Yamaha EF3000iSE - Inverter Generator - 3000 Maximum AC... User manual

YAMAHA GENERATOR
NEW MODEL GUIDE
EF3000iSE
EF3000iSEB
YAMAHA MOTOR CO., LTD
O.P.E. OPERATIONS
SERVICE GROUP
March 2003
318040
EF3000iSE new model guide 3/14/03 4:20 PM Page 0-1

CONTENTS
INVERTER SYSTEM
Benefits of an inverter generator EF3000iSE .......................................1
Multi-pole alternator features................................................................1
Control unit ...........................................................................................2
Inverter system of EF3000iSE ..............................................................2
Principles of power generation with an inverter generator...................2
Function of control unit ........................................................................3
Electronic governor ...............................................................................3
Function of electronic governor............................................................4
Throttle motor .......................................................................................4
Economy control operation and features ..............................................4
Continuous running time.......................................................................5
Frequency variation...............................................................................6
Voltage variation....................................................................................6
Instantaneous frequency fluctuation & instantaneous voltage drop .....6
Electronic breaker .................................................................................7
GENERATOR
Cooling system......................................................................................8
Control panel.........................................................................................9
Indicators...............................................................................................9
Overload warning lamp......................................................................9
Output indicator ...............................................................................10
Oil warning lamp .............................................................................10
Covers..................................................................................................10
DC 12 V output ...................................................................................11
Battery charging ..................................................................................12
ENGINE
Engine..................................................................................................16
Ignition system ....................................................................................16
Oil warning system .............................................................................17
Auto de-compressor system ................................................................17
TECHNICAL TIPS
Fuel tank removal................................................................................18
Engine oil replacement........................................................................19
Air cleaner & carburetor .....................................................................20
MF battery...........................................................................................21
APPENDIX
Special tools ........................................................................................22
Wiring diagram....................................................................................23
External views of the EF3000iSE .......................................................26
Serial number ......................................................................................26
Specifications ......................................................................................27
EF3000iSE new model guide 3/14/03 4:20 PM Page 0-2

Introduction
The EF3000iSE is the first Yamaha generator to use our exclusive inverter system (microcomputer-controlled
sine wave inverter) packed in a soundproof case, and designed in response to the diverse needs of the market
today.
With the adoption of the inverter system, it supplies high quality electricity equivalent to household power sup-
ply.
The EF3000iSE uses the same highly reputed and reliable MZ175 engine used on EF2600 for the USA and
EF2300 for Europe.
Air intake Fuel tank cap Fuel gauge
Recoil starter Control panel Service hatch Exhaust MF Battery Service hatch
Main switch Economy control switch DC output AC receptacles
Fuel pet cock Choke knob Oil warning lamp
Output indicator
Over load indicator
USA specification
    
EF3000iSE new model guide 3/14/03 4:20 PM Page 0-3

– 1 –
Benefits of an inverter generator EF3000iSE
The EF3000iSE realizes a new, high-level standard of quality that breaks the mold of the conventional gener-
ator image.
In terms of basic functions, the EF3000iSE achieves:
1. quiet, pleasant operating sound of 51dBA/7m at 1/4 rated load,
2. a continuous running time of 20.5 hours at 1/4 rated load,
3. sine wave AC supply (waveform distortion ratio of less than 2.5%)
4. controls concentrated on one panel.
5. a lightweight, compact body of just 64 kg and equipped with four wheels for easy moving,
In addition, the EF3000iSE is packed full of convenient design features throughout, such as large fuel tank
filling mouth, outstanding easy starting. The EF3000iSE is also a model that can be used for a wide range of
applications, even able to supply sine wave AC current to a UPS, Uninterruptible Power Supply.
Multi-pole alternator features
The combination of ferrite magnets in the rotor and
multi-pole stator provides compact and high perfor-
mance alternator.
High-frequency multi-pole alternator features:
16-pole rotor
24-pole stator coil
3-phase AC power generation
Reference information:
Ferrite magnets are magnetically stable and have a
strong coercive force and so do not become demagne-
tized. While they have excellent corrosion resistance,
they are also brittle due to the way they are produced.
Great care must be taken when assembling them as jar-
ring or shocks of force can adversely affect their effi-
ciency.
Exhaust pipe
Engine
Alternator
Muffler
Fuel tank
Control unit
Recoil starter
Battery
EF3000iSE/EF3000iSEB
EF3000iSE new model guide 3/14/03 4:20 PM Page 1

– 2 –
Control unit
The control unit is a sealed unit.
Functions:
AC power generation
Electronic governor (throttle control)
Economy control program
Self-protective function
Over current
Over voltage
High temperature
Inverter system of EF3000iSE
In the EF3000iSE, the control unit and multi-pole alternator cooperate to generate AC output. The inverter,
controlled by a 16-bit microcomputer, is a PWM sine wave inverter.
* PWM: Pulse Width Modulation
1. The generator’s output frequency remains unchanged even when the engine speed varies.
2. The output voltage is stable.
3. The output waveform is sine wave with distortion ratio of less than 2.5%, equivalent to household elec-
tricity.
Principles of power generation with an inverter portable generator
* An alternator that uses highly efficient ferrite magnets generates three-phase AC.
8120V model: AC 135 to 255V, 300 to 550Hz
8230V model: AC 260 to 488V, 300 to 550Hz
Control unit
*
EF3000iSE new model guide 3/14/03 4:20 PM Page 2

– 3 –
Power generation
Stage 1. The rectifier circuit converts three-phase AC into DC and it maintains stable DC voltage using a con-
stant voltage circuit
Stage 2. The Constant voltage DC current is stored in a condenser.
Stage 3. The PWM, pulse width modulator, inverter circuit generates a stable sine wave AC current.
Stage 4. The filter circuit further smoothen the sine wave of the AC current and reduce electrical noise.
Protective functions:
■Overload (over current) protection device
The control unit has similar function to conventional NFB. When the output current exceeds specified
amperage, AC output is interrupted within specified length of time.
■Overheat protection
When the internal temperature of the control unit becomes abnormally high, AC output is interrupted.
■Over-voltage protection device
AC output is interrupted when the excessive current flows into the generator from outside power source
causing to rise voltage in the control unit.
Other functions of control unit:
Throttle control............... Control unit commands throttle motor to adjust engine speed automatically in
accordance with the amount of the electrical consumption.
Electronic governor
An electronic governor takes the place of a convention-
al mechanical governor, and opens and closes the car-
buretor throttle valve electrically.
Components and functions:
■Inverter control unit
The control unit constantly monitors the AC output
from the control unit, and adjusts the throttle motor to
produce the necessary engine speed.
■Throttle motor (stepping motor)
The throttle motor receives pulses from the control unit
and opens or closes the throttle valve approximately 0.7
degrees per pulse.
Stepping motor
EF3000iSE new model guide 3/14/03 4:20 PM Page 3

Functions of electronic governor
The inverter control unit is preprogrammed with the
ideal engine speed settings in relation to electrical cur-
rent output, and uses these settings as a cross-reference
with the detected current output to control the throttle
motor (and consequently the throttle valve) to adjust
engine speed to an optimum level. Therefore, the
engine speed will always be at the appropriate level
according to the load on the system.
With an inverter generator, even if the engine speed
changes it has no effect on the output frequency.
The electronic governor system is maintenance-free as
it cannot be adjusted externally.
Throttle motor
Caution during resistance measurement:
Do not allow the lead wire of the tester to touch the next
terminal when measuring the resistance between termi-
nals.
Caution during assembly:
To prevent damage to the throttle valve when reassem-
bling the carburetor, re-install the carburetor with the
throttle valve fully opened.
Caution:
If the engine is difficult to start after the carburetor is
installed onto the engine, make the throttle valve fully
opened by hand and then start the engine.
Economy control operation and features
Because output frequency of an inverter generator is
unrelated to the engine speed, it becomes possible to
utilize a wide range of engine speed.
Therefore, it also becomes possible to use low engine
speed to meet a low electrical consumption.
With the EF3000iSE, the control unit commands the
throttle motor built into the carburetor to control the
throttle valve, which gives it the ability to continuously
control the engine speed, which in turn makes the econ-
omy control system possible.
However, economy control switch should be turned off in case of the following occasions.
1. When operating an electric motor, such as water pump, which requires a large starting current.
2. When the changes in voltage cannot be accepted.
3. When charging batteries.
– 4 –
Resistance 250ΩTerminal: F3-1, 3-5, 3-2, 3-4
500ΩTerminal: 1-5, 2-4
Throttle valve position:
During assembly: Close
During engine starting: Open
Economy Control Characteristics
EF3000iSE new model guide 3/14/03 4:20 PM Page 4

– 5 –
Economy switch ON : 2800 rpm (with no load)
Economy switch OFF: 3550 rpm
The engine will run at 2800 rpm with economy switch turned on, if the electrical consumption is below 1/4
of its rated output.
When a light and electric motor are connected to the generator at the same time, turning one of the devices on
and off causes a change in voltage and could have an adverse effect on the other device.
In these kinds of cases, first turn the economy switch off before use.
Throttle valve operation:
■The throttle valve is fully opened when the engine is not running.
■When the engine is started with no load, the throttle valve will be set in an almost completely closed
position as soon as the engine is started.
(When the economy switch is “ON”, it will be in a position to maintain 2800 rpm.)
■The engine speed will be adjusted according to the requirements of the load on the system.
■The throttle stops at the fully opened position when the engine is turned off in order to prepare for the
next attempt to start the engine.
In temperatures of zero degrees or below, the engine will automatically run at 3550 rpm for three minutes for
warming up purpose, even when the economy control switch is turned ON.
Continuous running time
EF3000iSE is able to run for 20.5 hours with 1/4 load
with fuel tank full, when economy control switch is on.
With rated load: 8.0 hours
With 1/4 load: 20.5 hours
EF3000iSE new model guide 3/14/03 4:20 PM Page 5

– 6 –
Frequency variation
In case of conventional synchronous generators, the
engine speed with no load is set at approximately 6 %
higher than rated engine speed (3600rpm for 60 Hz) to
maintain rated frequency when full rated load is
applied. This is the reason why no-load frequency is
slightly higher than rated frequency.
However, adapting an inverter system, which generates
genuine sine wave electricity, the frequency variation of
inverter generator is not influenced by the engine speed.
Therefore, an inverter generator provides constant AC
output frequency even if the load changes which is
equivalent quality to the commercial power supplies.
The frequency variation of EF3000iSE is less than 0.1 %.
Voltage variation
The output voltage with no load is approximately 10 %
higher than rated voltage in the case of conventional
synchronous type generators to achieve the rated volt-
age when full rated load is connected. Thus the voltage
variation occurs due to the change in engine speed and
the influence of the internal resistance.
However, adapting an inverter system, the voltage vari-
ation can be maintained minimum level, because the
output voltage cannot be influenced directly from
engine speed.
The voltage variation of EF3000iSE is smaller than 3%.
The waveform distortion rate of EF3000iSE is smaller than 2.5%.
Instantaneous frequency fluctuation & instantaneous voltage drop
■Momentary frequency fluctuation:
The frequency and voltage fluctuates momentary when
the load is altered if the engine cannot follow up the
load changes in the case of conventional synchronous
generators.
In contrast, the momentary frequency fluctuation of
EF3000iSE is as stable as the commercial power source
with this new inverter system.
The frequency fluctuation rate of EF3000iSE is less
than 0.1 %.
EF3000iSE new model guide 3/14/03 4:20 PM Page 6

– 7 –
■Momentary voltage drop:
However, the momentary voltage drop occurs, when large electric load is turned on.
This is caused by the fact that the electric energy stored in the condenser runs short momentarily until the
engine speed picks up to sufficient engine speed to compensate the energy shortage in the condenser.
The ratio of such momentary voltage drop and the rated voltage is defined as momentary voltage drop rate.
The momentary voltage drop rate of EF3000iSE is less than 20 %.
Naturally, the smaller the load capacity is applied, the smaller the momentary voltage drop becomes.
In case of incandescent lamps, large amount of rush current flows in the moment it is switched on. The rush
current may be as large as 10 times the rated current of the lamp. Therefore, when a large wattage incandes-
cent lamp(s) is switched on, the momentary voltage drop is greater.
■Settling Time:
It takes some duration to compensate the voltage from the momentary voltage drop by revving up the engine.
This duration is called settling time. In case of an EF3000iSE, the settling time is shorter than 2 seconds, when
a maximum rated load is turned on.
Electronic beaker
As opposed to the NFB used in synchronous type gen-
erators, the EF3000iSE uses an electronic breaker cir-
cuit housed in the control unit. When output from the
control unit exceeds a specific limit, output is automat-
ically interrupted to protect the generator from damage.
The control unit is designed to continuously monitor
the output current for overloads, and if the current over-
load continues longer than a specified time, output is
interrupted.
When using induction motors or similar devices (such
as underwater pumps) which require a large starting
current with the generator, the current will not be inter-
rupted even if the starting current exceeds several times
the generator’s rated output. Only when the large over current continues longer than a specified time, the con-
trol unit will interrupt the circuit, and in this way it resembles a mechanical NFB.
The engine must be stopped and power interrupted to the control unit in order for the system to reset after the
electronic breaker has activated.
An AC switch is not provided on the EF3000iSE, as it does not use a conventional magnetic type NFB.
Be sure the power switches on devices are OFF before connecting them to the EF3000iSE. After starting the
generator and the engine has warmed up, turn on the connected devices.
If a device’s power switch is ON when it is connected the generator and the generator is subsequently started,
the device may unexpectedly activate or start up as a result, creating a potentially dangerous situation.
Characteristics of Electronic Breaker
EF3000iSE new model guide 3/14/03 4:20 PM Page 7

– 8 –
Control panel
1Overload warning lamp
2Output indicator lamp
3Oil warning lamp
4Choke knob
5Fuel petcock
6Key switch (starter switch)
7Economy control switch
8DC output
9DC breaker (NFB)
0AC receptacles
Indicators
1Overload warning lamp
During power generation, if a problem occurs with a connected device, there is an overload, or the inverter
control unit overheats, the electronic breaker will be activated and interrupt power output to protect the gen-
erator and/or connected devices.
➢When the electronic breaker operates:
The engine continues to run, but the control unit stops output
The output indicator (green) turns off
The overload indicator (red) turns on
■When the overload warning light turns on:
➢Stop the engine.
Verify the required load of the connected device, and reduce to the rated load of the generator if necessary.
Verify whether or not there is a problem with a connected device. (A possible cause of excessive current
drain.)
Check for foreign matter in the cooling air inlet and areas around the control unit which could block incom-
ing air.
➢To return the generator to normal output operation:
Temporarily stopping the engine and re-starting automatically resets the system to its original state.
(The system cannot be reset unless power to the control unit is interrupted by stopping the engine.)
yui !0
treow q
yui!0
tre
o
wq
yui!0
treow q
yui !0
treow q
120 V 60 Hz (USA)
yui !0
treowq
230 V 50 Hz (Australia) 230 V 50 Hz (Europe)
120 V 60 Hz (Canada)
230 V 50Hz
EF3000iSE new model guide 3/14/03 4:20 PM Page 8

– 9 –
2Output indicator
When the generator is running normally and generating power, this indicator is lit green.
When using a device which requires a large starting current with the generator, the overload warning light
(red) and output indicator (green) will temporarily light simultaneously. This operation is normal.
After the connected device has started up, the overload warning light (red) will turn off, while the output indi-
cator (green) will continue to be lit.
3Oil warning lamp
As in previous Yamaha generators, the engine will shut off automatically when the oil level decreases to a
specified level.
When this happens and the recoil starter is pulled, the engine will not start and the oil warning light will turn
on.
Covers
Left cover
Control unit cover
Battery holder
Front cover Right ocver 2
Rght cover 1
Muffler cover
Rear cover
EF3000iSE new model guide 3/14/03 4:20 PM Page 9

– 10 –
Cooling system
The centrifugal fan equipped on the rotor performs forced air cooling of the system over the path listed below.
Each part of the system is therefore continuously kept at a stable operating temperature with only a single fan.
■Cooling air path
■Control unit cover
■Control unit
■Alternator
■Engine (cylinder)
■Muffler
Rotor Ass’y
Muffler
Cooling fan
Generator
cooling
air inlet
Flow of cooling air over generator and muffler
Controller
Cooling air inlets
Battery
Cooling air inlets
Recoil starter
Muffler
Generator fan
Generator cooling air inlet
Overall flow of cooling air
Control unit
Intake box
Cooling
air inlets
Fan case
Cooling fan
Flow of cooling air over generator and muffler
EF3000iSE new model guide 3/14/03 4:20 PM Page 10

DC 12 V output
DC output is provided on EF3000iSE exclusively for battery charging.
Rated output: DC 12V - 12A (12 V - 8.3 A for Canada)
DC 12V circuit is entirely separated from AC circuit.
Economy control switch must be turned off while charging a battery, as the engine speed 3550 rpm is required
to generate rated DC-output.
The total electric consumption of both the AC and the DC output should not exceed the total rated output of
the generator, which is 2800 VA, when both output are used together.
Rectifier (for DC output)
– 11 –
(+)
(–)
(~)
(~)
Polarity of rectifier 7VU-87105-00
Rectifier
G/Y R/W
B/W
B
B
R
R
R
RR
R
RR
R
M
R
R
R
B
B
L
L
L
L
B
R
RR
RR
R
R
G
GGG
G
G
O
O
O
O
O
O O
O
O
OO O
O
O
O
B/W
O
O
O
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
YY
Y
YY
Y
YY
L
L
R
G
L
LL
L
L
L
O
O
O
L
L
L
W
W
W
W
B
B
W
W
R/W
G/Y
G/Y
G/Y
Gy
G/Y
G/Y
G/Y
G/Y
B/W
B/W
B/W
B/W
B/W
R/W
R/W
B/W
B
B/W
B/W
B/W
R
R
R
R
R
O
Y
R
R
B
B
B
B
BB
R
Br
Br
Br Br
Br
Br
Br
Br
OFF
ON
START
RR
R
q
r
w
e
@1
@2
@3
@4
t
@0
!9
!6
!7
!5
i
!3
!2
!8
!4
!1
!0
o
uu
y
@5
1Main coil
2Sub coil
3DC coil
4DC rectifier
5Control unit
6AC pilot light
7AC receptacle
8Ground (Earth) terminal
9Economy control switch
0Overload indicator light
qDC receptacle
wDC protector (breaker)
eEngine switch
rOil warning light
tSpeed limiter assenbly
yOil level gauge
uT.C.I. unit
iSpark plug
oT.C.I. magneto
pStepping motor
aDC-DC converter
sRectifier
dBattery
fStarter relay
gStarter motor
EF3000iSE new model guide 3/14/03 4:20 PM Page 11

– 12 –
Battery charging
■Conditions of use of the DC power supply (exclusively for charging 12V battery)
The DC power supply is designed to charge a battery of 40AH which is half discharged.
12V battery
The time taken to charge a battery depends on how the battery is discharged. Charging is complete when the
specific gravity of the battery is 1.26-1.28. Check the specific gravity in every hour or so.
A 40AH battery of a compact car which is half discharged will be charged almost fully in about 3 hours. Be
sure to check the level of the electrolyte.
Do not take energy from the battery nor run the starter when the battery is being charged. This could cause a
large current to flow through the generator coil, burning it.
■Precautions for charging the battery
The battery will produce a flammable gas. The wrong handling might result in explosion or serious injuries.
Be sure to observe the following when charging a battery.
1) Keep fire and electric sparks away. Explosion might happen.
2) Secure a good ventilation where the battery is charged. Otherwise explosion might happen.
3) Be very careful to handle the electrolyte (diluted sulfuric acid). It will burn anything, so keep it away from
your eyes, skin and clothes.
First-aid procedures: If your skin or clothes catch the electrolyte, wash them with a great amount of water
immediately. If it enters your eyes, wash with a great amount of water and consult
the doctor immediately.
■Charging a 12V battery
Do not use for other than charging a 12V battery.
QWARNING:
9When handling a battery, keep good ventilation and keep electric sparks, like from short-circuit,
away. Also keep fire away. Explosion might happen because a flammable gas occurs from the bat-
tery.
9The battery electrolyte is diluted sulfuric acid. Remember that, if it comes to your eyes or skin, the
affected part will be burnt. If it should happen, wash the part with much water for at least 15 min-
utes and consult the doctor immediately.
9Before charging a battery, remove all cords connected to the battery, doing it first from the negative
side. When reconnecting, do the positive side first. If you do the wrong way, short-circuit could result.
EF3000iSE new model guide 3/14/03 4:20 PM Page 12

■Handling precautions
If you continue to charge the battery for many hours, the temperature of the electrolyte will rise and battery
performance may deteriorate.
Handling procedures vary with the type of battery.
1. Remove the cords and tubes from the battery and then remove the battery.
2. Measure the specific gravity of the battery.
9Remove the plugs from the battery and check the
electrolyte level. If it is near the lower limit
(LOWER), supply distilled water until the level
reaches the higher limit (UPPER).
9Be sure to supply distilled water. Use of the tap
water would result in a reduced service life of the
battery.
9Measure the specific gravity of the electrolyte
with a hydrometer.
9Measure the specific gravity in about every hour.
Make sure the reset is not turned off. (The battery
is considered to be fully charged when the spe-
cific gravity is 1.26-1.28.)
9Measure the specific gravity for each cell.
3. Connect the charging cord across the battery and DC
outlet. Start the engine to charge the battery.
When charging, set the economy control switch
at OFF.
To connect the cord, do in the order of the numbers
shown in the illustration. To remove the cord,
reverse the connecting order.
QWARNING:
Make sure of the polarity, +and -, of the charging
cord. If you connect it in the wrong polarity, short-
circuit could result. A flammable gas occurring from
the battery may explode. The alternator and/or bat-
tery may also fail.
4. On completion of charging, stop the engine and remove the charging cord in the reverse order of installing
it.
– 13 –
3
2
Charging cord
1
Hydrometer Electrolyte
Upper level
Lower level
EF3000iSE new model guide 3/14/03 4:20 PM Page 13

– 14 –
Introduction of Power Boost Technology
EF3000iSEB is equipped with a DC-DC converter, which supplies supplemental electric current to the invert-
er control unit to boost up the generator output for maximum 10 seconds.
DC-DC converter (Power Boost Technology)
DC-DC converter is an electrical device to step up DC
voltage. In case of EF3000iSEB, DC-DC converter step
up the battery voltage, 12 volts, to 190 volts.
DC-DC converter is automatically activated to increase
generator output when the AC output current exceeds
20 amps and the voltage at the condenser inside the
control unit drops down to below 190 volts.
The power source is a 12-V battery that is installed in
the generator to operate starter motor. DC-DC convert-
er works for maximum 10 seconds, only when large
amount of starting current is needed and increases max-
imum output of generator from 3000 VA to 3200 VA
temporarily.
Specifications of DC-DC converter
1. DC input 12V battery
2. DC output DC190 V
3. Rated DC current 2.53 A
Control Unit
DC-DC converter
EF3000iSE new model guide 3/14/03 4:20 PM Page 14

– 15 –
* Overload indicator lamp :
The DC-DC converter is turned on automatically, when
the generator output exceeds over 180 % of its rated
load to boost generator output to assist the starting cur-
rent of the load, such as an air conditioner.
When the DC-DC converter is turned on automatically,
the generator is obviously overloaded, thus the overload
indicator lamp blinks quickly with 0.5-second interval
for 10 seconds. And the lamp blinks slowly with 1-sec-
ond interval for 3 minutes and 50 seconds. During this
period, the DC-DC converter is prevented from reboot-
ing to prevent the battery from over-discharged.
Designation of LED indicators:
DC-DC converter unit is equipped with two indicator lamp (LED) on the unit. When the DC-DC converter is
activated automatically, indicator lamps are lit or blink to designate the state of the system. The designations
of indicator lamps are listed in the table below.
NOTE:
The red LED turns ON and interrupts DC-DC converter output automatically to protect the component, when
any of the abnormal operating conditions is detected, and returns to normal operation automatically as soon
as the abnormality is recovered.
Abnormal conditions are:
1) Too high temperature in the component
2) Too low battery voltage, below 9.5 V
3) Too high battery voltage, over 18 V
Green LED Red LED Designation
ON OFF Standby mode
Blink OFF Output (for 10 seconds maximum)
OFF Blink For 10 seconds after shutdown
OFF ON Alarm mode
          
EF3000iSE new model guide 3/14/03 4:20 PM Page 15

– 16 –
Engine
Type: MZ175
4-stroke, OHV, Single cylinder, Air cooled,
Lubrication: Splash oil
Displacement: 171 cc
Bore ×Stroke: 66.0 ×50.0 mm
New specification:
Valve clearance: 0.2 mm (IN/EX)
Main features:
8Ignition system with engine speed limiter
8Oil warning system
8Auto de-compressor system
8Valve stem oil seal on intake valve
8Stellite exhaust valve
Difference from EF2800i
The intake port of the cylinder head is altered to improve engine performance.
The push rod is altered to reduce operating noise of the engine.
MZ175 Engine
Valve
clearance
Cylinder
head
Air
shroud
EF2800i (7VU) EF3000iSE (7WL)
Steel
SteelAluminumSteel
ID mark
EF3000iSE new model guide 3/14/03 4:20 PM Page 16

– 17 –
Ignition system
TCI ignition system is equipped with a speed limiter
function.
Speed limiter: 4500 rpm
The ignition coil and TCI unit is a single built-in unit, while the speed limiter unit is a separate component
installed in the control box.
Oil warning system
The oil-warning unit is built in the speed limiter unit.
The oil-warning switch is installed in the crankcase.
When the engine oil level drops below the specified
level, the ignition system is killed and the engine will
be automatically stopped. This function prevents the
engine from serious damage.
The oil-warning lamp turns on by attempting to start the
engine so as to warn the operator that the engine oil
should be replaced or refilled.
Oil warning switch
Ignition coil & TCI
Speed limiter Speed limiter
EF3000iSE new model guide 3/14/03 4:20 PM Page 17