Yamaha Ef2000is 2 Manual

– 26–
4. Check for discoloration and remove the carbon.
The porcelain insulator around the center elec-
trode of spark plug should be a medium-to-light tan
color.
5. Check the spark plug type and gap a.
TIP
The spark plug gap should be measured with a wire
thickness gauge and, if necessary, adjusted to specifi-
cation.
2. Remove the spark plug cap 3and cap 4, and
insert the tool 5through the hole from the outside
of the cover.4
3
7DK-053
56
7DK-054
a
760-001a
Spark plug inspection
The spark plug is an...

– 27–
6. Install the spark plug.
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.
7. Install the spark plug cap and cap.
8. Install the cover and tighten the screws.
AE00431
Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting
should be left to a Yamaha dealer with the professional
knowledge,...

– 28–
4. Place an oil pan under the engine. Tilt the genera-
tor to drain the oil completely.
5. Place the generator on a level surface.
Do not tilt the generator when adding engine oil.
This could result in overfilling and damage to the
engine.
NOTICE
7DK-055
7DK-033
6. Add engine oil to the upper level 1.
Recommended engine oil:
åYAMALUBE 4 (10W-40), 
SAE 10W-30 or 10W-40
∫SAE #30çSAE #20∂SAE 10W
Recommended engine oil grade:
API Service SE type or higher
Engine oil quantity:
0.4 L (0.42 US qt, 0.35...

– 29–
AE01084
Air filter
1. Remove the screws 1, and then remove the cover
2.
2. Remove the screw 1and then remove the air filter
case cover 2.1
2
7DK-030
127DK-061
3. Remove the foam element 1.
4. Wash the foam element in solvent and dry it.
5. Oil the foam element and squeeze out excess oil.
The foam element should be wet but not dripping.
Do not wring out the foam element when squeezing
it. This could cause it to tear.
6. Insert the foam element into the air filter case.
TIP
Be sure the foam element...

– 30–
7DK-026
1 2
1
7DK-066
1237DK-063
7DK-064
4
7DK-065
AE01075
Muffler screen and spark arrester
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.
WARNING
2. Loosen the bolt 1and then remove the muffler cap
2, the muffler screen 3and spark arrester 4. 1. Remove the screws 1, and then pull the cover 2
outward.
 7DK-9-11_a  11.3.21 15:19  Page 30 

– 31–
2
1
7DK-065a
7DK-068
6. Install the muffler screen and the muffler cap, and
then tighten the bolt.
7. Install the cover and tighten the screws. 3. Remove the carbon deposits on the muffler screen
and spark arrester using a wire brush.
When cleaning, use the wire brush lightly to avoid
damaging or scratching of the muffler screen and
spark arrester.
4. Check the muffler screen and spark arrester.
Replace them if damaged.
5. Install the spark arrester.
TIP
Align the spark arrester lump 1with the hole...

– 32–
7DK-069
1
AE00471
Fuel tank filter
Never use the gasoline while smoking or in the
vicinity of an open flame.
1. Remove the fuel tank cap and filter 1.
2. Clean the filter with gasoline.
Replace it if damaged.
3. Wipe the filter and install it.
4. Install the fuel tank cap.
Be sure the fuel tank cap is tightened securely.
WARNING
WARNING
 7DK-9-11_a  11.3.21 15:19  Page 32 

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AE00601
STORAGE
Long term storage of your machine will require some
preventive procedures to guard against deterioration.
1
7DK-044
17DK-039
1
7DK-035
AE01056
Drain the fuel
1. Turn the engine switch to “STOP”1.
2. Remove the fuel tank cap. Extract the fuel from the
fuel tank into an approved gasoline container using
a commercially available handsiphon. Then, install
the fuel tank cap.
Fuel is highly flammable and poisonous. Check
“SAFETY INFORMATION”(See page 2) carefully.
Immediately wipe off...

– 34–
6. Remove the screws 1, and then remove the cover
2.
7. Drain the fuel from the carburetor by loosening the
drain screw 3on the carburetor float chamber.
8. Turn the engine switch to “OFF”.
9. Turn the fuel cock knob to “OFF”.
10. Tighten the drain screw 3.
11. Install the cover and tighten the screws.
12. Turn the fuel tank cap air vent knob to “OFF”.
1
2
7DK-030
3
7DK-071
13. Tighten further if any screws, bolts and nuts are
loose.
14. Store the generator in a dry, well-ventilated place,
with the...

– 35–
Engine
Perform the following steps to protect the cylinder, pis-
ton ring, etc. from corrosion.
1. Remove the spark plug, pour about one table-
spoon of SAE 10W-30 or 20W-40 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...