
Generator
LIT-19626-01-15 7WV-28199-11
EF4000DE
EF5200DE
EF6600DE
YG4000D
YG5200D
YG6600D
YG6600DE
OWNER’S MANUAL


AE00012
IDENTIFICATION NUMBER RECORDS
Record your Primary I.D., and serial num-
bers 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.
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 a Yamaha deal-
er.
AE00002
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.
PRI-I.D. NUMBER:
PRI-I.D.
CODE SERIAL No.
EF4000DE/EF5200DE/EF6600DE
YG4000D/YG5200D/YG6600D/YG6600DE
OWNER’S MANUAL
© 2003 by Yamaha Motor Corporation, U.S.A.
1st Edition, August 2003
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-19626-01-15
MODEL
AE00022
790-060

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 manu-
al, please consult a Yamaha dealer.
9 This manual should be considered a
permanent part of this engine and
should remain with this engine when
resold.
AE00032
w
PLEASE READ AND UNDERSTAND
THIS MANUAL COMPLETELY BEFORE
OPERATING THE MACHINE.
Particularly important information is distin-
guished in this manual by the following
notations.
-
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.

AE00041
CONTENTS
LIMITED WARRANTY (EF- AND
EDL-SERIES) ........................................1
LIMITED WARRANTY (EC- AND
YG-SERIES) ..........................................2
LOCATION OF IMPORTANT LABELS.4
SAFETY INFORMATION.......................6
EXHAUST FUMES ARE
POISONOUS ......................................6
FUEL IS HIGHLY FLAMMABLE AND
POISONOUS ......................................6
ENGINE AND MUFFLER MAY
BE HOT ..............................................6
ELECTRIC SHOCK PREVENTION ....7
CONNECTION NOTES ......................8
CONNECTION....................................8
EXTENSION CORD NOTES ..............8
CONTROL FUNCTION ..........................9
DESCRIPTION ...................................9
CONTROL BOX................................11
OIL WARNING SYSTEM ..................13
ENGINE SWITCH .............................13
STARTER SWITCH ..........................13
AC SWITCH (N.F.B.) ........................14
ECONOMY IDLE SWITCH ...............14
VOLTAGE ADJUSTER .....................15
G.F.C.I. RECEPTACLE ....................15
PRE-OPERATION CHECK .................16
FUEL.................................................16
ENGINE OIL .....................................17
GROUND (Earth) ..............................18
BATTERY .........................................18
OPERATION ........................................19
STARTING THE ENGINE.................19
APPLICATION RANGE ....................21
CONNECTION..................................22
STOPPING THE ENGINE ................24
PERIODIC MAINTENANCE ................25
MAINTENANCE CHART ..................25
SPARK PLUG INSPECTION ............27
CARBURETOR ADJUSTMENT .......27
ENGINE OIL REPLACEMENT .........28
AIR FILTER ......................................29
FUEL COCK .....................................30
FUEL TANK FILTER.........................30
MUFFLER SCREEN AND SPARK
ARRESTER ......................................31
BATTERY .........................................34
FUSE REPLACEMENT ....................35
G.F.C.I. RECEPTACLE TEST ..........35
TROUBLESHOOTING......................36
STORAGE ...........................................40
DRAIN THE FUEL ............................40
ENGINE ............................................40
BATTERY .........................................41
EXHAUST EMISSION CONTROL
SYSTEM AND COMPONENTS ...........42
SPECIFICATIONS ...............................43
DIMENSIONS ...................................43
ENGINE ............................................43
GENERATOR ...................................43
WIRING DIAGRAM
EF4000DE ........................................44
EF5200DE ........................................45
EF6600DE ........................................46
YG4000D ..........................................47
YG5200D ..........................................48
YG6600D ..........................................49
YG6600DE........................................50
BATTERY TRAY INSTALLATION ......51
ENGINE HANGER INSTALLATION ...51
OPTIONAL PARTS INSTALLATION ..51

– 1 –
Yamaha Motor Corporation, U.S.A. hereby war-
rants that new Yamaha consumer generators pur-
chased from an authorized Yamaha consumer
generator dealer in the continental United States
will be free from defects in material and workman-
ship for the period of time stated herein, subject to
certain stated limitations.
THE PERIOD OF WARRANTY Any new EF-
series or EDL-series Yamaha Generator pur-
chased for private, non-commercial use from an
authorized Yamaha consumer generator dealer in
the continental United States will
be warranted against defects in material or work-
manship for a period two (2) years from date of
purchase, 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.
DURING THE PERIOD OF WARRANTY any
authorized Yamaha 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 war-
ranted for the balance of the product’s warranty
period. All parts replaced under warranty become
property of Yamaha Motor Corporation U.S.A.
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.
SPECIFIC EXCLUSIONS from this warranty shall
include parts replaced due to normal wear or rou-
tine maintenance.
THE CUSTOMER’S RESPONSIBILITY under this
warranty shall be to:
1. Operate and maintain the generator as speci-
fied in the appropriate Owner’s Manual;
2. Give notice to an authorized Yamaha con-
sumer generator dealer of any and all appar-
ent defects within ten (10) days after discov-
ery, and make the unit available at that time
for inspection and repairs at such dealer’s
place of business.
WARRANTY TRANSFER: To transfer the warran-
ty from the original purchaser to any subsequent
purchaser(s), it is imperative that the unit be
inspected and registered for warranty by an autho-
rized 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 warranty be extended beyond the original peri-
od.
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.
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
DAMAGES INCLUDING LOSS OF USE. SOME
STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES, SO THE ABOVE EXCLUSION
MAY NOT APPLY TO YOU.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS, AND YOU MAY ALSO HAVE OTHER
RIGHTS WHICH VARY FROM STATE TO STATE.
YAMAHA MOTOR CORPORATION, U.S.A.
Post Office Box 6555
Cypress, California 90630
AE01119
YAMAHA MOTOR CORPORATION U.S.A.
EF- AND EDL-SERIES GENERATOR LIMITED WARRANTY

– 2 –
Yamaha Motor Corporation, U.S.A. hereby war-
rants that new Yamaha EC- and YG-series gener-
ators purchased from an authorized Yamaha
industrial 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 stated limitations.
THE PERIOD OF WARRANTY for Yamaha EC-
series and YG-series generators shall be one (1)
year from the date of purchase.
DURING THE PERIOD OF WARRANTY any
authorized Yamaha industrial 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 war-
ranted for the balance of the product’s warranty
period. All parts replaced under warranty become
property of Yamaha Motor Corporation U.S.A.
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.
SPECIFIC EXCLUSIONS from this warranty shall
include parts replaced due to normal wear or rou-
tine maintenance.
THE CUSTOMER’S RESPONSIBILITY under this
warranty shall be to:
1. Operate and maintain the diesel generator as
specified in the appropriate Owner’s Manual;
2. Give notice to an authorized Yamaha industri-
al 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 warran-
ty from the original purchaser to any subsequent
purchaser(s), it is imperative that the unit be
inspected and registered for warranty by an autho-
rized Yamaha industrial 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 warranty be extended beyond the original peri-
od.
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.
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
DAMAGES INCLUDING LOSS OF USE. SOME
STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF INCIDENTAL OR CONSEQUEN-
TIAL DAMAGES, SO THE ABOVE EXCLUSION
MAY NOT APPLY TO YOU.
THIS WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS, AND YOU MAY ALSO HAVE OTHER
RIGHTS WHICH VARY FROM STATE TO STATE.
YAMAHA MOTOR CORPORATION, U.S.A.
Post Office Box 6555
Cypress, California 90630
YAMAHA MOTOR CORPORATION U.S.A.
EC- AND YG-SERIES INDUSTRIAL GENERATOR LIMITED WARRANTY

– 3 –
Q. What costs are my responsibility during the
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.
Q. What are some examples of “abnormal” strain,
neglect, or abuse?
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
specific questions on operation or mainte-
nance, please contact your dealer for advice.
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.
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.
Q. Will the warranty be void or cancelled if I do
not operate or maintain my new Yamaha
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.
2. Explain the operation, maintenance, and
warranty requirements to your satisfaction
at the time of sale, and upon your request
at any later date.
In addition, each Yamaha generator dealer is
held responsible for his setup, service and
warranty repair work.
Q. Is the warranty transferable to second own-
ers?
A. Yes. The remainder of the existing warranty
can be transfered upon request.The unit has
to be inspected and reregistered by an autho-
rized Yamaha generator dealer for the policy
to remain effective.
CUSTOMER SERVICE
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 identifica-
tion or other valid proof of the original date of pur-
chase. If a question or problem arises regarding
warranty, first contact the owner of the dealership.
Since all warranty matters are handled at the deal-
er level, this person is in the best position to help
you. If you are still not satisfied and require addi-
tional assistance, please write:
YAMAHA MOTOR CORPORATION U.S.A. CUS-
TOMER RELATIONS DEPARTMENT
P.O. BOX 6555
Cypress, California 90630
CHANGE OF ADDRESS
The federal government requires each manufac-
turer to maintain a complete, up-to-date list of all
first purchasers against the possibility of a safety-
related 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 post-
card 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:
YAMAHA MOTOR CORPORATION, U.S.A.
WARRANTY DEPARTMENT
P.O. Box 6555
Cypress, California 90630
This will ensure that Yamaha Motor Corporation,
U.S.A. has an up-to-date registration record in
accordance with federal law.
WARRANTY QUESTIONS AND ANSWERS

– 4 –
AE00062
LOCATION OF IMPORTANT LABELS
(For EF4000DE/YG4000D)
Please read the following labels carefully before oper-
ating this machine.
NOTE:
Maintain or replace safety and instruction labels, as
necessary.
1 2
r w t q e y
r w t q y
WARNING
Electrocution Or property damage
can occur: Do not connect this
generator to any building ’s electrical
system unless an isolation switch
has been installed by a licensed elec-
trician. Refer to the owner’s manual.
HOT EXHAUST
3
WARNING
HOT AREA
DO NOT TOUCH
IMPORTANT ENGINE INFORMATION
ENGINE FAMILY : zzzzzzzzzzzz
E M
REFER TO OWNER'S MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
THIS ENGINE MEETS zzzz-zzzz CALIFORNIA EMISSION REGULATIONS FOR SMALL OFF-ROAD ENGINES.
THIS ENGINE CONFORMS TO PHASE 2 U.S.EPA REGULATIONS FOR SMALL NONROAD ENGINES.
YAMAHA MOTOR CO. LTD zzz-2179R-zz
DISPLACEMENT: VALVE LASH (A)
rpm
NO OTHER ADJUSTMENTS NEEDED.
ENGINE OIL:
IDLE SPEED:
FUEL: THIS ENGINE IS CERTIFIED TO OPERATE ON UNLEADED GASOLINE.
IGNITION TIMING & IDLE MIXTURE
zzzJ IN:
TYPE
z.zz~z.zz EX: z.zz~z.zz
zzzz~zzzz AT NO LOAD
SE SAE 10W-30
EMISSIONS COMPLIANCE PERIOD:CATEGORY A (EPA)
WARNING
READ THE OWNER‘S MANUAL AND ALL LABELS BEFORE OPERATING.
q q
AVERTISSEMENT
8
ONLY OPERATE IN WELL-VENTILATED AREA.
EXHAUST GAS CONTAINS POISONOUS CARBON MONOXIDE.
CHECK FOR SPILLED FUEL OR FUEL LEAKS.
STOP ENGINE BEFORE REFUELING.
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.
8
8
8
8
8
MACHINE AU SEC EN TOUTES CIRCONSTANCES.
7NJ-24162-10
8
8
8
8
8
8
LISEZ LE MODE D‘EMPLOI ET TOUTES LES ETIQUETTES AVANT DE
FAIRE FONCTIONNER LA MACHINE.
FAITES FONCTIONNER UNIQUEMENT DANS DES LIEUX BIEN AERES.
LES GAZ D‘ECHAPPEMENT CONTIENNENT DU MONOXYDE DE CARBONE.
VERIFIEZ SI DU CARBURANT A ETE RENVERSE DU S‘IL FUIT.
ARRETEZ LE MOTEUR AVANT DE FAIRE LE PLEIN DE CARBURANT.
N‘UTILISEZ PAS A PROXIMITE DE MATERIAUX INFLAMMABLES.
IL Y A RISQUE D‘ELECTROCUTION SI LE GENERATEUR FONCTIONNE
SOUS LA PLUIE, DANS LA NEIGE, OU PRES DE L‘EAU. GARDEZ LA
MACHINE AU SEC EN TOUTES CIRCONSTANCES.
4
5
0 2 4 6 8 10
ENGINE AIR INDEX
(
California onl
y
)
LEAST CLEAN
MOST CLEAN
NOTE
:
THE LOWER THE AIR INDEX, THE LESS THE POLLUTION
FOR THE FOLLOWING USE:
THIS ENGINE IS CERTIFIED TO BE EMISSION COMPLIANT
MODERATE
INTERMEDIATE
EXTENDED
CHECK OWNERS MANUAL FOR FURTHER DETAILS
THIS LABEL TO BE REMOVED BY THE ULTIMATE PURCHASER ONLY!
6

– 5 –
(For EF5200DE/EF6600DE/YG5200D/
YG6600D/YG6600DE)
1 2
qe r
t
792-027a
q e w t
792-028b
WARNING
Electrocution Or property damage
can occur: Do not connect this
generator to any building ’s electrical
system unless an isolation switch
has been installed by a licensed elec-
trician. Refer to the owner’s manual.
HOT EXHAUST
IMPORTANT ENGINE INFORMATION
ENGINE FAMILY : zzzzzzzzzzzz
E M
REFER TO OWNER'S MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
THIS ENGINE MEETS zzzz-zzzz CALIFORNIA EMISSION REGULATIONS FOR SMALL OFF-ROAD ENGINES.
THIS ENGINE CONFORMS TO PHASE 2 U.S.EPA REGULATIONS FOR SMALL NONROAD ENGINES.
YAMAHA MOTOR CO. LTD zzz-2179R-zz
DISPLACEMENT: VALVE LASH (A)
rpm
NO OTHER ADJUSTMENTS NEEDED.
ENGINE OIL:
IDLE SPEED:
FUEL: THIS ENGINE IS CERTIFIED TO OPERATE ON UNLEADED GASOLINE.
IGNITION TIMING & IDLE MIXTURE
zzzJ IN:
TYPE
z.zz~z.zz EX: z.zz~z.zz
zzzz~zzzz AT NO LOAD
SE SAE 10W-30
EMISSIONS COMPLIANCE PERIOD:CATEGORY A (EPA)
WARNING
READ THE OWNER‘S MANUAL AND ALL LABELS BEFORE OPERATING.
q q
AVERTISSEMENT
8
ONLY OPERATE IN WELL-VENTILATED AREA.
EXHAUST GAS CONTAINS POISONOUS CARBON MONOXIDE.
CHECK FOR SPILLED FUEL OR FUEL LEAKS.
STOP ENGINE BEFORE REFUELING.
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.
8
8
8
8
8
MACHINE AU SEC EN TOUTES CIRCONSTANCES.
7NJ-24162-10
8
8
8
8
8
8
LISEZ LE MODE D‘EMPLOI ET TOUTES LES ETIQUETTES AVANT DE
FAIRE FONCTIONNER LA MACHINE.
FAITES FONCTIONNER UNIQUEMENT DANS DES LIEUX BIEN AERES.
LES GAZ D‘ECHAPPEMENT CONTIENNENT DU MONOXYDE DE CARBONE.
VERIFIEZ SI DU CARBURANT A ETE RENVERSE DU S‘IL FUIT.
ARRETEZ LE MOTEUR AVANT DE FAIRE LE PLEIN DE CARBURANT.
N‘UTILISEZ PAS A PROXIMITE DE MATERIAUX INFLAMMABLES.
IL Y A RISQUE D‘ELECTROCUTION SI LE GENERATEUR FONCTIONNE
SOUS LA PLUIE, DANS LA NEIGE, OU PRES DE L‘EAU. GARDEZ LA
MACHINE AU SEC EN TOUTES CIRCONSTANCES.
3
4
0 2 4 6 8 10
ENGINE AIR INDEX
(
California onl
y
)
LEAST CLEAN
MOST CLEAN
NOTE
:
THE LOWER THE AIR INDEX, THE LESS THE POLLUTION
FOR THE FOLLOWING USE:
THIS ENGINE IS CERTIFIED TO BE EMISSION COMPLIANT
MODERATE
INTERMEDIATE
EXTENDED
CHECK OWNERS MANUAL FOR FURTHER DETAILS
THIS LABEL TO BE REMOVED BY THE ULTIMATE PURCHASER ONLY!
5
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