HYOSUNG GV125S User manual

—1 —
This manual should be considered a permanent
part of the motorcycle and should remain with the
motorcycle when resold or otherwise transferred to
a new owner or operator. The manual contains
important safety information and instructions which
should be read carefully before operating the
motorcycle.

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1. BATTERY INITIALCHARGING
Initial charging of the battery is required after filling electrolyte to
improve the battery durability.
2. BATTERYINSTALLATION
①Fill the electrolyte to the battery.
②Leave the battery for 30 minutes.
③Charge the batterybystandard charging. This is necessaryfor
reliability of the battery.
④Install the battery to the motorcycle.
※STANDARD CHARGING TIME : 1.0 A for 10 hours
Do not use the battery without the battery initial charging.
Otherwisethebatteryservicelifemaybeshortened.
The motorcycle use a battery ignition system.
Do not permit to start or operate the motorcycle without the
battery otherwise the electrical system will be damage.
Always start or ride the motorcycle with the correct battery
installed and connected.
BATTERY INITIAL CHARGING

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FOREWORD
Thank you for choosing a Hyosung motorcycle. We at
Hyosung have designed, tested and produced this
motorcycle using the most modern technology avail- able to
provide you with much happy, enjoyable, safe riding.
Motorcycling is one of the most exhilarating sports and to
ensure your riding enjoyment, you should become thoroughly
familiar with the information presented in this Owner's
Manual before riding the motorcycle.
The proper care and maintenance that your motorcycle
requires is out- lined in this manual.
By following these instructions explicitly you will ensure a
long trouble-free operating life for your motorcycle. Your
dealer has experienced technicians that are trained to
provide your machine with the best possible service with the
right tools and equipment.
Operative norm:
Q/370100JQH002—2018

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All information, illustrations photographs and specifications
contained in this manual are based on the latest product
information available at the time of publication. Due to
improvements or other changes, there may be some
discrepancies between information in this manual and your
motorcycle.
Hyosung reserves the right to make changes at any time,
without notice and without incurring any obligation to make
the same or similar changes to motorcycles previously built
or sold.
Please note that this manual applies to all specifications for
all respective destinations and explains all equipments.
Therefore, your model may have different standard features
than shown in this manual.
ⒸCOPYRIGHT KR Motors Co., Ltd.

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IMPORTANT
BREAK-IN INFORMATION
FOR YOURMOTORCYCLE
The first 1,600 km (1,000 miles)
are the most important in the life
of your motorcycle.
Proper break-in operation
during this time will help ensure
maximum life and performance
fromyournew motorcycle.
Hyosung parts are
manufactured of high quality
materials, and manu factured
parts are finished to close
tolerances. Proper break-in
opera tion allows the machined
surfacesto polish each other and
matesmooth ly.
Motorcycle reliability and
performance dependonspecial
care and restraint exercise
duringthebreak- in period. It is
especially important that you
avoid operating the engine in a
manner which could expose the
enginepartstoexcessiveheat.
Please refer to the BREAK-IN
section for specific break-in
recommen dations.
WARNING / CAUTION
/ NOTE
Please read this manual and
follow its instructions carefully.
To emphasize special
information t he words 『 W A
RNI NG 』 , 『 CAUTION 』 and
『 NOTE 』 have special
meanings.
Information following these
signal words should be carefully
reviewed.
The personal safety of the
rider may be involved.
Disregarding this information
could result in injury to the
rider.
These instructions point out
special service procedures or
precautions that must be
followed to avoid damaging
the machine.
N O T E
This provides special
information to make
maintenance easier or
important instructions clearer.

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Noise Control System (muffler assembly)
TAMPERING WITH NOISE CONTROL SYSTEM PROHIBITED
Owners are warned that the law may prohibit :
(a) The removal or rendering inoperative by any person
otherthan for the purpose of maintenance, repair or
replacement, of any device or element of design
incorporated into any new vehicle for the purpose of
noise control prior to its any sale or delivery to the
ultimate purchaser or while it is in use.
(b) Theuseofthevehicleaftersuchdeviceorelementof
design has been removed or rendered inoperative
byanyperson.
MAINTENANCE :
The exhaust system of this motorcycle requires no periodic
maintenance.
The engine should be adjusted to the manufacture’s
specifications and the spark plug should be kept in good
condition. Running the engine with incorrectly operating spark
plug or misadjusted fuel injection systemmaycausepermanent
damagetothecatalystand to the noise controlsystem.

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CONSUMER
INFORMATION
SAFE RIDING
RECOMMENDATION
FOR MOTORCYCLE
RIDERS
Motorcycleriding is great fun
and anexcitingsport.Motorcycle
riding also requires he/she to
takesome extra precautions to
ensurethe safetyoftheriderand
passenger.
These precautions are :
● Before first use of the
motorcycle read this owner’s
manual carefully to become
familiar with the motorcycle
features, and safety and
maintenance requirements.
Review all instructions,
requirements and warnings.
● Before the rider’s first use of
the motorcycle, make sure
that he / she is familiar with
thelocation and operation of
all controls, and has been
instructed in the proper
operationof themotor- cycle.
● For first use of the
motorcycle, find a level, open
area for the rider to use to
become familiar with the
operation of controls and the
operating and handling
characteristics of the
motorcycle.

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●
Before each use, perform
daily inspections with the
rider.
●
Specific items to check are
listed in the INSPECTION
BEFORE RIDING section on
page 58 of this owner’s
manual.
●
Make sure the rider wears a
helmet, eye protection, and
protective clothing (gloves,
leather or heavy cloth pants,
long sleeved shirt or jacket,
boots).
●
Permit use only by two
per-sons.
●
This motorcycle is designed
for use only by one rider and
one passenger.
●
Do not permit anyone to
operate the motorcycle
under the influence of
alcohol or otherdrugs. It may
cause damage to the
motorcycle and alter
handling characteristics.
●
Observe periodic
maintenance requirements.
Your authorized dealer is
trained and equipped to
perform this ser- vice.
●
Drain gasoline from the fuel
tank prior to transporting the
motorcycle.
●
Caution the rider and
others near the motorcycle
not to get close to or touch
any moving parts or any
heated areas such as the
engine and exhaust sys- tem.
Do not make any modifications
to the motorcycle .
Modifications may make
the motorcycle unsafe or
illegal in your state.
The motorcycle is equipped
with the side stand ignition
interlock sys- tem.
If the transmission is in
neutral or the side stand up,
you can only start the engine
by squeezing the clutch lever.
This side stand ignition
interlock system prevents the
motorcycle from being started
with side stand down.
Make sure that the side stand
ignition interlock system is
working properly before riding.

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The position lamp, meter
lamp, tail lamp and license
plate lamp on this
motorcycle always comes
on when the ignition switch
is turned to the “”
position.
The head lamp is always lit
when starting the engine.
● Donotruntheengine
indoors or where there is
little or no ventilation.
Exhaust gases contain
carbon monoxide, a
potentially lethal gas that
is colorless and odorless.
● Never leave the
motorcycle running while
unattended, even for a
short time.
Always open the throttle
gradually to prevent front
wheel lifting. Failure to
observe this precaution may
result in loss of control and an
accident.
Keep both hands on the
hand- grips at all times when
riding. Removing your hands
from the handgrips reduces
your ability to control the
motorcycle and could result in
anaccident.
While operating the
motorcycle, the rider should
keep both feet on thefootrests
at all times to avoid injuries
resulting from accidents.
Moving the rider’s feet from
the footrests reduces the
rider’s ability to control the
motorcycleandcouldleadtoan
accident.
When storing for long period :
1. Supplyenoughthefuelin
the fuel tank.
2. Remove the battery from
the motorcycle.
Do not turn the ignition switch
to its “ ” position or the
steering lock to “ ” position
or the engine stop switch to
its “ ” position while riding
themotorcycle.

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⊙WEAR A HELMET
Motorcycle safety
equipment starts with a
quality safety helmet. One
of the most serious
injuries that can happen is
a head injury. ALWAYS
wear a properly approved
helmet. You should also
wear a suitable eye
protection.
⊙RIDING APPAREL
Loose clothing can be
uncomfortable and unsafe
when riding a motorcycle.
Use good quality
motorcycle riding apparel
when riding your
motorcycle.
⊙INSPECTION BEFORE
RIDING
Review thoroughly the
instruct ions in the
“INSPECTION BEFORE
RIDING” section of this
manual.
Do not forget to perform an
entire safety inspection to
ensure the safety of the rider
and its passenger.
⊙FAMILIARIZE YOURSELF
WITH THE MOTORCYCLE
Your riding skill and
mechanical knowledge from
the foundation for safe riding
practices.
We suggest that you
practice riding your
motorcycle in a non-traffic
situation until you are
thoroughly familiar with your
machine and its controls.
Remember practice makes
perfect.

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⊙KNOW YOUR LIMITS
Ride within the boundaries
of your own skill at all
times. Knowing these limits
and staying within them will
help you to avoid accidents.
⊙BE EXTRA SAFETY
CONSCIOUS ON BAD
WEATHER DAYS
Riding on bad weather
days, especially wet ones,
requires extra caution.
Braking distances double on
a rainy day. Stay off of the
painted surface marks,
manhole covers and greasy
appearing areas as they can
be especially slippery. Use
extreme caution at railway
crossings and on metal
gratings and bridges.
Whenever you have a doubt
about road condition, slow
down!
ACCESSORY
INSTALLATION AND
PRECAUTION SAFETY
TIPS
There are a great variety of
accessories available to
Hyosung owners. Hyosung can
not have direct control over the
quality or suitability of
accessories you may wish to
purchase except genuineparts.
The addition of unsuitable
accessories can lead to unsafe
operating conditions. It is not
possible for Hyosung to test
each accessory on the market or
combinations of all the available
accessories, however, your dealer
can assist you in selecting quality
accessories and installing them
correctly.
Use extreme caution when
select ing and installing the
accessories for your Hyosung.
We have developed some
general guidelines which will
aid you whendeciding whether,
and how to equip your
motorcycle.

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Improper accessories or
modifications can make
your motorcycle unsafe and
can lead to an accident.
Never modify the
motorcycle with improper or
poorly installed
accessories. Follow all
instructions in this owner’s
manual regarding
accessories and
modifications.
Use genuine Hyosung
accessories or equivalent
designed and tested for
your motorcycle. Consult
your dealer if you have any
questions.
1. In case that additional
weight or aerodynamic
affecting accessories are
installed, they should be
mounted as low as possible,
as close to the motorcycle
and as near the center of
gravity as is feasible. The
mounting brackets and
other attachment hardware
should be carefully checked
to ensure that it provides for
a rigid, unmovable mount.
Weak mounts can allow the
shifting of the weight and
create a dangerous,
unstable condition.
2. Inspect for proper ground
clearance and bank angle.
An improperly mounted load
could critically reduce these
two safety factors. Also
determine that the “load”
does not interfere with the
operation of the suspension,
steering or other control
operations.
3. Accessories fitted to the
handle- bars or the front
fork area can create serious
stability problems. This
extra weight will cause the
motorcycle to be less
responsive to your steering
control. The weight may

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also cause oscillations in
the front end and lead to
instability problems.
Accessories added to the
machine should be as light
as possible and kept to a
minimum.
4. The motorcycle may be
affected by a lifting
condition or by an instability
in cross winds or when
being passed or passing
large vehicles. Improperly
mounted or poorly designed
accessories can result in an
unsafe riding condition,
therefore caution should be
used when selecting and
installing all accessories.
5. Certain accessories
displace the rider from his
or her normal riding position.
This limits the freedom of
movement of the rider and
may limit his or her control
ability.
6. Additional electrical
accessories may damage
the existing electrical
system. Severe overloads
may damage the wiring
harness or create a
dangerous situation due to
the loss of electrical power
during the operation of the
motorcycle.
7. When carrying a load on the
motorcycle, mount it as low
as possible and as close as
possible to the machine. An
improperly mounted load
can create a high center of
gravity which is very
dangerous and makes the
motorcycle difficult to
handle. The size of the
“load” can also affect the
aerodynamics and handling
of the motorcycle.
Balance the load between the
left and right side of the
motorcycleand fasten itsecurely.
MODIFICATION
Modification of the motorcycle,
or removal of original equipment
may render the vehicle unsafe or
illegal. Obey all applicable
equipment regulations in your
area.

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TABLE OFCONTENTS
1.SERIAL NUMBER LOCATION...............................................................13
2.NAMES OF EACH PARTS.......................................................................14
3. CONTROLS.................................................................................................17
IGNITION SWITCH
IGNITION KEY
INSTRUMENT PANEL
LEFT HANDLE SWITCHES
RIGHT HANDLE SWITCHES
REAR BRAKE PEDAL
GEAR LEVER
STAND
REAR SHOCK ABSORBER
4. FUEL AND OIL AND ANTIFREEZE RECOMMENDATION...... 30
FUEL
ENGINE OIL
ANTIFREEZE
5.RIDING TIPS................................................................................................41
STARTING THE ENGINE
STARTING OFF
USING THE TRANSMISSION
RIDING ON HILLS
STOPPING AND PARKING
6.BREAK-IN.....................................................................................................48
7.INSPECTION BEFORE RIDING............................................................50
8.PERIODIC MAINTENANCE....................................................................54

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9.INSPECTION AND MAINTENANCE....................................................58
TOOL
ENGINE OIL
FUEL HOSE
FUEL
ANTIFREEZE
RUBBER CAP OF CABLES
REAR-VIEW MIRROR
REFLECTOR
EXHAUST PIPE AND MUFFLER
FRONT AND REAR SUSPENSIONS
BATTERY
AIR CLEANER
SPARK PLUG
IDLING ADJUSTMENT
THROTTLE CABLE PLAY ADJUSTMENT
CLUTCH CABLE ADJUSTMENT
DRIVE CHAIN
BRAKES
TIRE
BULBS
10.TROUBLESHOOTING..........................................................................87
11. TRANSPORT ........................................................................................90
12.CLEANING PROCEDURE ....................................................................91
13.STORAGE PROCEDURE......................................................................94
14. PARAMETER LIST .................................................................................96
15.CIRCUIT DIAGRAM..................................................................................98

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The frame and/or engine serial
numbers are used to register the
motorcycle. They are also to
assist your dealer in terms of
ordering parts or referring to
specialservice information.
The frame number is also
known as the VIN or Vehicle
Identification Number.
The frame serial number is
stamped on the right side of the
steering head tube.
The engine serial number is
stamped on the right upside of
the crankcase assembly.
Metal nameplate is on the riser
pipe of chassis, showing the
main technical parameters,
manufacturer and date of
production of the motorcycle.
Please write down the numbers
in the box provided below for
your future reference.
Frame number :
Engine number :
SERIAL NUMBER
LOCATION

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Handle bar instrument
1
Left handle switches
6
Front brake fluid reservoir
2
Clutch lever
7
Front brake lever
3
Rear-view mirror
8
Throttle grip
4
Instrument panel
9
Right handle switches
5
Ignition switch
10
Fuel tank cap
NAMES OF EACH PARTS

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Left side view
11
Head lamp & Position lamp
19
Rear turn signal lamp
12
Front turn signal lamp
20
Drive chain
13
Exhaust bolt
21
Passenger footrests
14
Ignition coil (Front and rear)
22
Side stand
15
ECU fuse box
23
Footrests
16
Battery
24
Gearshift lever
17
Seat
25
Spark plug (Front)
18
Brake / Tail lamp
26
Front brake disk

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Right side view
27
Rear brake disk
34
Engine oil filter
28
Spark plug (Rear)
35
Engine oil level lens
29
Air cleaner element
36
Engine oil drain bolt
30
Water tank
37
Engine oil filler plug
31
Antifreeze filler plug
38
Rear brake fluid reservoir
32
Draining bolt
39
Muffler
33
Rear brake pedal
N O T E
“”: meanstheinvisibleparts.

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The ignition switch is located
on the dashboard below.
The ignition switch has three
positions :
⊙“ ”(OFF)POSITION
In this position, the ignition
circuit is interrupted, a running
engine stops, and a
non-running engine will not
start.
The key can be removed.
Turning the ignition switch
to the“ ”position while the
motorcycle is moving can be
hazardous.
⊙“ ”(ON)POSITION
In this position, the ignition
circuit is closed and the engine
can be started.
The key cannot be removed
from the ignition switch in this
position.
N O T E
Start the engine
immediately after turning
the key to the “ ” position,
or the battery will lose power
due to consumption by the
lamp.
⊙“ ”(LOCK)POSITION
When you leave the
motorcycle, in order to prevent
theft, please turn the steering
handlebar to the left and insert
and press the key on " "
position, and rotate to the " "
H
P
U
S
CONTROLS
IGNITION SWITCH