LIFAN Power USA 2V77F User manual

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PREFACE
Thank you for choosing the general gasoline engine produced by our company.
Based on the latest technology domestic and abroad, our Company, has individually developed general gasoline
engine 2V77F with 4-stroke, V-shaped cylinder, forced-air cooling. The engine is characterized by advanced design,
compact structure, reliable performance, convenient maintain, economic use, easy speed governing etc. It is widely
used as ideal power in many fields such as generator, construction, field working, forestry machine, etc. The main
hardware, such as crankcase, crankcase cover, cylinder all use aluminum alloy. Because of the using of automatic
decompression mechanism and centrifugal flyweight speed governor, the starting is very convenient and reliable. Other
type use level sensitive protection system, avoiding the suddenly damage caused by bad lubrication.
The manual gives information about the operation and maintenance of gasoline engine 2V77F and 2V77F-A.
2V77F is started by electricity while 2V77F-A is started by electricity or manual. Please read it carefully before
operating. To extend the service life, users should strictly follow the stipulations stated in the manual to carry out
operating and maintenance. We have maintaining place on local place, it will supply offer you the service.
This manual should be considered a permanent part of the engine and should remain with it if it is resold.
All the materials and diagrams of this manual are in accordance with the newest products at the publishing time.
Due to revision and other change, the information descried in this manual may be a little different from the actual status.
The manual is subject to change without notice.
The copyright of this manual belongs to our Co, any group or individual is forbidden to reprint or copy any it.

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IMPORTANT NOTICES
Please pay special attention to statements preceded by the following words:
WARNING
●A warning is used to alert the user to fact that hazardous operation and maintenance procedures may result in
injury to or death of personnel if not strictly observed.
CAUTION
●A caution is used to alert the user to fact that hazardous operation and maintenance procedures may result in
injury to personnel or destruction of equipment if not strictly observed.
NOTE
●Give helpful information.
This manual should be considered as a permanent part of the unit and should remain with the unit when resold.

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CONTENTS
SAFETY PRECAUTIONS...............................................................................................................................................6
PARTS DESCRIPTION...................................................................................................................................................7
BATTERY CONNECTION(electric-start type)............................................................................................................8
CONTROL CONNECTION OF REMOTE DISTANCE (OPTION)........................................................................10
PRE-OPERATE INSPECTION ....................................................................................................................................12
Ⅰ. Engine oil............................................................................................................................................................12
Ⅱ.Air cleaner............................................................................................................................................................13
Ⅲ. Fuel and fuel tank................................................................................................................................................14
STARTING THE ENGINE............................................................................................................................................15
RUNNING THE ENGINE .............................................................................................................................................17
Ⅰ. Engine oil alarm..................................................................................................................................................17
Ⅱ.Breaker.................................................................................................................................................................18
STOP................................................................................................................................................................................19
EXHAUST CONTROL SYSTEM.................................................................................................................................20
MAINTENANCE............................................................................................................................................................22
Ⅰ. Maintenance schedule.........................................................................................................................................22
Ⅱ. Maintenance method...........................................................................................................................................23
TRANSPORT, STORAGE AND REMOVAL FROM STORAGE............................................................................32
TROUBLESHOOTING .................................................................................................................................................34

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Ⅰ. Start engine difficultly.........................................................................................................................................34
Ⅱ. Low gasoline engine power output .....................................................................................................................36
Ⅲ. Gasoline engine cannot run smoothly.................................................................................................................37
Ⅳ. Stop suddenly when running...............................................................................................................................38
Ⅴ. Gasoline engine is excessively hot......................................................................................................................39
Ⅵ. There exists abnormal noise when engine running .............................................................................................40
SPECIFICATIONS.........................................................................................................................................................41
Ⅰ. Main specification...............................................................................................................................................41
Ⅱ. Torque of important bolts....................................................................................................................................42
Ⅲ. Fitting clearance and wear limit..........................................................................................................................43
ELECTRIC DIAGRAM.................................................................................................................................................44

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SAFETY PRECAUTIONS
WARNING:
Before operating the engine, be sure to read and familiar with the manual carefully, otherwise personal
injury or equipment damage may occur.
Please pay special attention to the following:
1. Running the engine in a well-ventilated place, keep it at least one meter away from building walls or other
equipments, keep away from inflammables such as gasoline, matches and so on to avoid possibility of fire.
2. This engine should not be used underground.
3. This engine should not be used in areas where explosive conditions are present.
4. Keep the engine out of reach of children and pets to avoid accidents.
5. Operator of the engine has been specially trained.
6. Refuel in a well-ventilated area with the engine stopped, and in places refueling or storing gasoline, no smoking and
any flames or sparks.
7. Refuel the fuel tank not too full so as to avoid fuel’s spilling out. If there is spilled fuel around, be sure to clean it
thoroughly before starting.
8. Locate the engine on a level-working platform to avoid fuel’s spilling out.
9. Maker sure the fuel filler cap is tightened securely.
10. The exhaust muffler is very hot during running the engine even after the engine stops. Never touch it, or you may
get burns. Transport or store the engine with it cooling down entirely.
11. This machine should not be used underground or in areas where explosive conditions may be present.
12. It’s recommended that the operator wears the ear protection equipment during operation.

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PARTS DESCRIPTION
Fig. 1

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BATTERY CONNECTION(electric-start type)
In the case that the specifications of the battery are 12V and more than 45A.h, connect its positive lead to the
electromagnetic coil while connect its negative lead to
engine mount strew, base screw or any place capable
of grounding with the engine well.
Make sure the battery leads are connected tightly
and no corrosion. If any, eliminate it.
WARNING:
●The battery may give off explosive gas, keep sparks, flames and cigarettes away. Charge or use it in an
area with good ventilation.
●The battery contains sulfuric acid (electrolyte). Contact with skin or eyes may cause severe burns. Wear
protective clothing and a face shield. If electrolyte gets in your skin, flush with water; if gets in your eyes, flush
with water for at least 15 minutes and call a physician at once.
●Electrolyte is poisonous. If swallowed, drink large quantities of water or milk, and follow with milk of
magnesia or vegetable oil and call a physician.
●Keep out of reach of children.
Fig. 2

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CAUTION:
●Do not add tap water to the battery instead of distilled water, or the battery life will be shortened.
●Do not add distilled water over electrolyte upper level mark, or electrolyte will spill out to corrupt the
engine parts. If so, be sure to wash them away with water.
●Make sure not to connect the battery leads in reverse order, or short-circuit or breaker’s cutting may
occur.

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CONTROL CONNECTION OF REMOTE DISTANCE (OPTION)
Throttle and choke levers are designed with holes for optional cable accessories.
1. The diagram shows the installation method of single strand cable and woven cable.
a) Remote-controlled choke valve and Remote-controlled throttle valve.
Fig.3

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b) Remotely –controlled throttle valve and Manually-controlled choke valve
c) Manually-controlled throttle valve and Manually-controlled choke valve
2. Put the levers of both the choke and throttle on the controlled pedestal.
Fig. 4
Fig. 5

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PRE-OPERATE INSPECTION
Ⅰ. Engine oil
CAUTION:
●Engine oil is a key factor in deciding the engine’s performance. Do
not use engine oil with additives or 2-stroke gasoline engine oil, as they
haven’t enough lubrication, which may shorten the engines service life.
●Check the engine when it on a level ground.
Recommended engine oil: SAE10W-30
As viscosity varies with regions and temperatures, so the lubricant
has to be selected in accordance with our recommendation.
CAUTION:
Use cleanser-free oil or two-stroke engine oil will shorten the machine’s life.
Check steps：
1）Ensure that the engine is stops on a level ground.
2）Remove the dipstick (Fig.7) and clean it.
3）Reinsert the dipstick into the oil filler without screwing it,
and check oil height.
Fig. 6
Fig. 7

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Fig.8
4）if the oil level is too low, fill the recommended oil to the upper level mark.
5）Reinstall oil plug and dipstick.
CAUTION:
1. Run with insufficient engine oil may severe damage the engine.
2. Please stop the engine and check it on ground level.
Ⅱ.Air cleaner
Dismantle the air cleaner cover (Fig. 8), and check its filter element, make sure it clean and intact. Otherwise clean
or replace it.

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CAUTION:
1. Do not allow the engine in operation without air cleaner, or it will speedup its abrasion.
2. Keep dust and fragment out of the air cleaner housing.
Ⅲ. Fuel and fuel tank
The engine must apply unleaded gasoline with an octane number over 86.
Using unleaded gasoline will decrease the possibility of producing carbon deposit and will prolong the engine’s
service life.
Never apply used or polluted gasoline or a mixture of gasoline with engine oil. Make sure the fuel is free of dirt
and water

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STARTING THE ENGINE
CAUTION:
PPE devices (ear protection, gloves) should be used before start the engine.
1. Push the fuel cock to “ ON ”.（Fig.9）（Option）
2. Push the choke lever to “ CLOSE ”.（Fig.10）。
3. Push the throttle to “FAST”slowly.
4. Start the engine as follows:
a). Hand-operated kick-starter
Pull slightly the starting rope handle up until feeling anti-action, and then
make a rapid pull.
CAUTION:
Releasing the handle suddenly may make it hitting the engine. Release
the handle slowly conforming with its recoiling force.
Fig. 9
Fig.11
Fig.10
Fig.12

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b) Electric starter
Push the engine switch to “START”and keep 5 seconds to make it start.
CAUTION:
Use the engine switch not than 5 minutes each time to avoid damage of the engine. Try again 10 seconds later
after last attempt failures. Once engine starts, push the engine switch to “ON”.
Fig.13

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RUNNING THE ENGINE
1. If the engine stars when the choke knob “CLOSE”, please push it to “ON”immediately after the engine runs
smoothly.
2. Set the throttle lever in proper position to ensure the engine runs at required velocity.
Ⅰ. Engine oil alarm
The engine oil alarm is designed to function when the engine oil in the crankcase is insufficient. Lack of engine oil
may damage the engine. Once oil level in the crankcase is too low, the engine oil alarm will stop the engine
automatically to make it free of damage while the engine switch is still at “ON ”.
Fig. 14
Fig. 15

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CAUTION:
If cannot restart the engine, check the engine oil level first before go to other check items.
Ⅱ.Breaker
The breaker which protect the charging circuit of the battery will cut off automatically in the case that short circuit
or incorrect connection of the battery poles occurs.
The green indicator in the breaker will jump out with the circuit cutting off. After finding troubles and
troubleshooting, depress the breaker button to turn the breaker on.
Ⅲ. Operating on highlands
On highlands, the standard mixture ratio is relatively too big so the engine performance may be impaired while the
fuel consumption may increase, besides, too big mixture ratio will pollute the spark plug and result in starting the
engine difficultly. This problem can be solved by amending the carburetor technological status. If always using on
highlands with at 1800 meters above sea level, ask your dealer for help.
However, the engine power will decrease by about 3.5% with every 305 meters up in height.
CAUTION:
Amended engine applicable to highlands may be damaged seriously in area below altitude of 1800 meters for
overheating, because its mixture ratio is too small for operation in low altitude area. In the case, ask your dealer to
recover the engine to its normal technical status.

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STOP
In an emergency, push the engine switch to “OFF” to stall the engine. Normally, stop it in the following steps:
1. Push the throttle lever to (SLOW) slowly. (Fig. 16)
2. Push the engine switch to “ OFF ”.（Fig.17）。
3. Set the fuel cock to “ OFF ”.（Fig.18）。（Option）
CAUTION:
Never sudden stopping at high speed with heavy load is, otherwise it will damage the engine.
Fig. 16
图17
Fig. 18

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EXHAUST CONTROL SYSTEM
When the engine running, carbon monoxide, oxide of nitrogen and hydrocarbon will produce, and in certain
conditions, oxide of nitrogen and hydrocarbon will react chemically each other to make smoke while carbon monoxide
is toxic, so exhaust control of them is very important. The company decreases the exhaust emissions by introducing
poor-fuel carburetors and other devices into the engine to solve the problem.
To meet the exhaust with in the standard exhaust emission, pay attention to the following:
1.Maintenance
Maintain the engine periodically in accordance with the maintenance schedule in the manual. The maintenance
schedule is made out on the base of normal use in normal conditions, if using under heavy load, dusty or wet
circumstances or in high temperature, service of the engine should be done more often.
2.Replacement of parts
We recommend that you should choose the parts which are manufactured by our company or equivalent to these in
quality as replacement ones. Replacement without so high quality as the original may impair the exhaust control system
in effectiveness.
3.Modifying
Modifying the exhaust control system may make actual exhaust emissions exceeding statutory limit values. Illegal
modification as such: