Rato R740 User manual

R740
Service Manual
Chongqing RATO Technology Co., Ltd.

This Manual covers specifications that shall be followed in the process of regular maintenance
and troubleshooting of generator sets.
Make sure the equipment's maintenance staff can refer to this Manual at any time.
This Manual describes correct methods to service this equipment. The Company does not
undertake any liability for any personal casualty and equipment damage caused due to
ignoring these rules.
Note:
The copyright of this Manual belongs to the Company. It is not allowed to reproduce this
Manual without written consent of the Company, and corresponding responsibility will be
taken for violation.

Safety Warnings
The personal and property safety of you and others is very important. Please carefully read the
three kinds of extremely important safety warnings that we have described in the Service
Manual and on the decals of the generator sets. There is the symbol in front of each
safety warning. Details are as follows:
Failure to follow instructions will lead to extremely serious injuries.
Failure to follow instructions may lead to very serious injuries.
Failure to follow instructions may lead to minor injuries.
Failure to follow instructions may lead to damage to your generator sets and
other properties.

Contents
Part I Introduction ......................................................................................................................1
1-1 Engine components.......................................................................................................1
1-1-1 Structural features......................................................................................................1
1-1-2 Gasoline engine model and No..................................................................................2
1-2 Product parameters........................................................................................................2
1-3 Service standards ..........................................................................................................3
Part II Maintenance....................................................................................................................4
2-1 Maintenance list............................................................................................................4
2-2 Oil ................................................................................................................................. 4
2-3 Air filter.........................................................................................................................5
2-4 Spark plug.....................................................................................................................6
2-5 Adjustment of valve clearance...................................................................................... 7
2-6 Governor .......................................................................................................................9
Part III Fault Judgement and Repair ........................................................................................10
3-1 Fault judgement ..........................................................................................................10
3-1-1 Start difficulty..........................................................................................................10
3-1-2 Underpower............................................................................................................. 11
3-1-3 Unstable speed.........................................................................................................12
3-1-4 Unable to ignite .......................................................................................................12
3-1-5 Overheating of general-purpose gasoline engine ....................................................13
3-1-6 Abnormal sound....................................................................................................... 13
3-1-7 Failure of power generation of the generator ..........................................................13
3-2 Pre-maintenance preparations.....................................................................................14
3-2-1 Safety factors...........................................................................................................14
3-2-2 Special tools.............................................................................................................15
3-3 Disassembly chart.......................................................................................................16
3-4 Gasoline engine...........................................................................................................16
3-4-1 Air director............................................................................................................... 16
3-4-2 Impeller/flywheel/ignition coil/charging coil..........................................................17
3-4-3 Air filter ................................................................................................................... 20
3-4-4 Gasoline pump and carburetor.................................................................................20
3-4-5 Cylinder head/valve.................................................................................................26
3-4-6 Muffler.....................................................................................................................31

Disassembly and assembly................................................................................................32
3-4-7 Starting control box .................................................................................................39
3-4-8 Starter motor............................................................................................................43
3-5 Electrical schematic diagram (electric starting type)..................................................44
Appendix..................................................................................................................................45

Part I Introduction
1
Part I Introduction
1-1 Engine components
1-1-1 Structural features
Muffler
Air filter
Starting
control box
Radiator
Fuel drain
bolt
Governing
bracket
Starter motor
Spark plug
Oil level gauge

Part I Introduction
2
1-1-2 Gasoline engine model and No.
1-2 Product parameters
Gasoline engine
R740D
Gasoline engine
Type of gasoline engine
Air-cooled, 4-Stroke, OHV, V-Twin
cylinder
Displacement (cc)
739.3
Ignition system
Transistor magnet ignition (contactless)
Fuel tank volume (L)
None
Minimum fuel consumption rate, g/kw.h
≤374
Oil capacity (L)
1.6L
No-load speed
3800
Rated output power (kW)
15
Maximum output power (kW)
16.8
Big air filter
●
Big muffler
●
Big oil tank
●
General-purpose
assembly
Fuel level indicator
●
Voltmeter
●
Three-in-one digital display
●
Voltage regulator (AVR)
●
Oil alarm system
●
Circuit breaker
●
Electric starting accessory
●
Note: ● means provided; - means not provided
Model
Finished product No.
Serial No.

Part I Introduction
3
1-3 Service standards
Gasoline engine
Part
Item
Standard
Service limit
Gasoline engine
Maximum no-load speed
Cylinder pressure
3180-3800 rpm
1.25MPa/1400rpm
--
--
Cylinder
Cylinder bore diameter
82mm
82.195mm
Cylinder head
cover
Warping
--
0.10mm
Piston
Outer diameter of piston skirt
Piston-cylinder clearance
Inner diameter of piston pinhole
Outer diameter of piston pin
Piston pin-piston pinhole clearance
81.962~81.98mm
0.02~0.058mm
17.004~17.01mm
16.992~16.998mm
0.006~0.018mm
81.86mm
0.12mm
17.048mm
16.954mm
0.08mm
Piston ring
Piston ring side clearance: top ring/ring 2
Oil ring
Piston ring closing clearance: top ring/ring 2
Oil ring
Piston ring width: top ring/ring 2/oil ring
0.03~0.05/0.02~0.04mm
0.04~0.11mm
0.2~0.35/0.35~0.5mm
0.2~0.7mm
1.17~1.19mm
1.91~1.97mm
0.135mm
0.31mm
1.0mm
1.5mm
0.77mm
1.46mm
Connecting rod
Inner diameter of small end
Inner diameter of big end
Big end oil film clearance
Small end side clearance
17.005~17.016mm
40.01~40.022mm
0.03~0.054mm
0.2~0.6mm
17.052mm
40.066mm
0.12mm
1.0mm
Crankshaft
Outer diameter of main journal
39.968~39.98mm
39.92mm
Air valve
Valve clearance
Outer diameter of valve
stem
Conduit inner diameter
Tappet clearance
Valve seat contact width
Free length of spring
Intake
Exhaust
Intake
Exhaust
Intake/exhaust
Intake
Exhaust
0.1~0.15mm
0.15~0.2mm
6.466~6.475mm
6.451~6.46mm
6.5~6.515mm
0.025~0.049mm
0.04~0.064mm
0.7~1.0mm
39.4mm
--
--
6.318mm
6.275mm
6.562mm
0.10mm
0.12mm
2.0mm
38mm
Camshaft
Cam height Intake
Exhaust
Outer diameter of journal
4.64~4.80mm
4.64~4.80mm
15.959~15.977mm
4.35mm
4.35mm
15.916mm
Crankcase cover
Inner diameter of camshaft bore
16~16.018mm
16.048mm
Carburetor
Float height
13.2mm
--
Spark plug
Clearance
0.7~0.8mm
--
Spark plug cap
Resistance
9~11kΩ
--
Ignition coil
Resistance
Ignition coil clearance
Primary side
Secondary side
0.8-1.0Ω
5.9-7.1kΩ
0.35~0.45mm
--
--
--

Part II Maintenance
4
Part II Maintenance
2-1 Maintenance list
Good maintenance is the best guarantee to realize safe, economical and zero-fault operation. It is also
conducive to environmental protection.
The exhaust gas of the engine contains toxic carbon monoxide. Please shut down the
gasoline engine for maintenance.
If maintenance needs to be carried out while the engine is running, you should make sure
that the work area is well ventilated.
Regular maintenance can ensure that the engine works in good condition. The maintenance schedule is as
follows:
●The oil shall be replaced every 10 h if it is frequently operated under high temperature or high load.
●The air filter element shall be cleaned every 10 h if it is frequently operated in dusty or harsh
environment; the air filter element shall be replaced every 25 h if necessary.
●The maintenance shall be carried out according to the time shown in the table above for the spot
inspection period and time.
●If the maintenance interval has expired, the maintenance shall be carried out according to the above
table as soon as possible.
2-2 Oil
Replace the oil.
Warm up the gasoline engine (start the engine with no load for 10 minutes) and let it stand for another 40
minutes so that the oil can be drained quickly and cleanly.
Maintenance period
Item
Every
time
1st month
or 10 hours
at the first
time
Every 3
months or 20
hours
Every 6
months or
50 hours
Every year
or 100
hours
Engine oil
Check-fill
√
Replace
√
√
Air filter
element
Check
√
Clean
√
Replace
√
Spark plug
Clean-adjust
√*
Spark arrester
Clean
√
Valve
clearance**
Check-adjust
√
Fuel pipe
Check
Every two years (please replace it if necessary)
Cylinder head
and piston
Clear carbon
deposits**
Every 125 hours;
*The item shall be replaced if necessary;
**These items shall be maintained by the dealer authorized by our company, unless the user has proper
tools and maintenance capability.

Part II Maintenance
5
①. Remove the fuel drain bolt. Then, open the
fuel drain dipstick to drain the oil.
②. Install and tighten the fuel drain bolt.
③. Fill the oil to the specified position (as
shown in the right figure), and check the oil
level.
④Install the oil dipstick.
Gasoline engine oil capacity: 1.6L for R740; 1.8L for the first use; 1.6L from the second use.
Recommended
gasoline
engine oil
General purpose oil SAE15W-40 SJ, or SAE10W-30 gasoline engine oil equivalent to
API SJ.
※ At low temperatures (below 10℃), use (SAE10W-30) >.
※ In cold weathers (below -15℃), use cold area oil SAE5W-30, or SAE5W-30
gasoline engine oil equivalent to API SJ.
Environmental temperature
Long-term and frequent contact with oil may lead to skin cancer. Although this is not
certain, it is still recommended to avoid direct contact as much as possible. In case of
contact, wash the skin that has been exposed to oil with soap and water immediately and
thoroughly.
To protect the environment, please properly dispose of the waste oil. We strongly recommend you to:
contain the waste oil with the sealed container and then send it to the local service station or the waste oil
recycling center. Remember: Do not throw oil into the garbage or dump it on the ground or in the ditch.
2-3 Air filter
Dirty air filter will affect the flow of air into the carburetor. To prevent carburetor faults, please maintain
the air filter regularly. (Please refer to 2-1 maintenance list for frequency, and the figure below for the
method)
If it is used in the dusty environment, it should be maintained more frequently.
Oil level upper limit
Oil level lower limit
Fuel drain bolt

Part II Maintenance
6
Cleaning the filter element with gasoline or flammable solvent may lead to fire or
explosion. Please clean it with soapy water or nonflammable solvent.
Do not start the generator without air filter, otherwise it will accelerate the wear of the
gasoline engine.
1) Twist out the locking handle assembly and remove the fan guard decoration sheet.
2) Twist out the locking nut assembly of the air filter and remove the air filter housing cover.
3) Remove the air filter buckle, and then remove the foam filter element and the paper filter element.
2-3-1 Inspection and cleaning
1) Check the two air filter elements for holes and cracks, and replace them if so.
2) Clean filter element
Foam filter element: wash it in warm soapy water
and dry it thoroughly. Or wash it in non-flammable
solvent, and dry it. Do not make the foam stained
with oil.
Paper filter element: place the filter element on a hard surface, gently fold it for several times to remove
dirt, or use compressed air [no more than 207KPA,2.1kg/cm2].
3) Wipe the dirt on the inside of the air filter housing and cover with a wet rag. Be careful not to let dirt
enter the air duct connected to the carburetor.
4) Install the foam filter element inside the air filter cover. Reinstall the paper filter element and the air
filter cover on the air filter housing.
2-4 Spark plug
Recommended spark plug model: F5RTC
Foam filter
element
Fan guard decoration sheet
Hexagon flange bolt small series M6×35 (2 pieces)
Air intake
pipe cover
Paper filter
element
Locking nut assembly of the
air filter
Foam filter
element
Air filter seat
assembly
Air filter gasket
Air filter buckle
Air filter housing
cover
Locking handle assembly

Part II Maintenance
7
①. Remove the spark plug cap.
②. Remove the spark plug with the spark plug socket
wrench.
③. Visually inspect the spark plug insulator for damage. If
the insulator is damaged, replace it with a new one. If the
electrode has carbon deposits, clean it with a wire brush.
④. Measure the spark plug clearance with feeler gauge.
The proper clearance shall be 0.70-0.80 mm; if adjustment
is required, tap (when the clearance is large) it or gently
pry up the electrode with a straight screwdriver (the gap is
too small).
⑤. Check that the spark plug washer is in good condition.
⑥. Install the spark plug, tighten it on the cylinder head
with a spark plug socket wrench, and install the spark plug
cap.
In order to prevent disorderly thread when installing the
spark plug, first screw in the spark plug with hand in the
direction indicated by the arrow (on the threaded hole of
the cylinder head), and then tighten it with the special
socket.
If a new spark plug is installed, an additional 1/2 turn shall
be tightened after pressing the washer.
If a used spark plug is reinstalled, an additional 1/8-1/4
turn shall be tightened after pressing the washer.
Spark plug torque value: 22 ± 2 N·m
2-5 Adjustment of valve clearance
There is a certain valve clearance between the tail end of the valve stem of the gasoline engine and its
transmission part to prevent the normal operation of the gasoline engine from being influenced by part
expansion and contraction. During work, too large valve clearance will lead to poor exhaust, which will not
only affect the dynamic performance of the gasoline engine but also increase noise (abnormal valve noise);
while, too small valve clearance will lead to loose valve closing, which will result in the failure of normal
operation of the gasoline engine and may result in the damage to the working surface of the parts of the
valve train.
Generally, the valve clearance of the gasoline engine must be checked and adjusted after 1 year or 300h
hours of use.
The valve clearance must be measured when the gasoline engine is cold.
Please note that there will be oil leakage when the cylinder head cover is disassembled.
Spark plug socket
Clearance
Measuring electrode
Wire brush

Part II Maintenance
8
1) Remove the cylinder head cover bolt and the
cylinder head cover.
2) Remove the air director plate.
3) Rotate the flywheel to align the mark on the
flywheel with that of the air director. The No.
1 cylinder valve clearance can be adjusted.
4) Insert a feeler gauge between the valve and
the valve rocker arm to check the clearance
5) Then, rotate 270°, and adjust No. 2 cylinder
valve clearance.
Adjust the valve clearance
Adjustment steps: unscrew the locking nut; rotate the adjusting nut to obtain the correct valve clearance;
tighten the locking nut.
Valve clearance
Intake
0.1±0.02mm
Exhaust
0.15±0.02mm
Adjusting screw
Valve clearance
Tighten
Decrease
Loosen
Increase
Too large clearance: Late opening of intake and exhaust valves shortens the intake and
exhaust time, reduces the valve opening height, changes normal valve timing and decreases the gasoline
engine's power due to insufficient air intake and incomplete air exhaust; additionally, it also increases the
impact of valve system parts and accelerates the wear.
Too small clearance: After the gasoline engine is operated, the part is heated and expanded to push the
valve open and make the valve close loosely, which will cause air leakage, power reduction, and serious
carbon deposition or burning on the sealing surface of the valve, and even cause that the valve strikes the
piston.
Cylinder head cover bolt
Cylinder head
cover

Part II Maintenance
9
2-6 Governor
1) Remove the air filter.
2) Unscrew the governing arm nut.
3) Check whether the throttle lever is in the high
speed position.
4) When rotating the governing arm shaft
counterclockwise, tighten the governing arm
nut.
5) Move the governor arm to the low speed
position and check whether the throttle arm is
in contact with the throttle stop screw.
Maximum speed
3800rpm
Too high speed
Rotate the adjusting screw counterclockwise.
Too low speed
Rotate the adjusting screw clockwise.
Governing screw

Part III Fault Judgement and Repair
10
Part III Fault Judgement and Repair
3-1 Fault judgement
3-1-1 Start difficulty
Phenomenon
Cause
Remedy
Normal cylinder
compression
Normal
spark of
spark
plug
Abnormal
fuel
system
Impeded
fuel flow or
no fuel flow
No fuel in fuel tank
Refuel
Clogged venthole of fuel
tank cap
Dredge
Main measuring hole is
improperly adjusted or
blocked
Re-adjust or clean, blow through
Float needle hole is
blocked
Remove needle valve for repairing,
cleaning and blowing through
The float is stuck or
damaged
Repair the float
Unobstructe
d fuel flow
Fuel is too dirty or
deteriorated
Replace fuel
There is water in fuel
Replace fuel
There is excessive fuel in
the cylinder
Drain the fuel, and wipe and dry spark
plug electrode
Fuel label is incorrect
Use according to specified label
Normal
fuel
supply
system
Spark of
HV wire
is normal
Spark plug
is poor
Electrode is dirty with
carbon deposit
Remove the dirt and carbon deposit
Insulator is damaged,
electrode is severe ablated
Replace the spark plug
Electrode clearance is
incorrect
Adjust electrode clearance
HV wire
has no
spark
Spark plug
is normal
HV wire is damaged
Replace the HV wire
Ignition coil is damaged
Replace the ignition coil
Magnet is demagnetized
Replace the flywheel
The clearance between
ignition coil and flywheel
is abnormal
Adjust the clearance between ignition coil
and flywheel
Phenomenon
Cause
Remedy
Cylinder
compression is
poor
Normal fuel supply
system
The ignition
system is
normal
Piston ring wear exceeds
the limit
Replace it with complete set of new ring
Piston ring is broken
Replace it with complete set of new ring
Piston ring is stuck
Clear carbon deposit
The spark plug is not
provided with sealing
gasket or is not tightened
Mount the gasket and tighten it
Air leakage of joint face
between the cylinder body
and the cylinder cover
Check the flatness of joint face of cylinder
pad and cylinder body and cylinder cover
And tighten cylinder cover bolts
according to specified torque and
sequence
Valve leakage
Check valve clearance and valve
tightness, repair when necessary

Part III Fault Judgement and Repair
11
If gasoline engine is still unable to be started, please send it to authorized dealer of the Company for
overhaul.
Spark detection
(During the spark-over test of the spark plug) Ensure that there is no spilled fuel outside the gasoline engine
and the spark plug is not soaked by fuel.
In order to prevent fire, keep sparks away from spark plug hole.
When doing testing to the spark plug, it is strictly prohibited to hold the spark plug HV wire with wet hand.
When operating, put the fuel switch in the "OFF" position, and drain
off the fuel in the carburetor.
Remove the spark plug cap and spark plug.
Pull the starter handle to release unburned gas out of the cylinder.
Assemble spark plug cap.
Turn the generator switch to the "ON" position.
Ground the negative electrode (threaded part) of spark plug via the
cylinder cover, pull the starter handle to observe the spark condition.
3-1-2 Underpower
Phenomenon
Cause
Remedy
When raising the
throttle, the speed
increases slowly, and
the speed decreases
or the engine shuts
down when it is
serious
Fuel supply
system
There is air in oil way or the oil way
is blocked
Exhaust and dredge oil way
The main measuring hole is
improperly adjusted
Adjust the main measuring hole again.
Needle valve hole and the main hole
are blocked in the carburetor
Clean, and blow through
Fuel tank switch is clogged
Clean and replace damaged part
There is carbon deposit in the
combustion chamber.
Clear carbon deposit
Blockage of air filter
Clean filter element
Poor
compression
Wear of piston, cylinder and piston
ring
Replace worn parts
Air leakage of joint face between the
cylinder body and the cylinder cover
Replace the cylinder pad
Valve clearance is too large (too
small)
Readjust
Valve seal is not tight.
Repair
Compression pressure inspection

Part III Fault Judgement and Repair
12
Remove the spark plug cap and the spark plug, and
install the cylinder pressure gauge at the spark
plug hole.
Pull the starter for several times and measure the
compression pressure.
Atmospheric pressure in cylinder
(≥1.25MPa/1300r)
3-1-3 Unstable speed
Phenomenon
Cause
Remedy
There is knocking
noise in the
gasoline engine
Excessive wear of piston, cylinder and piston ring
Replace worn parts
Excessive wear of piston pin and pin hole
Replace the piston or piston pin
Excessive wear of small end of connecting rod
Replace the connecting rod
Deflagration
Gasoline engine overheating
Find the cause and eliminate
There is carbon deposit in the combustion chamber.
Clear carbon deposit
Unqualified gasoline
Replace with qualified gasoline
Misfire of
gasoline engine
There is water in float chamber
Clean the float chamber
Electrode clearance of spark plug is improper
Adjust electrode clearance
Ignition coil failure, etc.
Check and replace damaged parts
3-1-4 Unable to ignite
Phenomenon
Cause
Remedy
Unable to ignite
Fuel supply
system
Fuel used up
Refuel
Carburetor is clogged
Check oil way and dredge it
Fuel leakage of float chamber
Repair float needle valve
Needle valve is stuck
Disassemble the float chamber,
and remedy the trouble
Ignition system
Spark plug is broken through with
carbon deposit and short circuit
Replace the spark plug
The side electrode of the spark
plug fell off
Replace the spark plug, and
remove fallen object
Falling-off of HV wire
Replace the HV pack
Breakdown and short circuit of
ignition coil
Replace the ignition coil
Blow-out line is placed on the
body
Find short circuit point and
re-insulate
Other
Severe cylinder scraping,
falling-off of the valve
Repair and replace damaged
parts
Pressure gauge

Part III Fault Judgement and Repair
13
3-1-5 Overheating of general-purpose gasoline engine
Phenomenon
Cause
Remedy
Gasoline engine
overheating
Insufficient oil
Fill sufficient oil
Exhaust port is blocked
Clean exhaust port
Leakage of air director
Repair damaged place
Sundries blockage in the middle of cooling fins
Clean cooling fins
Deformation of connecting rod causes the wears of the
piston and cylinder liner edge
Replace the connecting rod
Wears of cylinder, piston and piston ring causes air
leakage between cylinder and crankcase
Replace worn parts
Gasoline engine governor is improperly adjusted,
causing the speed to be too high
Re-adjust the governor
3-1-6 Abnormal sound
Phenomenon
Cause
Remedy
Knocking noise
Wear of piston, cylinder and piston ring
Replace worn parts
Wear of connecting rod, piston pin and pin hole
Replace worn parts
Wear of main journal of crankshaft
Replace the bearing
Piston ring is broken
Replace piston ring
Too large valve clearance
Adjust the valve clearance
Metal knocking
noise generates
during deflagration
Excessive carbon deposit in combustion chamber
Clear carbon deposit
Fuel label is incorrect
Replace fuel
Gasoline engine overheating
Find the cause and eliminate
Other
The valve clearance is improperly adjusted
Re-adjust the valve clearance
Loose connection between flywheel and crankshaft
Reassemble
3-1-7 Failure of power generation of the generator
Phenomenon
Cause
Remedy
The generator
cannot generate
electricity
The collecting ring and the carbon brush are
contacted poorly
Clean the surface of the collecting
ring and grind the arc surface of the
carbon brush
The brush spring pressure is abnormal
Replace the spring or carry out
adjustment
Stator and rotor output wires of the generator
are contacted poorly The panel, instrument and
power socket are contacted poorly
Check that the winding connector is
reliable and the panel instrument
and power socket are correct, or
replace the defective parts.
Loss of excitation
Carry out charging
Check each winding for grounding or
breakdown
Check and insulate them one by
one.
Check the main winding and the excitation
circuit of the stator for open circuit.
Check and connect the open circuit
section by section.
AVR fault
Replace AVR

Part III Fault Judgement and Repair
14
3-2 Pre-maintenance preparations
3-2-1 Safety factors
Failure of observing the following precautions will cause the void of warranty commitment
provided with the engine, and it may damage the engine or cause personal injury. Therefore, before
operating the engine, the user shall pay special attention to following points:
1) Strictly carry out the matching according to power shown on the nameplate. It is strictly forbidden to
operate under overload and over-speed or low speed for a long term.
2) Apply fuel and oil with code designation, which must be fully precipitated and filtered before use.
Refueling appliance shall be maintained clean, and the oil shall be replaced regularly.
3) Check the tightness of fastening bolts of the engine regularly, and tighten them in time.
4) Clean the air filter element regularly and replace it if necessary.
5) This engine is air-cooled gasoline engine, so the debris and dirt on cooling fins, air directors and other
components shall be removed in time to ensure normal cooling of the gasoline engine.
6) The operator shall be familiar with the working principle and structure of the engine, and understand
how to operate emergency shut-down and all control components. Adhere to regular maintenance and
service, and eliminate the fault found in time, and prohibit continuous operation of the engine after the
failure.
7) When operating, please make sure that the engine shall be at least one meter away from the building and
other equipment, and maintain good ventilation. Do not place flammable materials (such as gasoline and
matches) nearby the engine or close to the running engine to avoid fire.
8) Refuel at a well-ventilated place. The engine shall be shut down when refueling. Do not smoke or make
naked flame or spark in the place where the engine is fueled or in fuel storage site.
9) Do not overfill the fuel tank to cause overflowing of fuel. If there is fuel spilling, it must be thoroughly
removed, and the generator shall not be started until spilled fuel is volatilized.
10) Do not operate the engine in a confined place or poorly ventilated place.
11) When the engine is running and within a period of time after it is shut down, it is strictly forbidden to
touch the muffler to avoid scalding. In order to avoid getting burnt or fire, the generator shall not be
handled or stored until it cools down.
12) Safety warning label
Please read the warning label carefully before operating the engine; our company will not be liable for the
personal injury or equipment damage caused by ignoring the warning label.

Part III Fault Judgement and Repair
15
3-2-2 Special tools
Tool name
Application location·Remarks
Float height gauge
Valve guide replacer
Outer seat ring assembler
Assembler handle
Inner seat ring assembler
Diamond grinder 45°
Diamond grinder 32°
Flywheel puller
Bearing puller
Valve guide reamer
Inspection of oil level of the carburetor
Disassembly and installation of valve guide
Assembly of the ball bearing
Installation of the handle on the assembler and installation of
the bearing
Assembly of the ball bearing and the timing gear
Correction of intake and exhaust valve seat surface
Correction of intake and exhaust valve seat surface
Disassembly of flywheel
Disassembly of the ball bearing
Finish reaming of inner diameter of valve guide