Yamaha Ef2000is 2 Manual

– 36–
7DK-091
1
7DK-035
1
7DK-038
700-006
AE00512
TROUBLESHOOTING
Engine won’t start
1. Fuel systems
No fuel supplied to combustion chamber.
2No fuel in tank .... Supply fuel.
2Fuel in tank .... Fuel tank cap air vent knob and fuel
cock knob to “ON”1.
2Clogged fuel line .... Clean fuel line.
2Clogged carburetor .... Clean carburetor.
2. Engine oil system
Insufficient
2Oil level is low .... Add engine oil.
 7DK-9-11_a  11.3.21 15:19  Page 36 

– 37–
AE00515
Generator won’t produce power
2Safety device (DC protector) to “OFF”2···· Press
the DC protector to “ON”1.
2Safety device (AC) to “OFF”.... Stop the engine,
then restart.
1
27DK-052
7DK-041
791-001d
3. Electrical systems
2Engine switch to “ON”1and pull the recoil starter.
Poor spark
2Spark plug dirty with carbon or wet .... Remove car-
bon or wipe spark plug dry.
2Faulty ignition system .... Consult a Yamaha dealer.
17DK-039
 7DK-9-11_a  11.3.21 15:19  Page 37 

– 38–
B
POK
O Clogged C Does not flicker D Flickers.
AE00515
A ENGINE DOES NOT START
Turn the engine switch to “ON”, then pull
the recoil starter and check if the oil
warning light flickers.
HPull the recoil starter and check the
spark plug for spark strength.
(See “WARNING”)
w
9To prevent FIRE HAZARDS be
sure fuel is not present in the
spark plug area.
9To prevent FIRE HAZARDS be
sure to place the spark plug as far
away as possible from the spark
plug hole and carburetor area.
9To prevent ELECTRIC SHOCK...

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Unit EF2000iS
Type Air cooled 4-stroke gasoline OHV
Cylinder ArrangementInclined, 1 cylinder
Displacement cm379
Bore ×Stroke mm (in) 48.6 ×43.0 (1.91 ×1.69)
Operation Hours Hr 4.2–10.5 (rated load–1/4 load)
Fuel Unleaded gasoline
Fuel Tank Capacity L (US gal, Imp gal) 4.2 (1.11, 0.92)
Engine Oil Quantity L (US qt, Imp qt) 0.4 (0.42, 0.35)
Ignition System CDI
Spark Plug: Type BPR6HS (NGK)
Gap mm (in) 0.6–0.7 (0.024–0.028)
Noise Level*
dB / L
WA87.5
dB (A) / 7 m51.5–61
AE00701
SPECIFICATIONS
AE00702...

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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. PRI-I.D. NUMBER:
PRI-I.D.
CODESERIAL No. MODEL
7DK-0737DK-24163-00Serial NO.7DK-
CONSUMER INFORMATION
AE00011
Machine identification
The machine serial number is stamped in
the location as shown.
TIP
The first three digits of these numbers...

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AE00789
EXHAUST EMISSION CONTROL SYSTEM AND 
COMPONENTS
Item Acronym
9CARB. ASSY., LH. & JT., .......................CARB (Carburetor)
CARBURETOR2
9T.C.I. MAGNETO ASSY. &  .....................EI (Electronic Ignition)
PLUG, SPARK
9CRANKCASE1 & HEAD, .......................PCV (Positive Crankcase
CYLINDER1 Ventilation)
9AIR FILTER ASSY. . ................................ACL (Air Cleaner)
9MUFF., 2, CAP, NET, WIRE2 & 
ARRESTER, SPARK
The above items and the corresponding acronyms are provided in...

– 42–
W
BrR RBr
RBr
R
Br
RBrR Br
Br
B
B
B
B
BBB
B
B
B
Y Y
O
O O
Y Y Y Y
Y YY
Y
Y
Y R
RR
R R
L L
L
L
L
L
L L
L G
G
Y
Y
O
OO
O O O L
O
O
B/W
B/W
R/WBr
Br BrR/W R/W R/WG/Y
G/Y
O
G/Y
2 1
3
u
oi
p456
7
8
9
q 0
e w
r yt
7DK-10
AE00751
WIRING DIAGRAM
1Sub coil
2DC coil
3Main coil
4DC rectifier
5DC protector (breaker)
6Twin Tech (parallel 
running terminal)
7DC receptacle
8AC pilot light
9AC receptacle
0Economy control switch
qOverload indicator light
wEngine switch
eOil warning light
rGround (earth) terminal...

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YAMAHA MOTOR CORPORATION, U.S.A. 
EF SERIES GENERATORS 
3-YEAR LIMITED WARRANTY
Yamaha Motor Corporation, U.S.A. hereby war-
rants that new Yamaha generators purchased
from an authorized Yamaha generator dealer in
the United States will be free from defects in mate-
rial and workmanship for the period of time stated
herein, subject to certain stated limitations.
THE PERIOD OF WARRANTYAny new EF-
series Yamaha generator purchased from an
authorized Yamaha generator dealer in the United
States will...

– 44 –
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
 7DK-9-11_b  11.4.19 10:08  Page 44 

– 45 –
WARRANTY QUESTIONS AND ANSWERS
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 authorized 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-...