HYOSUNG RX 125 - User manual
1
IMPORTANT
The first 1,000km(600miles) are the most
important in the life of your motorcycle .
Proper break-in operation during this time will
help ensure maximum life and performance
from your new motorcycle.
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 man-
ner which could expose the engine parts to
excessive heat.
Please refer to the BREAK-IN section for spe-
cific break-in recommendations.
NOTE: This provides special information to
make maintenance easier or important instruc-
tions clearer.
Please read this manual and follow its
instructions carefully. To emphasize special
informa
tion the words WARNING, CAUTION and
NOTE carry special meanings and should be
carefully reviewed.
2
FOREWORD
THANK YOU for choosing . We at
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 present-
ed in this Owner's Manual before riding the
motorcycle.
The proper care and maintenance that your
motorcycle requires is 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
experienced 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
improvements or other changes, there may be
some discrepancies in this manual.
reserves the right to make changes at any time.
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 HYOSUNG MOTORS & MACHINERY INC.
3
TABLE OF CONTENTS
1. CONSUMER INFORMATION
ACCESSORY INSTALLATION AND
PRECAUTION SAFETY TIPS
SAFE RIDING RECOMMENDATION
FOR MOTORCYCLE RIDERS
SERIAL NUMBER LOCATION
2. NAMES OF EACH PARTS
3. CONTROLS
IGNITION SWITCH
IGNITION KEY
INSTRUMENT PANEL
LEFT HANDLEBAR SWITCH
RIGHT HANDLEBAR SWITCH
SUPPLY OF GASOLINE
KICK START LEVER
CARBURETOR CHOKE LEVER
FUELCOCK
REAR BRAKE PEDAL
GEARSHIFT LEVER
STAND
SEAT
REAR SUSPENSION
4.
FUEL AND OIL RECOMMENDATION
5. BREAK-IN
6. INSPECTION BEFORE RIDING
7. PERIODIC MAINTENANCE
LUBRICATION
ENGINE
CHASSIS
8. INSPECTION AND REPAIR
TOOL
INSPECTION OF BATTERY SOLUTION LEVEL
CLEAN OF BATTERY TERMINAL
CLEAN OF AIR CLEANER
FUEL HOSE
SPARK PLUG
ENGINE OIL
CARBURETOR
THROTTLE CABLE ADJUSTMENT
CLUTCH ADJUSTMENT
DRIVE CHAIN ADJUSTMENT
DRIVE CHAIN CLEANING AND OILING
BRAKES
TIRE
REPLACE OF THE LAMP
WHEN THE ENGINE REFUSES TO START
WHEN KEEPING FOR LONG PERIOD
4
1.CONSUMER INFORMATION
There are a great variety of accessories avail-
able to owners. can not
have direct control over the quality or suitabil-
ity of accessories you may wish to purchase
except genuine parts. The addition of unsuit-
able accessories can lead to unsafe operating
conditions. It is not possible for to
test each accessory on the market or combi-
nations of all the available accessories, how-
ever, your dealer can assist you in selecting
quality accessories and installing them cor-
rectly.
Use extreme caution when selecting and
installing the accessories for your .
We
have developed some general guidelines
which will aid you when deciding whether, and
how to equip your motorcycle.
(1) Anytime that additional weight or aerody-
namic affecting accessories are installed,
they should be mounted as low as possi-
ble, as close to the motorcycle and as
near the center of gravity as is feasible.
The mounting brackets and other attach-
ment hardware should be carefully
checked to ensure that it provides 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 critically reduce these two safety
factors. Also determine that the “load”
does not interfere with the operation of the
suspension steering or other control oper-
ations.
(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 lift-
ing 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 cau-
tion 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 abili-
ty.
(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 opera-
tion 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 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:
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 hel-
met. You should also wear suitable eye pro-
tection.
Loose fancy clothing can be uncomfortable
and unsafe when riding your motorcycle.
Choose good quality motorcycle riding apparel
when riding your motorcycle.
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.
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 per-
fect.
Ride within the boundaries of your own skill at
all times. Knowing these limits and staying
within them will help you to avoid accidents.
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 cross-
ings and on metal gratings and bridges.
Whenever in 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 when ordering
parts or referring to special service infor-
mation.
Frame number:
Engine number:
①
5
The frame number ① is stamped on the right
side of the steering head pipe.
The engine serial number ② is stamped on the
left upside of the crankcase assembly.
Please write down the numbers in the box pro-
vided below for your future reference.
②
6
2.NAMES OF EACH PARTS
① Clutch lever
② Left handle switch
③ Instrument panel
④ Ignition switch
⑤ Right handle switch
⑥ Throttle grip
⑦ Front brake lever
⑧ Fuel cock
⑨ Gear shifting lever
⑩ Side stand
⑪ Rear brake pedal
⑫ Engine oil level gauge
⑬ Kick start lever
O
F
F
O
N
L
O
C
K
ON
OFF
KEY
LOCK
3.CONTROLS
All electrical circuits are cut off.
The ignition circuit is completed and the engine
can now be started. The key cannot be removed
from the ignition switch in this position.
To lock the steering, turn the handlebar all
the way to the left. Push down the key to the
“OFF”
position and turn it to the
“LOCK”
position after come up again and remove
the key. All electrical circuits are discon-
nected.
The trip meter is a resettable odometer
located in the speedometer assembly. It can
be used to indicate the distance traveled on
short trip or between fuel stops.
Pressing control button will return the meter
to zero.
The odmeter registers the total distance that
the motorcycle has been ridden.
The speedometer indicates the road speed in
kilometers per hour.
The high beam indicator lamp will come on
when the headlamp high beam is turned on.
The meutral indicator lamp will come on when
the transmission is in neutral.
The lamp will go out when you shift into any
gear other than neutral.
When the turn signals are being operated either
to the right or to the left, the indicator will flash
at the same time.
This motorcycle comes equipped with a pair of
identical ignition keys.
Keep the spare key in a safe place.
7
8
Change direction of headlamp light.
Using to cut off dilivery power at rear wheel
when starting engine or shifting gear.
The headlamp, meter lamp and taillamp come
on. If not start engine, do not come on.
The headlamp, meter lamp and taillamp go
off.
The front brake is applied by squeezing the
brake lever gently toward the throttle grip.
Front brake be anxious about motorcycle
falling down when braking suddenly as disk
brake system.
Press the switch to operate the horn.
Using when left, right turn or change direction.
Flash the left turn signal lamp.
Flash the right turn signal lamp.
9
Push the electric starter button to rotate
the starter motor.The transmission is in
neutral for safety during start and squeez-
ing clutch.
To open the fuel tank cap, remove the end
of vent tube from the vehicle body and turn
fuel tank cap counter clockwise. To close
the fuel tank cap, turn it clockwise and
tighten it securely.
The kick start lever be exist at right side of
the engine.
This engine is possible starting any position
of gear after pull clutch lever as primary kick
start type.
Engine speed is controlled by position of the
throttle grip. Turn it toward you to increase
engine speed. Turn it away from you to
decrease the engine speed.
10
This motorcycle is equipped with a manually
operated fuelcock.
There are three position：“ON”, “OFF”and
“RES”.
The normal operating position for the fuelcock
lever is in the “ON”position.
After the engine starts next full com-
letely the choke lever toward left, was
returned the lever originally position as
halfway.
After operate engine with idling speed until
the engine sufficiently warms up, the choke
lever was returned completely toward
originally position.
Turn the lever to the “OFF”position whenever
stopping the engine for more than a few
minutes.
If the fuel level in the tank is too low, turn the
lever to the “RES”position to use of reserve
fuel supply.
5
4
3
2
N
15
4
3
2
N
1
11
Depressing the rear lbrake pedal will
apply the rear brake.
The brake light will be illuminated
when the rear brake is operated.
This motorcycle is equipped with a 5
speed constant mesh transmission switch
operates as shown in the figure.
The shift lever is attached to a ratchet
type mechanism in the transmission.
Each time that a gear is selected, the
gear shift lever will return to its normal
position ready to select the next gear.
Neutral is located between low and 2nd
gear. Low gear is engaged by depressing
the lever downward from the neutral posi-
tion. Shifting into the higher gears is
accomplished by lifting up on the shift lever
once for each gear. It is not possible to
upshift or downshift more than one gear at
a time due to the ratchet mechanism
being used.
When shifting from low to 2nd gear or
2nd gear to low, neutral will be auto-
matically skipped.
When neutral is desired, depress or lift the lever
to a position halfway between low and 2nd
gear.
1
12
① Side stand.
To separate the seat, loose two bolts
that are united the rear fender and the
frame below the seat.
When assemble the seat, put up the
seat at the frame and unit two bolts.
The rear shock absorber spring preload is
adjustable to compensate for rider, load,
riding style and road conditions.
Use both leaded gasoline, unleaded
gasoline.
However, use only one sort gasoline.
4. FUEL AND OIL RECOM
MENDATION
Using a premium quality four stroke
motor oil will increase the service
life of your motorcycle.
Use only oils which are rated SG or SJ
under the API classification system.
5. BREAK-IN
The opening explains how important
proper break-in is to achieving maxi-
mum life and performance from your
new Hyosung. The following guidelines
explain proper break-in procedures.
Operating the engine at constant low
speed (light load) can cause parts to glaze
and not seat in.
Allow the engine to accelerate freely
through the gear, without exceeding the
recommended maximum limits.
Do not, however use full throttle for
first 1,600km (1,000miles).
The engine speed should be varied and
not held at a constant speed.
This allows the parts to be “loaded”with
pressure and then unloaded, allowing the
parts to cool.
This aids the mating process of the parts. It
is essential that some stress be placed
on the engine components during
break-in to ensure this mating process.
Do not, though, apply excessive load
on the engine.
Allow sufficient idling time after warm or cold
engine start up before applying load or
reviving the engine. This allows time for the
lubricating oil to reach all critical engine
components.
The 1,000km (600miles) service is the
most important service your motorcycle
will receive.
Initial 800km (500miles)
Up to 1,600km (1,000miles)
Over 1,600km (1,000miles)
Below 5,000 RPM
Below 7,000 RPM
Below 10,000 RPM
ENGINE OIL
Temperature
This table shows the maximum recom-
mended engine RPM during the break-in period.
13
14
7. PERIODIC MAINTENANCE.
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 3,000kmClean
Inspect
←←
Inspect
ExchangeClean
Replace every 2years
Clean
Air cleaner
Spark plug
Carburetor
Fuel hose
Every
4,000km Every
8,000km
First
1,000km
Drive chain
←
Replace every 2years
Inspect
←
Inspect
←
Inspect
←
←
←
←
←
Inspect
Brake
Tire
Bolt / Nut
Steering
Every
4,000km Every
8,000km
The below show the schedule of periodic
maintenance by mileages.
More frequent maintenance must be per-
formed on motorcycles that are used under
severe conditions.
During break-in procedures all of the
engine components will have seated in.
All adjustments will be restored, all fasten-
ers will be tightened, and the dirty oil and
oil filter will be replaced.
Timely performance of the
1,000km
(600miles) service will ensure opti-
mom service life and performance
from the engine.
Before riding the motorcycle, be sure to check the
follwing item.
Inspect every day once them before riding the
motorcycle.
∙Abnormal point of the previous day.
∙Extra braking power of the brake lever.
∙Fluid measure of the master cylinder.
∙Pressure, crack, cut, strange wear, foreign sub
stance (stone, nail and others) of Tire.
∙Adequate tread depth of Tire.
∙Fluid measure of Engine oil.
∙Fluid measure of Fuel.
∙On and off condition or damage of Lamp,
turn signal lamp and others.
∙Condition of rear-view mirror.
6. INSPECTION BEFORE RIDING
15
8. INSPECTION AND REPAIR
To assist you in the performance of periodic
maintenance, a tool kit is supplied and is
located under the seat. The tool kit consists of
the following items.
This motorcycle is used MF(Maintenance
Free) battery of airtight type.
Inspection or supplement of battery do
unnecessary.
Clean the battery terminal when it is dusty or
rusted.
1. Set the ignition switch “OFF”position.
2. Disassemble the battery cover, loose the
(＋)position battery wire after the (－)nega
tive battery wire.
Remove the battery.
3. Clean the terminal.
If there is white dust, clean it with warm
water.
4. Assemble the battery wires and grease the
terminal lightly.
NO NAME
1
2
3
4
5
Tool bag
10 ×12 mm open end wrench
Spark plug wrench
Combination screw driver
Screw driver handle
①
⑤
④
③
②
0.8~0.9 mm
Cleaning
solvent
Oil
16
1. Take off the air cleaner filter.
2. Wash it with cleaning solvent and dry.
3. Immerse it in motor oil squeeze the oil off to
make it slightly wet with oil.
4. Assemble the air cleaner filter.
Replace the fuel hose every 4 years.
Remove the carbon deposits periodically
from the spark plug with a piece of hard
wire or pin.
1
1
17
Readjust the spark plug gap to 0.8~0.9 mm
(0.031~0.035 inch) by using a spark plug gap
thickness gauge.
Hotter type
Standard type
Colder type
PLUG REPLACEMENT GUIDE
N.G.K. C7EH-9
N.G.K. C8EH-9
N.G.K. C9EH-9
Change the engine oil and filter, after first
running 1,000km and every running
4,000km.
The oil should always be changed when the
engine is hot so that the oil will drain
throughly from the engine.
The procedure is as follows.
Note : About 950
ml
of oil will be required
when changing oil without replacing
the oil filter.
(1) Place the motorcycle on the jack or
block.
Superior engine life depends much on the
selection of quality oil and the periodic
changing of the oil.
Daily oil level checks and periodic changes are
two of the most important maintenances to be
performed.
643
7
5
2
18
(2)
Remove the engine oil filter plug ①.
(3) Drain the oil by removing the drain plug
② located on the bottom of the engine.
(4) Remove the three nuts.
Remove the filter cap ⑥, pull out the
element and replace with a new oil filter
element.
(5) Before replacing the oil filter cap ⑥,
check to be sure that the filter spring ④
and cap “O”ring ⑤ are installed correctly.
Install a new “O”ring each time that the
filter element is replaced.
(6) Replace the oil filter cap and tighten the
bolts securely.
(7) Replace the drain plug and pour
about 950
ml
of oil through the plug
hole.
(8) Operate the engine a few second by
idling speed.
Inspect to leak oil at the oil filter
cap.
(9) Confirm the oil level through the oil level
lenz after waiting about a minute next to
stoping the engine.
The oil level is located between the “Lower
line”and the “Upper line”.
When below the “Lower line”, refill the oil
between the “Lower line”and the “Upper
line”.
Undisturbed carburetion is the basis of
the performance you ought to expect of
your engine.
The carburetor is factory-set for the
best car buretion.
Do not attempt to alter its setting.
There are two items of adjustment,
however, under your care : engine idle
speed and throttle cable play.
4mm
3
4
21
5
6
12
0.5~1.0mm
19
Start up the engine and let the engine
run until it warms up fully.
After engine has warmed up, turn the
throttle valve stopper in or out so that
the engine may run at 1,450~1,550
RPM.
(1) Loosen the lock nut ①.
(2) Adjust the cable slack by cable adjuster ②
in or out to obtain the correct slack
0.5~1.0mm (0.02~0.04in).
(3) After adjusting the slack, tighten the lock
nut.
At each maintenance interval, adjust the
clutch cable play by means of clutch cable
adjuster.
The cable play should be 4mm(0.16in) as
measured at the clutch lever holder before
the clutch begins to disengage.
50~60mm
3
4
12
20
① The clutch lever play.
② The lock nut
③ The clutch lever adjuster
④ The rubber boot
⑤ The cable adjuster
⑥ The clutch cable adjuster lock nut.
If you find the play of the clutch incorrect,
adjust it in the following way :
(1) Loosen the lock nut ② and the clutch
lever adjuster ③ turn all the way toward
clockwise.
(2) Loosen the clutch cable adjuster lock nut
⑥.
Turn the cable adjuster ⑤ that the clutch
lever
play ① should be 4mm(0.16in)
(3) A little adjustment be allowed by the
clutch lever adjuster ③.
(4) After end of adjustment, tighten the lock
nut ②, ⑥ and cover the rubber boot ④.
Chain adjust in the following way.
The chain may require more frequent
adjustment that it is with periodic mainte
nance depending upon your riding condi-
tions.
Check the chain every 1,000km.
(1)Place the motorcycle on the jack or
block
(2) Loosen the axle nut ①.
(3) Adjust the slack in the drive chain by
adjuster ③ as the lock nut ② turning
toward the left and right.
(4) For alignment of the rear sprocket and the
front sprocket, there are reference mark ④
on the same position.
After aligning and adjusting the slack in
the drive chain to 50~60mm (2.0~2.4in),
retighten the axle nut securely and perform
a final inspection.
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