
G/Y
r
L
Br
R
Br
R
Br
R
w
e
W
W
W
W
O
O
L
L
O
O
O
O
L
i
B
y
u
t
R
O
Y
G
L
BW
G
Y
R
L
G
Y
R
G/Y
@
L
o
O
O
G/Y
B/W
Y
B/W
Y
!
Y
B/W
W
!
B
B
G/Y
B/W
O
B/W
O
B/W B/W
!
O
O
!
L
L
L
B/W
O
G/Y
O
G/Y
O
!
!
Y
!
G/Y
!
!
L
Y
B/W
!
Y
770-054
Color code
1 Main coil
2 DC coil
3 Sub coil
4 DC rectifier
5 Control unit
p Stepping motor
B
Black
Brown
Green
Blue
Br
G
L
O
R
W
Y
Orange
Red
White
Yellow
6 AC pilot light
7 Parallel terminal
8 AC receptacle
9 Ground (Earth) terminal
0 Overload indicator light
q DC receptacle
B/W Black/White
G/Y Green/Yellow
w DC protector (breaker)
e Engine switch
r Oil warning light
t Speed limiter assembly
y Oil level gauge
u T.C.I. magneto
i T.C.I. unit
o Spark plug
– 33 –
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PRINTED IN JAPAN
!
05 9 02 – 0.4 × 1
PRINTED ON RECYCLED PAPER
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