HYOSUNG SF 50 User manual

1
IMPORTANT
BREAK-IN INFORMATION FOR
YOUR MOTORCYCLE
The first 1,000km(600miles) are the most impor-
tant in the life of your motorcycle .
Proper break-in operation during this time will
help ensure maximum life and performance from
your new motorcycle.
Hyosung parts are manufactured of high quality
materials, and manufactured parts are finished to
close tolerances. Proper break-in operation
allows the machined surfaces to polish each
other and mate smoothly.
Motorcycle reliability and performance depend
on special care and restraint exercised during
the break-in period. It is especially important that
you avoid operating the engine in a manner
which could expose the engine parts to exces-
sive heat.
Please refer to the BREAK-IN section for specific
break-in recommendations.
NOTE: This provides special information to
make maintenance easier or important instruc-
tions clearer.
The personal safety of the rider may be
involved. Disregarding this information
could result in injury to the rider.
WARNING
WARNING/CAUTION/NOTE
Please read this manual and follow its instruc-
tions carefully. To emphasize special informa-
tion the words WARNING, CAUTION and NOTE
carry special meanings and should be carefully
reviewed.
These instructions point out special
service procedures or precautions
that must be followed to avoid damag-
ing the machine.
CAUTION

2
FOREWORD
THANK YOU for choosing Hyosung. We at
Hyosung have designed, tested and produced
this motorcycle using the most modern tech-
nology available to provide you with many
happy, enjoyable, safe riding. Motorcycling is
one of the most exhilarating sports and insure
your riding enjoyment, you should become
throughly familiar with the information pre-
sented in this Owner’s Manual before riding the
motorcycle.
The proper care and maintenance that your
motorcycle requires are outlined in this manual.
By following these instructions explicitly you will
insure a long trouble-free operating life for your
motorcycle. Your Hyosung dealer has experi-
enced technicians that are trained to provide
your machine with the best possible service with
the right tools and equipment.
All information, illustrations photographs and
specifications contained in this manual are
based on the latest product information avail-
able at the time of publication. Due to improve-
ments or other changes, there may be some
discrepancies in this manual. Hyosung reserves
the right to make changes at any time.
Please note that this manual applies to all speci-
fications for all respective destinations and
explains all equipments. Therefore, your model
may have different standard features than shown
in this manual.
HYOSUNG MOTORS & MACHINERY INC.
COPYRIGHT HYOSUNG MOTORS & MACHINERY INC.

3
TABLE OF CONTENTS
1. CONSUMER INFORMATION 4
ACCESSORY INSTALLATION AND
PRECAUTION TIPS
SAFE RIDING RECOMMENDATION
FOR MOTORCYCLE RIDERS
SERIAL NUMBER LOCATION
2. NAMES OF EACH PART 6
3. CONTROLS 7
INSTRUMENT PANEL
SWITCH
4. HOW TO USE 9
HOW TO USE THE HELMET HOLDER
HOW TO OPEN THE SEAT
HOW TO USE THE PERSONAL TRUNK
5. GASOLINE AND ENGINE OIL 10
HOW TO PROVIDE THE GASOLINE
HOW TO SUPPLY THE ENGINE OIL
6. THE PROPER OPERATIONS 11
HOW TO START THE ENGINE
HOW TO START OFF
ADJUSTING THE SPEEDS
HOW TO OPERATE THE BRAKE
HOW TO STOP AND PARK
BREAKING-IN
7. INSPECTION BEFORE RIDING 16
BRAKES
TIRES
GASOLINE AND ENGINE OIL
LAMPS
REAR-VIEW MIRRORS
REFLECTOR
8. PERIODIC MAINTENANCE 19
FRONT FORK
BRAKES
TIRES
AIR CLEANER
BATTERY
TRANSMISSION OIL
ENGINE OIL AND GASOLINE
9. MAINTENANCE TIPS 23
BRAKE LEVER
FUSES
BATTERY TERMINAL
AIR CLEANER
RUBBER CAP OF CABLES
10. SPECIFICATIONS 25

4
1. CONSUMER INFORMATION
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 genuine parts.
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, how-
ever, your dealer can assist you in selecting quality
accessories and installing them correctly.
Use extreme caution when selecting and installing
the accessories for your Hyosung. We have devel-
oped some general guidelines which will aid you
when deciding whether, and how to equip your
motorcycle.
(1) In case that additional weight or aerody-
namic 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 brack-
ets and other attachment hardware should
be carefully checked to ensure that it pro-
vides for a rigid, nonmovable 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 criti-
cally reduce these two safety fac tors. Also
determine that theloaddoes not interfere
with the operation of the suspension steering
or other control operations.
(3) Accessories fitted to the handlebars 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 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 con-
dition or by an instability in cross winds or when
being passed or passing large vehicles.
Improperly mounted or poorly designed acces-
sories 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 free-
dom of movement of the rider and may limit his
or her control ability.
(6) Additional electrical accessories may over
load 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.
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 aerody namics and
handling of the motorcycle.
Balance the load between the left and right side of
the motorcycle and fasten it securely.
MODIFICATION
Modification of the motorcycle, or removal of
original equipment may render the vehicle
unsafe or illegal.
Motorcycle riding is great fun and an exciting
sport. Motorcycle riding also requires that some
extra precautions be taken to ensure the safety of
the rider and passenger. These precautions are:
SAFE RIDING RECOMMENDATION
FOR MOTORCYCLE RIDERS
ACCESSORY INSTALLATION AND
PRECAUTION SAFETY TIPS

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 fancy clothing can be uncomfortable and
unsafe in terms of riding your motorcycle.
Choose good quality motorcycle riding apparel
in terms of riding your motorcycle.
INSPECTION BEFORE RIDING
Review throughly the instructions 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
form 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.
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!
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 special service infor
mation.
Frame number:
Engine number:
5
The frame number is stamped on the right
side of the frame under the footboard.
The engine serial number is stamped on the
up side of the crankcase assembly.
Please write down the numbers in the box
provided below for your future reference.
SERIAL NUMBER LOCATION

6
2. NAMES OF EACH PARTS
Rear brake lever
Turn signal switch
Horn switch
Ignition switch
Starter switch
Light switch
Throttle grip
Front brake lever
Fuel tank
Personal trunk
Oil tank
Rear carrier
Muffler
Air cleaner
Battery & Fuse
Seat lock
Helmet holder
Center stand
Kick start lever
means the invisable parts

P
U
S
H
I
G
N
I
T
I
O
N
PUSH
P
U
S
H
I
G
N
I
T
I
O
N
ON
OFF
KEY
LOCK
7
TURN SIGNAL INDICATOR LIGHT
When turn signals are being operated. the indicator
will flash intermitently.
OIL INDICATOR LIGHT
When the engine oil level in the tank becomes too
low requiringHYPOL OILrefilling. the indicator
will light. When the oil level check light turns on, the
3. CONTROLS
SPEEDOMETER
The speedometer indicates the road speed in
kilometers per hour.
ODOMETER
The odometer registers the total distance that the
motorcycle has been ridden.
FUEL GAUGE
It indicates the remaining fuel amount in the fuel tank.
E indicates the fuel tank is empty or nearly so. (the
remaining fuel is 1.3at E. the capacity is 4.8)
Fill the fuel tank before E.
IGNITION SWITCH
The ignition switch has three positions:
INSTRUMENT PANEL
SWITCH
(ON)POSITION
The ignition circuit is completed and the engine can
now be started. The key cannot be removed from
the ignition switch in this position.
(OFF)POSITION
All electrical circuits are cut off.
(LOCK)POSITION
To lock the steering, turn the handlebar all the way
to the left. Push down and turn key to the LOCK
position and remove the key. All electrical circuits
are disconnected.
The fuel gauge indicates the remaining
amount whenever the ignition switch is
ONor OFF. For checking the remain-
ing amount of fuel, put the motorcycles
on the center-stand and set the ignition
switch is ON.
CAUTION
The lack of Engine oil could cause serious
damages on the Engine.
CAUTION
remaining amount of oil has become approximately
0.23.

8
For preventing steal, Lock the steering.
Turn right the handle.
Turn the key from (OFF)to (Lock).
Pull out the key while from (Lock)to (OFF).
It is for left/right turning or changing lanes.
position - for right turn signal
position - for left turn signal
Push the switch to cancel the operation.
TURN SIGNAL SWITCH
HORN SWITCH
Press the switch to operate the horn.
LIGHT SWITCH
TURN SIGNAL SWITCH
HORN SWITCH
LIGHT SWITCH



Check if the steering is locked.
When it is not locked, Turn the handle right
a little.
CAUTION
Turn off the lamp right after completing the
turn or lane change.
If you keep the lamp on, it could cause other
drivers to be confused.
CAUTION


position
The headlamp, meter lamp and taillamp come on.
If not start engine, do not come on.


position
The headlamp, meter lamp and taillamp go off.

9
4. HOW TO USE
1) To unlock the seat, insert the ignition key into the
lock and turn it counterclockwise.
2) To lock the seat, push clown firmly until the seat
latch snaps into the locked position.
When keep a helmet temporally, use the helmet
holder following the illustration below.
HOW TO USE THE HELMET HOLDER
You can use the Trunk after opening the seat.
HOW TO OPEN THE SEAT
STARTER SWITCH
STARTER SWITCH
Push in the electric starter switch to rotate the starting
motor.
When the starter motor doesnt rotate within 5
seconds after pushing the switch, try again
after 10 seconds for preventing the damage
on battery.
CAUTION
NOTE: If the front or rear brake lever is not
squeezed, the starter motor will not rotate.
HELMET HOLDER

10
5. GASOLINE AND ENGINE OIL
1. Insert the ignition key into the lock located a center
of the footboard and turn it counterclockwise.
2. Open the fuel tank cover as it lift up lightly.
3. Turn the fuel tank cap left.
4. Fill the fuel tank and turn the cap right tightly.
HOW TO PROVIDE THE GASOLINE
GASOLINE
Keep the maintenance manual in the personal
trunk.
Put the helmet as shown in the picture.
HOW TO USE THE PERSONAL TRUNK
The trunk could be heated. Don’t keep
anything that doesn’t endure heat.
Dont keep the fragile.
Check if it is locked.
The unlocking of trunk could cause serious
accident.
Take care not to spill the oil in the trunk.
Dont allow water to get inside the trunk or
it could damage.
Dont wash the trunk with water. Use the
vacuum cleaner.
Dont keep the valuables in the trunk when
leaving unattended.
CAUTION
When refueling, always shut the engine
off and turn the ignition. Key to the
OFFposition. Never refuel near an
open flame.
Do not overfill the fuel tank. Do not fill
the fuel tank above the bottom of the
filler tube as shown in the illustration.
WARNING

11
HOW TO SUPPLY THE ENGINE OIL
OIL TANK CAP
Check how much the engine oil and
gasoline is left.
Put the motorcycle on the centerstand.
Before riding
6. THE PROPER OPERATIONS
HOW TO START THE ENGINE
P
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H
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G
N
I
T
I
O
N
Set the ignition switch ON
Squeeze the rear brake lever.
Take care not to spill gasoline during
refueling.
CAUTION
A burnt engine is usually a result of engine
starting with no oil in the oil tank. Check the
oil level before starting to avoid seriously
damage.
WARNING
Dont mix the unrecommended oil. It could
damage the engine.
When refilling the oil tank, Dont allow the
dust to get inside.
Mop the oil spilt.
Dont put the patch on the cap. It could
disturb the oil to be provided and damage
the engine.
CAUTION
Open the seat.
Turn the oil tank cap left.
Fill the oil tank and tighten it.
(Use the recommended oil)

1212
 Start using by the kick starter lever
You can start using by the kick starter lever when
there is some problem in battery.
Put the motorcycle on the center stand.
Set the ignition switch ON
Press forcefully the kick starter lever.
FULL THROTTLE OPERATION
Push the start switch without turning the
throttle grip.
Wnen it doesnt start after several trial, turn the
throttle grip to ~position.
Depress the start switch right after
started.
When the start motor doesnt rotate
within 5 seconds after pushing the start
switch, try again after 10 seconds for
preventing the damage on battery.
CAUTION
When started, return the throttle grip.
CAUTION
When started, return the kick starter lever.
CAUTION
Dont idle it indoor where there is little or no
ventilation available.
The exhaust gas including carbon monoxide
is extremely poisonous.
WARNING
It is not started easily in the cases as follows.
1It has been long since you started the motorcycle.
2There was no gasoline left.
In this case1.2, push the start button longer
without turning the throttle grip.
When the engine is cold, idle it for a while.

1313
HOW TO START OFF
Return the center stand.
For returning the center stand, push the motorcycle
forward gripping the rear brake lever with left hand
and the rear carrier with right hand.
SLOWLY
Be careful of the vehicles in back.
WARNING
When returning the center stand, Dont grip
the seat.
CAUTION
Ride on
Gripping the lever with both hands, be seated on
from leftside of the motorcycle.
Put the left foot on the earth and fasten the rear
brake lever.
Check the safety
Turn on the left turn signal lamp and check the
safety.
Grip up the rear brakd lever.
Start off
Depress the rear brake lever and turn the throttle
grip slowly, the motorcycle will start moving
forward.
Dont let the engine run excessively before
riding.
CAUTION

1414
REAR BRAKE FRONT BRAKE
Apply the front and rear brakes at the
sametime.
Grip the brake lever right after returning the
throttle grip.
Make the speed lower by operating the brake
slowly.
The quick brake can cause skidding.
Pay much more attention to driving
when rains or snows.
When the brake doesnt work normally, keep
low speeds and apply the brake lightly until
smoothly operated.
HOW TO OPERATE THE BRAKE
You can adjust the speeds with the throttle grip.
Turning - - - - Get faster
Returning - - - Get slower
RETURNING
TURNING
ADJUSTING THE SPEEDS
When turned the throttle grip excessively,
it will make quick start which is
dangerous.
WARNING
Using either front or rear brake is
dangerous and can cause skidding and loss
of control.
WARNING

1515
Turn on the turn signal lamp and
return the throttle grip.
HOW TO STOP AND PARK
P
U
S
H
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N
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T
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O
N
When completely stopped, turn off the
turn signal lamp. Set the key OFF
position.
Put the motorcycle on the center stand.
Lock the steering for security.
Pull the ignition key out of the lock and
keep it yourself.
During mamufacture only the best possible materials
are used and all machined parts are finished to a
very high standard but it is still necessary to allow
the moving parts toBREAK-INbefore subjecting
the engine to maximum stresses. The future
performance and reliability of the engine depends
on the care and restraint exercised during its early
life. The general rules are as follow:
Keep to these breaking-in speed limit:
Up to 1,000km(600miles):Less than 1/2
throttle
Upon reaching an odometer reading of
1,000km(600miles) you can subject the motorcycle
to full throttle operation.
Do not maintain constant engine speed for an
extended time period during any portion of the
break-in.
Try to vary the throttle position.
BREAKING-IN
Dont park the motorcycle on the slippery or
tilted surface.
CAUTION

1616
THE BRAKE LEVER
Turn the front/rear brake adjuster clockwise/or
counterclockwise to obtain the specified play.
After adjusting the play, check there is no
dragging and enough clearance between the
brake lever and grip when the lever is tightly
squeezed.
THE TIRE PRESSURE
If you see the problem with the tire, adjust the
pressure with the pressure gauge.
MIDDLE LINE
OVER NORMAL SHORT
BRAKES
TIRES
Running inspection once in a day and periodic
maintenance(4,000km or 8,000km)is necessary
for the full performance and preventing accidents.
7. INSPECTION BEFORE RIDING
Even though the motorcycle is not run
for a long time, the periodic maintence is
necessary.
The engine and muffler are too hot right
after engine stopped. please be caerful not
to be burned.
Dont inspect the engine indoor where
there is little or no ventilation available.
The exhaust gas is extremely poisonous.
CAUTION
15-25mm
5-20mm
BRAKE FLUID
Keep the motorcycle upright and place the
handlebar straight.
Check brake fluid level by observing the middle
line on the brake fluid reservoir.
When the level is below the middle line,
replenish with brake fluid.

1717
SCREW
WORN, CRACK
FOREIGN
MATERIAL
CRACKS AND CUTS
Check if
1) there are visible cracks and cuts.
2) there are pebbles stuck.
THE GASOLINE
THE DEPT OF TIRE TREAD
Change the tire if the remaining depth tire tread
becomes 1.6mm(0.06inch)or less.
WEAR LIMIT INDICATION POSITION MARK
GASOLINE AND ENGINE OIL
Check if the remaining gasoline is enough for
running to the destination.
Replenish the gasoline before reachingE
mark with the ignition switch in the ON
position.
FUEL GAUGE
FUEL RECOMMENDATION
Use unleaded gasoline with an octane rating
of 85~95 or higher (Research method).
Unleaded gasoline can extend spark plug life
and exhaust components life.
If pinking or knocking is experienced, substitute
higher octane grade gasoline or another brand,
because there are differences between brands.
ENGINE OIL
Replenish the Engine oil when the Engine oil
indicator light is on with the ignition switch in
the ONposition.
If there are some problem with the tire
pressure or cracks and cuts, it will
decrease the riding stability and lead to
flat tire.
CAUTION
WEAR LIMIT INDICATION
OIL INDICATOR LIGHT

18
Check if the head lamp, tail lamp and turn signal
lamp work well with the engine started.
Check if the lamp are dusty or damaged.
Check if the mirror shows the rear and/or side
views.
Check if the reflector is dusty or damaged.
HEAD LAMP
TURN SIGNAL LAMP
TURN SIGNAL LAMP
TAIL LAMP
LAMPS
REAR - VIEW MIRROR
REFLECTOR
The lock of engine oil will damage engine
severely.
CAUTION

19
8. PERIODIC MAINTENANCE
The belows show the schedule of periodic
maintenance by mileages. More frequent
maintenance must be performed on motorcycles
that are used under severe conditions.
LUBRICATION
ENGINE
First
1,000km
Throttle cable Motor oil 



Grease
Grease
InspectInspect
Grease every 2years or
every 20.000km
Inspect
Throttle grip
Brake hose, cable
Bearing of Steering
stem
Brake lever
Every
4,000km Every 8,000km
First
1,000km
Engine bolt/nut Tighten 

Clean every 3,000km
Inspect

Inspect
ReplaceClean
Replace every 2years
Clean
Air cleaner
Spark plug
Carburetor
Engine hose
Every
4,000km Every 8,000km
First
1,000km
Drive belt

Inspect
Inspect

Inspect

Inspect

Inspect
Brake
Tire
Bolt / Nut
Steering
Every
4,000km Every 8,000km
CHASSIS
Check if there is any noise by bend of front fork
while moving the handle upward and downward.
Inspect whether the steering stem is well
assembled while moving front fork up/
downwards and/or foreward/backward.
Turn the front/rear brake adjuster clockwise or
counterclockwise to obtain the specified play.
FRONT FORK
BRAKES









20
BRAKE FLUID
Keep the motorcycle upright and place the
handle straight.
Check the brake fluid level by observing the
middle line.
When the level is below the lower the middle
line, check if there is leakage.
BRAKE PADS
Wearing condition of brake pads can be
checked by observing the wear limit line on the
pads. When the wear exceeds the limit line,
replace the pads.
How to replenish with brake fluid
1. Clean the brake fluid reservoir around not to
allow dusts to get inside of it.
2. Loosen the screw and open the cap.
3. Replenish with brake fluid to the limit line.
the recommended brake fluid:DOT4
4. Fasten the cap.
MIDDLE LINE
WEAR LIMIT LINE
DISC
Check the front/rear brake while running in low
speeds.
Check if there is leakage or damage on the
brake fluid reservoir and the connected parts are
loose.
Check if the vibration damages the brake hose
while moving the handle left/right or running.
15-25mm
5-20mm
BRAKE HOSE
BRAKE
CALIPER