Hyundai HYBCF31 is a versatile and powerful tool designed for various gardening tasks. It combines the functionality of a grass trimmer and a brushcutter, allowing you to tackle overgrown grass, weeds, and woody vegetation with ease. Powered by a reliable 31cc, 4-stroke engine, this machine delivers efficient cutting performance while minimizing fuel consumption and emissions.
Hyundai HYBCF31 is a versatile and powerful tool designed for various gardening tasks. It combines the functionality of a grass trimmer and a brushcutter, allowing you to tackle overgrown grass, weeds, and woody vegetation with ease. Powered by a reliable 31cc, 4-stroke engine, this machine delivers efficient cutting performance while minimizing fuel consumption and emissions.
4 STROKE GRASS TRIMMER &
BRUSHCUTTER
M
odel HYBCF31
User Manual
Page 2
CONTENTS
1. SAFETY
4 - 8
2. SPECIFICATION
9
3. PARTS LOCATIONS
10
4. ASSEMBLY
11 – 12
5. OPERATION
13 – 17
6. MAINTENANCE
17 – 20
7. TROUBLESHOOTING
21
8. STORAGE
22
9. DISPOSAL
22
10. DECLARATION of CONFORMITY
23
Page 3
1. SAFETY
1.1. The operator of the machine is responsible for and has a duty of care in making sure
that the machine is operated safely and in accordance with the instructions in this
user manual. Please note the following safety points.
1.2. The machine should never be left it in a condition which would allow an untrained
or unauthorised person/s to operate this machine.
1.2.1. All due care and diligence should be taken by the operator for the safety of
and with regard to those around whilst using the machine.
1.2.2. Some or all of the following PPE, Warning Signs and symbols may appear
throughout this manual and you must adhere to their warning/s. Failure to do
so may result in personal injury.
Personal Protective Equipment (PPE)
FOLLOW safety messages to avoid or reduce risk of injury or death.
DANGER - indicates a
hazard, which, if not
avoided, could result
in
serious injury or
death.
WARNING - indicates a
hazard, which, if not
avoided, could result in
serious injury or death.
CAUTION - indicates a
hazard which, if not
avoided, might result
in minor or moderate
injury.
NOTE - indicates a
situation that could
easily
result in
equipment
damage.
READ MANUAL
Read and
understand
these
instructions
before use.
Helmet, goggles
and ear
protection.
Wear anti-slip
safety footwear.
Wear safety
gloves.
Beware of
thrown objects.
Warning -
Attention
Keep all children, bystanders and helpers 15 meters from
the machine.
1.3. Carbon monoxide.
1.3.1. Carbon monoxide is a colourless and odourless gas. Inhaling this gas can
cause
death as well as serious long term health problems such as brain damage.
1.3.2. The symptoms of carbon monoxide poisoning can include but not limited to
Page 4
the
following;
1.3.2.1. Headaches, dizziness, nausea, breathlessness, collapsing or loss
of consciousness.
1.3.2.2. Carbon monoxide symptoms are similar to flu, food poisoning, viral
infections and simply tiredness. It is quite common for people to mistake
this very dangerous poisoning for something else.
1.3.3. To avoid carbon monoxide poisoning DO NOT use Petrol/Diesel powered
equipment inside a home, garage, tent, camper van, mobile home, caravan or
boat. The list is not exhaustive if you are in any doubt contact your dealer.
1.3.4. If you think you or someone around you has been affected by carbon
monoxide
poisoning;
1.3.4.1. Get fresh air immediately, by opening doors and windows, turning off
the
machine and leaving the affected area.
1.3.4.2. See your doctor immediately or go to hospital - let them know that
you suspect carbon monoxide poisoning.
1.3.5. DO NOT use in an enclosed area or a moving vehicle.
1.4. General fuel safety.
1.4.1. Fuel Safety additional information can be obtained from the Health and
Safety Executive.
1.4.2. All fuels are flammable.
1.4.3. Keep away from all ignition sources i.e. heaters, lamps, sparks from grinding
or welding.
1.4.4. Hot work on tanks that have contained fuel is extremely dangerous and
should not be carried out.
1.4.5. Keep work area clean and tidy.
1.4.6. Clean up all spills promptly using correct methods i.e. absorbent granules and
a lidded bin.
1.4.7. Dispose of waste fuels correctly.
Page 5
1.5. Petrol safety.
1.5.1. Always fuel and defuel in well-ventilated area.
1.5.2. Always wear correct, suitable and fit for purpose Personal Protective
Equipment (PPE), suggested items are as follows, but are not limited too.
1.5.3. Respiratory protective equipment should be used when in an unventilated
area.
1.5.4. When defueling always use a propriety fuel retriever.
1.5.5. Always carry fuel in the correct and clearly marked container.
1.6. Vibrations.
1.6.1. Prolonged use of the machine sets the user from vibrations, which can lead
to white finger (Raynaud's phenomenon) or carpal tunnel syndrome. This
condition reduces the ability of the hand to feel and regulate temperature,
causing numbness and heat sensations and may cause nerve damage and
circulatory tissue death.
1.6.2. Not all factors that lead to white finger disease are known, but cold weather,
smoking and other diseases that affect blood vessels and blood circulation as
well as large and long-lasting impact of shocks are considered factors called in
the formation of white finger. Note the following to reduce the risk the white
finger and carpal tunnel syndrome to reduce:
1.6.2.1. Wear gloves and keep your hands warm
1.6.2.2. Take regular breaks
1.6.3. All of the above precautions can reduce the risk of white finger disease but
not rule out carpal tunnel syndrome. Long-term and regular users are therefore
recommended to observe the condition of your hands and fingers. Seek
medical attention immediately if any of the above symptoms should occur.
1.7. Noise.
1.7.1. The operating noise of the machine can damage your hearing. Wear hearing
protection such as earplugs or ear defenders to protect your hearing. Long-
term and regular users are advised to have hearing checked regularly. Be
especially vigilant and cautious when wearing hearing protection because your
ability to hear shouted and alarm warnings will be reduced.
1.7.2. Noise emissions for this equipment is unavoidable. Carry out noisy work at
approved times and for certain periods. Limit the working time to a minimum.
For your personal protection and protection of people working nearby it is
advisable for them to wear hearing protection.
1.8. Additional safety guidelines.
1.8.1. This machine may only be used for trimming grass, weeds and brushwood.
Never use for other purposes, as this may result in serious injury! Safety
instructions must be observed. DO NOT EXPOSE YOURSELF OR OTHERS TO THE
RISKS. Follow these general instructions:
Page 6
1.8.2. Always wear safety goggles for eye protection. Long hair must be tied back.
Do not wear loose clothing or jewellery that could get caught in moving parts of
the machine. Safe, strong, non-slip safety shoes should be worn. It is
recommended that the legs and feet are fully protected, to protect themselves
during the operation against flying objects.
1.8.3. Check the entire machine for loose/missing parts (nuts, bolts, screws, etc.).
Tighten/ replace before using the machine. Do not use accessories with this
machine other than those recommended/supplied by the manufacturer.
Otherwise serious injuries to the user or bystanders as well as damage to the
machine will result.
1.8.4. Keep the handles free of oil and fuel.
1.8.5. Always use the correct interface handles and shoulder strap.
1.8.6. Do not smoke when mixing fuel or when filling the tank.
1.8.7. Do not mix fuel in an enclosed area or near open fires. Ensure sufficient
ventilation / ventilation.
1.8.8. Mix and store the fuel mixture in a correctly marked container, which is
allowed by local regulations for such use.
1.8.9. Never remove the fuel tank cap while the engine is running.
1.8.10. Do not operate the machine in enclosed spaces or buildings. Exhaust gases
contain harmful carbon monoxide.
1.8.11. Do not run and whilst using the machine. When making machine adjustments
turn it off and lace the machine always on a flat clear surface.
1.8.12. Do not use the machine if it is damaged. Never remove safety devices of the
machine. Otherwise it may result in serious injury to the operator or the
spectator, and damage to the machine will result.
1.8.13. Check the area to be cut, and remove any residue that may be involved in the
nylon cutting head or blade. Remove all possible items that could fling around
when the engine works.
1.8.14. Never leave the machine unattended.
1.8.15. Do not bend over far forward. Maintain proper footing and
1.8.16. balance Do not use the machine while standing on a ladder or on any other
unstable surface.
1.8.17. Children must not have access to the machine.
1.8.18. Spectators should be kept at a safe distance from the work area, and at least
15 meters.
1.8.19. Keep hands and feet away from the nylon cutting head or metal blade during
operation.
1.8.20. Do not use the machine if you are tired, ill or under the influence of
medication, drugs or alcohol.
1.8.21. Only use an undamaged nylon cutting head. If you strike a rock or other
obstacle, stop the engine and check the cutting head. A defective or un-
balanced cutting head must never be used.
1.8.22. Before starting, after the failure or impact, make sure to check the machine
and make sure that it is in good condition.
1.8.23. Observe local regulations which may restrict the use of the machine.
1.8.24. Only use device with the cutting tool still in good condition.
Page 7
1.8.25. Improper maintenance, or the use of non-compliant spare parts or removal
or modification of the safety devices can result in damage to the unit and
serious injury of so working person.
1.8.26. Secure unit during transport well to prevent loss of fuel, damage to the unit
and injury. Always install the protective part of the cutting blade before
transporting or storing the machine.
1.8.27. On machines with a clutch, you should check regularly that the cutting
accessory stops rotating when the engine is idling.
1.8.28. Check the machine before each use for loose fasteners, fuel leaks, etc.
Replace damaged parts damaged parts before use.
1.8.29. It is also necessary to have sufficient breaks and to change your working
position.
1.8.30. Do not store the machine in a closed area where fuel vapours as may reach
an open flame from hot water heaters, ovens, etc. Store the machine only in a
well-ventilated area.
When filling with fuel, make sure the engine is off and cooled. Never
refuel if the machine is running or is hot. If fuel is spilled, wipe on this
before you start the engine.
Page 8
2. SPECIFICATION
MODEL
HYBCF31
Engine Type
1E139F - Air cooled, four stroke, single cylinder petrol
engine
Engine Size cc
31
Oil Capacity ml
310
Fuel tank capacity ml
600
Noise Level dB
113
Rated Speed rpm
6000
Rated Power kw
0.7
Drive Type
Direct
Start Method
Recoil
Clutch type
Centrifugal type
Rotation direction
Counter-clockwise (viewed from top)
Fuel Ratio/Fuel Type
Unleaded regular
Cutter head
Brush Cutter: 255mm, Grass Trimmer: 430mm
Cutter blade mm/teeth
1.6 /3
Cutting Width mm /Length mm
/Diameter mm
255 Brush cutter/430 grass trimmer
Gross Weight kg
8.5
Dry Weight kg
7.0
Fully Assembled Dimensions L x W x H
mm
1820 x 750 x 500
Extensions mm/kg
N/A
Box Dimensions L x W x H mm
1070 x 300/105 x 295
Page 9
3. PARTS LOCATIONS
1. Recoil starter handle
2. Choke lever
3. Air filter cover
4. Spark plug
5. Harness hook
6. Throttle trigger
lockout
7. Engine switch
8. Throttle
9. Gear box
10. Spool/Cord assembly
11. Cutting guard
12. Cord cutter blade
13. Shaft
14. Handlebar
15. Fuel tank
Page 10
4. ASSEMBLY
DO NOT carry out any kind of assembly or maintenance work unless the
machine is turned off and allowed to cool down
4.1. Handle assembly.
4.1.1. Undo knob (Fig 1), undo cover and place the handle onto the cradle (Fig 2)
onto the upper shaft.
4.1.2. Tighten the handle knob (Fig 3).
DO NOT fully tighten the knob until you have set the handle in an
optimal working position. Adjust position with the machine
accessories fully assembled.
4.2. Cutting guard assembly. (Fig 4).
4.2.1. Loosen the 4 screws on the fixed supporter
bar with the supplied allen key.
4.2.2. Place the cutting guard attachment to the
fixed supporter.
4.2.3. Use the screws to secure the cutting guard
to the fixed supporter bar.
Please check the blade/spool and output shaft before each adjustment
and assembly to make sure they all run smoothly.
4.3. Blade assembly. (Fig 5 & 6).
DO NOT used unapproved blades. Using the incorrect blade may cause
serious injury.
4.3.1. Insert the allen key into the semi-circular opening
on the back side of head to shaft form turning.
4.3.2. Undo the securing nut using supplied box spanner.
4.3.3. Fit the blade onto the shaft then assemble the
flange, cap and nut.
Page 11
4.3.4. Fasten the nut – remember to keep shaft from rotating as in 4.3.1.
4.3.5. Remove the allen key.
4.4. Trimmer head trimmer assembly. (Fig 5, 6 & 7).
DO NOT used trimmer heads. Using the incorrect trimmer head may
cause serious injury.
4.4.1. Insert the allen key into the semi-circular opening
on the back side of head to shaft form turning.
4.4.2. Undo the securing nut using supplied box spanner.
4.4.3. Screw the trimmer spool onto the thread of the
output shaft in an clockwise direction viewed from
above.
4.4.4. Remove the allen key.
4.4.5. To replace the edge trimmer assembly reverse steps 4.1.1 to 4.4.4.
Page 12
5. OPERATION
5.1. Before operation.
ALWAYS read the instruction manual carefully and fully check the
machine before each use.
Oil is removed before leaving the factory so you MUST make sure that
the machine has oil before starting.
Check the cutting attachments to make sure that they are not blunt,
cracked or damaged.
You must make sure that the handle and safety features are in working
order.
NEVER use a machine with parts missing or broken.
All safety covers must be properly fitted.
ALWAYS wear personal protective clothing that comply with current
regulations,
5.1.1. Checking the engine oil.
5.1.1.1. Before starting the machine, ensure the crank case is filled to the top
of the neck with either SAE30 or a 4 stroke oil.
5.1.1.2. Before checking or refilling with oil, make sure the machine is put on
level ground.
5.1.1.3. Make sure the machine is switched off by turning the engine switch to
the OFF position.
5.1.1.4. Remove the engine oil cap by rotating the cap anti-clockwise.
5.1.1.5. If the oil level is below the top of the oil tank or either 10w30 or
15w40 4 stroke oil.
5.1.1.6. Screw in the engine oil cap.
During use the oil will become discoloured and/or contaminated, Make
sure that the oil is checked and changed on a regular basis.
5.1.2. Engine fuel.
The brush if fitted with a 4-Stroke engine. YOU MUST use straight
unleaded petrol. DO NOT mix with oil.
5.1.2.1. Only fuel the machine in well-lit areas. Avoid fuel spillage. Never
refuel the machine during operation. Let engine cool down for about two
minutes before refuelling. Refuelling must not be carried out near naked
flames, control lamps or spark producing electrical equipment such as
electric tools, welders or sanders.
5.1.2.2. Make sure the machine is turned off by turning the engine switch to
the “OFF” position.
5.1.2.3. Check the fuel by a visual check , remove the fuel cap and reviewing
the fuel level.
Page 13
5.1.2.4. Fill with unleaded fuel from an approved fuel container into the fuel
tank, because fuel expands, please fill the tank to the bottom of the neck
of tank only.
5.1.2.5. Turn the fuel cap clockwise to tighten it.
DO NOT refuel while the engine is running or HOT!
MAKE sure that fuel is not leaking from the rear outlet tube of fuel
drain hole.
5.1.2.6. NEVER use old or dirty petrol or oil/petrol mixtures. Avoid
contamination with dirt or water in the tank. Occasionally ignition
knocking or clanging can be heard with high loads. This is normal and no
cause for alarm. If ignition knocking or clanging occurs during normal loads
and with constant motor speed you should change the petrol quality. If
this does not solve the problem contact an authorised dealer. When
working at continuous high revs a higher octane fuel rating is
recommended.
5.1.3. Checking the air filter.
5.1.3.1. Check the air filter to be sure it is clean and in good condition.
5.1.3.1.1. Loosen the air filter cover screw, remove the air filter element,
clean or replace as required.
5.1.4. Starting the engine.
The cutting attachment may start to move when the engine is started.
Make sure that the attachment does not come into contact with any
object.
Make sure that no unauthorised persons are in the working area,
otherwise there is a risk of serious personal injury.
5.1.4.1. Press the intake pump several times until the fuel begins to fill the
bulb.
5.1.4.2. Turn the engine switch to the” ON “position.
5.1.4.3. To start a cold engine, move the choke lever to the
START position. To restart a warm engine, leave the choke
lever in the run position.
5.1.4.4. To start the engine, the throttle trigger
should be locked in idling position. To do so,
follow the steps below:
5.1.4.5. Press the throttle trigger lockout (2).
5.1.4.6. Maintaining the throttle trigger lockout
engaged, press the throttle trigger (3).
5.1.4.7. push the throttle lock (1).
5.1.4.8. The throttle lock (1) should remain in the
down position.
Page 14
5.1.4.9. Then release the throttle trigger lockout and throttle trigger, the
throttle should remain in the ‘start’ position.
5.1.4.10. Slowly pull the recoil starter until you feel it engage and then pull it
quickly. Return the recoil Starting gently to the original position by hand.
Note: when the engine is started for the very first time. It may require
a number of attempts to start until the fuel has travelled from the
tank to the motor.
5.1.4.11. Turn the choke lever to the ‘run’ positon after the engine has started.
5.1.4.12. After starting the engine, press the throttle trigger to release the
throttle trigger lockout. Let the engine run for 2 to 3 minutes so that it
warms up before subjecting it to any load.
Check that the cutting blade or spool always comes to a stop when
the engine is idling.
5.1.5. STOP Using the machine if any of the following occur.
5.1.5.1. The engine speed changes with no control.
5.1.5.2. Sparks occur.
5.1.5.3. When blades are damaged
5.1.5.4. In case of misfire
5.1.5.5. In case of high vibration.
5.1.5.6. When flames or smoke appear.
5.1.5.7. In rain or stormy weather.
5.1.6. Wearing the harness.
5.1.6.1. Wear the harness shown in (G1-G3).
5.1.6.2. Hook the machine to the carrying belt (G4).
5.1.6.3. Adjust the perfect working and cutting position by using the various
strap adjusters on the carrying strap (G5).
5.1.6.4. In order to set the optimum length of the carrying strap, the user
should then make a test without starting the engine.
Page 15
IMPORTANT: The carrying strap is fitted with a
quick-release mechanism. Pull the Red strap
section (shown inside circle - G6) if you need to
remove the strap quickly.
IMPORTANT: Always use the harness when
working with the machine. Attach the strap as
soon as you have started the engine and it is
running in idle mode.
5.2. Cutting.
5.2.1. During cutting, please don’t keep the running speed just above clutch
engagement speed. Any prolonged use at low speed is likely to cause
premature wear of the clutch due to excessive clutch slippage.
5.2.2. On the other hand, the user should not keep the engine speed at maximum
speed after cutting. Any prolonged use at the highest speed is likely to reduce
lifespan of engine.
5.2.3. Cut the grass from right to left.
5.2.4. Always take care to maintain a well-balanced and secure position.
5.2.5. Wear the harness as illustrated in the figure G1 to 6. The blade turns anti-
clockwise, so it is advised to use the unit from right to left to make an effective
cut. Make sure that any people present are at least 15 meters away from the
working area.
In an emergency, stop the engine by moving the engine switch to the
stop position.
If the cutter accessory strikes stone or other debris, stop the engine
and check whether something has been damaged and the cutter
attachment is still secure.
If wet grass or branches remain in the cutter attachment, stop the
engine and remove them.
5.3. Kickback and Related Warnings
5.3.1. Kickback is a sudden reaction to a pinched or snagged rotating blade.
Pinching or snagging causes rapid stalling of the rotating blade which in turn
causes the uncontrolled power tool to be forced in the direction opposite of the
accessory’s rotation at the point of the binding.
5.3.2. For example, if a blade is snagged or pinched by the stone, the edge of the
blade that is entering into the pinch point can dig into the surface of the
Page 16
material causing the blade to climb out or kick out. The blade may either jump
toward or away from the operator, depending on direction of the blade’s
movement at the point of pinching.
5.3.3. Kickback is the result of power tool misuse and/or incorrect operating
procedures or conditions and can be avoided by taking proper precautions as
given below:
5.3.3.1. Maintain a firm grip on the power tool and position your body and
arm to allow you to resist kickback forces. Always use auxiliary handle, if
provided, for maximum control over kickback or torque reaction during
start-up. The operator can control torque reactions or kickback forces, if
proper precautions are taken.
5.3.3.2. Never place your hand near the rotating blade. The blade may
kickback over your hand.
5.3.3.3. Do not position your body in the area where power tool will move if
kickback occurs. Kickback will propel the tool in direction opposite to the
blade’s movement at the point of snagging.
5.3.3.4. Use special care when working corners, sharp edges etc. Avoid
bouncing and snagging the accessory. Corners, sharp edges or bouncing
have a tendency to snag the rotating blade and cause loss of control or
kickback.
5.4. Extending the cutting line
5.4.1. To extend the cutting line run the motor at full
speed and tap the cutting head on the ground.
This will automatically extend the line. The cord
cutter (item 12 part location drawing) under the
cutting attachment guard (item 11 part location
drawing) will cut the line to the appropriate
length.
5.5. Stopping the engine.
5.5.1. Reduce the engine speed and let it run with no load for a few minutes.
5.5.2. Switch OFF the engine switch to the stop position.
5.5.3. The blade may cause an accident if it continues to turn after the engine has
stopped or after the engine switch has been released. When the unit has
stopped, check carefully that the blade has stopped turning before putting the
unit down.
6. MAINTENANCE
6.1. Good maintenance is essential for safe, economical and trouble-free operation.
6.1.1. It will also help reduce air pollution.
6.1.2. The purpose of the maintenance and adjustment schedule is to keep the
machine in the best operating condition.
6.1.3. If the engine must be run make sure the area is well ventilated. The exhaust
contains poisonous carbon monoxide gas Please always select recommended
accessories.
Page 17
6.1.4. The accessories which have not equivalent quality may damage the machine.
6.1.5. Please never use non approved components and remove the safety devices
after or during maintenance.
Maintenance
Daily
Weekly
Monthly
Clean the outside of the machine.
*
Make sure the throttle trigger lock
and the throttle Function correctly
from a safety point of view.
*
Check that the engine switch works correctly.
*
Check that the blades do not move when the
engine
is idling or when the choke is in the
start throttle position.
*
Check that the blades are undamaged
and show no signs of cracking or other
damage. Replace the blades if
necessary.
*
Check that the blade guard is not damaged
or
distorted. Replace the blade guard if it is
bent or damaged.
*
Check that there are no fuel leaks from the
engine, tank or fuel lines.
*
Check that nuts and screws are tight.
*
C heck the starter and starter cord.
*
Clean the outside of the spark plug.
Remove it and check the electrode gap.
Adjust the gap to 0.6 to 0.7 mm or replace
the plug. Check that the spark plug is fitted
with a spark plug cap.
*
Clean the machine’s cooling system.
*
Clean the outside of the carburettor and the
space around it.
*
Check the flange, cap and nut are assembled
correctly and tightened
*
Clean the fuel tank.
*
Check all cables and connections.
*
Check the clutch, clutch springs and the
clutch drum for wear. Replace if necessary
by an authorized service workshop.
*
Replace the spark plug. Check that the
spark plug is fitted with a spark plug cap.
*
To reduce the fire hazard, clean dirt, leaves
and surplus lubricant, etc. from the muffler
and engine.
*
Page 18
MAINTENANCE should be carried out
at REGULAR INTERVALS in each of
the indicated months or after a certain
number of hours of operation
(Whichever comes first). (see notes 1 & 2)
Before each
use
Monthly or
after every
25
Every three
months or 50
hours
Every six
months or
after 100
hours
Engine oil
Change
*
* (1)
Air filter
Clean
* (1)
Valve-clearance
Check/Clean
* (2)
Fuel tank and filter
Clean
* (2)
Fuel feed line
Check replace if
necessary
Every three years (2)
(1) If operated in dusty areas carry out maintenance more frequently.
(2) A specialist technician should carry out this maintenance if the owner does not have
the appropriate tools or mechanical knowledge.
6.2. Air filter.
6.2.1. Loosen the air filter cover screw and remove the air
filter cover.
6.2.2. Wash the air filter in solvent.
6.2.3. Put a drop of oil onto filter and thoroughly squeeze (DO
NOT wring) the filter to remove oil.
6.2.4. Re-install the air filter.
6.2.5. Refit the air filter cover and fully tighten the cover
screw.
6.3. Spark plug.
6.3.1. To make sure that the engine operates properly, the spark plug must be
properly gapped and free of deposits.
6.3.1.1. Remove the spark plug cover from the housing.
6.3.1.2. Remove the spark plug cap.
6.3.1.3. Clean any dirt from around the spark plug base.
6.3.1.4. Use the socket spanner which provided to remove the spark plug.
6.3.1.5. Visually inspect the spark plug. Remo ve carbon deposits using a wire
brush.
6.3.1.6. Check for discolouration on the top of the spark plug. The standard
colour should be a tan colour.
6.3.1.7. Check the spark plug gap. The acceptable gap
should be between 0.6mm-0.7mm.
6.3.1.8. Install /reinstall the spark plug carefully by
hand.
6.3.1.9. Once the spark plug has been seated, tighten
it with a spark plug wrench.
6.3.1.10. Reinstall the spark plug cap on top of the
spark plug.
6.3.1.11. Reinstall the spark plug cover.
Page 19
6.4. Cleaning.
6.4.1. Keep your machine clean, the outside of the machine can be cleaned using a
damp soft cloth with a mild detergent if required, never use water to clean
the machine as it may cause damage to internal parts.
6.4.2. Some maintenance products and solvents may damage the plastic parts,
these include products containing benzene, chloride and ammonia.
6.4.3. Take special care to keep the ventilation inlets/outlets free from obstruction.
Cleaning with a soft
6.4.4. brush followed by a compressed air jet will usually be sufficient to ensure
acceptable internal cleanliness.
6.4.5. Wear eye protection when carrying out cleaning.
6.5. Adjusting the carburetor.
6.5.1. The carburetor governs the engine’s speed via the throttle control. Air and
fuel are mixed in the carburettor. The air/fuel mixture is adjustable. Correct
adjustment is essential to get the best performance from the machine.
6.5.2. Adjusting the carburettor means that the engine is adapted to local operating
conditions, e.g. climate, altitude, petrol and the type of 2-stroke oil.
6.5.3. The engine has been tested in the factory with initial adjustment. The
user need not adjust the carburettor.
6.5.4. To ensure that it continues to run at peak performance and to minimise
harmful exhaust emissions after the running-in period, please always contact
the authorised service to adjust the carburettor.
6.6. Adjusting the idle speed.
6.6.1. A screw just behind air filter cover regulates the
throttle setting at idle speed. The user can adjust the
idle speed, if it’s necessary.
6.6.2. Before and adjustment, make sure that the air filter is
clean and the air filter cover is fitted
6.6.3. Turn the screw clockwise can give a higher idle speed;
turning it anti-clockwise gives a lower idle speed.
6.6.4. The idle speed is correctly adjusted when the engine runs smoothly in every
position. There should also be a clear margin to the speed at which the blades
start to move. The blades must also remain stationary when the choke control
is in the start throttle position.
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Hyundai HYBCF31 is a versatile and powerful tool designed for various gardening tasks. It combines the functionality of a grass trimmer and a brushcutter, allowing you to tackle overgrown grass, weeds, and woody vegetation with ease. Powered by a reliable 31cc, 4-stroke engine, this machine delivers efficient cutting performance while minimizing fuel consumption and emissions.
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