• Always obey the speed limit
and never travel faster than
warranted by road and traffic
conditions.
• Always signal before turning or
changing lanes. Make sure that
other motorists can see you.
The posture of the operator and
passenger is important for proper
control.
• The operator should keep both
hands on the handlebar and
both feet on the operator foo-
trests during operation to
maintain control of the
motorcycle.
• The passenger should always
hold onto the operator, the seat
strap or grab bar, if equipped,
with both hands and keep both
feet on the passenger foo-
trests.
• Never carry a passenger
unless he or she can firmly pla-
ce both feet on the passenger
footrests.
Never ride under the influence of
alcohol or other drugs.Protective apparel
The majority of fatalities from
motorcycle accidents are the result of
head injuries. The use of a safety hel-
met is the single most critical factor in
the prevention or reduction of head
injuries.
Always wear an approved hel-
met.
Wear a face shield or goggles.
Wind in your unprotected eyes
could contribute to an impair-
ment of vision that could delay
seeing a hazard.
The use of a jacket, heavy boots,
trousers, gloves, etc., is effective
in preventing or reducing abra-
sions or lacerations.
Never wear loose-fitting clothes,
otherwise they could catch on
the control levers, footrests, or
wheels and cause injury or an
accident.
Never touch the engine or
exhaust system during or after
operation. They become very hot
and can cause burns. Always
wear protective clothing that
covers your legs, ankles, and
feet.
Passengers should also observe
the precautions mentioned abo-
ve.
Modifications
Modifications made to this motorcy-
cle not approved by Yamaha, or the
removal of original equipment, may
render the motorcycle unsafe for use
and may cause severe personal injury.
Modifications may also make your
motorcycle illegal to use.
1
SAFETY INFORMATION t
1-2
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EAU15591
The condition of a vehicle is the
owner’s responsibility. Vital compo-
nents can start to deteriorate quickly
and unexpectedly, even if the vehicle
remains unused (for example, as a
result of exposure to the elements).
Any damage, fluid leakage or loss of
tire air pressure could have serious
consequences. Therefore, it is very
important, in addition to a thorough
visual inspection, to check the follo-
wing points before each ride.
NOTE:
Pre-operation checks should be
made each time the vehicle is used.
Such an inspection can be accom-
plished in a very short time; and the
added safety it assures is more than
worth the time involved.
EWA11150
s s
WARNING
If any item in the Pre-operation
check list is not working properly,
have it inspected and repaired
before operating the vehicle.
4
PRE-OPERATION CHECKS
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Control cables• Make sure that operation is smooth.
6-21• Lubricate if necessary.
• Check chain slack.
Drive chain• Adjust if necessary.
6-19/6-20
• Check chain condition.
• Lubricate if necessary.
• Check for damage.
Wheels and tires• Check tire condition and tread depth.
6-13
• Check air pressure.
• Correct if necessary.
Brake and shift pedals• Make sure that operation is smooth.
6-21
• Lubricate pedal pivoting points if necessary.
Brake and clutch levers• Make sure that operation is smooth.
6-21
• Lubricate lever pivoting points if necessary.
Sidestand• Make sure that operation is smooth.
6-21
• Lubricate pivot if necessary.
Chassis fasteners• Make sure that all nuts, bolts and screws are properly tightened.
–
• Tighten if necessary.
Instruments, lights,• Check operation.
–
signals and switches• Correct if necessary.
Engine stop switch• Check operation.3-3
Sidestand switch• Check operation of ignition circuit cut-off system.
3-11
• If system is defective, have Yamaha dealer check vehicle.
PRE-OPERATION CHECKS
4-3
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EAU17240
Safety is an obligation of the owner.
Periodic inspection, adjustment and
lubrication will keep your vehicle in
the safest and most efficient condi-
tion possible. The most important
points of inspection, adjustment, and
lubrication are explained on the follo-
wing pages.
The intervals given in the periodic
maintenance and lubrication chart
should be simply considered as a
general guide under normal riding
conditions. However, DEPENDING
ON THE WEATHER, TERRAIN, GEO-
GRAPHICAL LOCATION, AND INDIVI-
DUAL USE, THE MAINTENANCE
INTERVALS MAY NEED TO BE
SHORTENED.
EWA10320
s s
WARNING
If you are not familiar with mainte-
nance work, have a Yamaha dealer
do it for you.
EAU17320
Owner’s tool kit
1. Tool kit
The service information included in
this manual and the tools provided in
the owner’s tool kit are intended to
assist you in the performance of pre-
ventive maintenance and minor
repairs. However, additional tools
such as a torque wrench may be
necessary to perform certain mainte-
nance work correctly.
NOTE:
If you do not have the tools or expe-
rience required for a particular job,
have a Yamaha dealer perform it for
you.
EWA10350
s s
WARNING
Modifications not approved by
Yamaha may cause loss of perfor-
mance and render the vehicle
unsafe for use. Consult a Yamaha
dealer before attempting any chan-
ges.
6
PERIODIC MAINTENANCE AND MINOR REPAIR
6-1
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ODOMETER READING (x 1000 Km) ANNUAL
CHECK
NoITEM CHECK OR MAINTENANCE JOB 1 6 12 18 24
9*Tires• Check tread depth and for damage.
• Replace if necessary.
• Check air pressure.√√√√ √
• Correct if necessary.
10 *Wheel bearings• Check bearing for looseness or damage.√√√√
11 *Swingarm• Check operation and for excessive play.√√√√• Lubricate with lithium-soap-based grease. Every 24000 km
• Check chain slack, alignment and condition.
12Drive chain• Adjust and lubricate chain with a special O-ring chain Every 500 km and after washing the
lubricant thoroughly.motorcycle or riding in the rain
13 *Steering bearings• Check bearing play and steering for roughness.√√ √ √√• Lubricate with lithium-soap-based grease. Every 50000 km
14 *Chassis fasteners• Make sure that all nuts, bolts and screws
√√√√ √
are properly tightened.
15Sidestand• Check operation.
• Lubricate.√√√√ √
16 *Sidestand switch• Check operation.√√ √ √√ √
17 *Front fork• Check operation and for oil leakage.√√√√
18 *Shock absorber assembly•Check operation and shock absorber for oil leakage.√√√√
Rear suspension relay • Check operation.√√√√
19 *arm and connecting arm
• Lubricate with lithium-soap-based grease.
√√
pivoting points
20 *Carburetor• Check starter (choke) operation.
• Adjust engine idling speed.√√ √ √√ √
21 *Autolube pump• Check operation.
• Bleed if necessary.√√√√
PERIODIC MAINTENANCE AND MINOR REPAIR
6-3
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EAU19292
Panels D and E
1. Screw
To remove one of the panels
Remove the screw, and then pull the
panel off as shown.
T
o install the panel
Place the panel in the original posi-
tion, and then install the screw.
EAU19620
Checking the spark plug
1. Spark plug inspection
The spark plug is an important engine
component, which should be chec-
ked periodically, preferably by a
Yamaha dealer. Since heat and depo-
sits will cause any spark plug to
slowly erode, it should be removed
and checked in accordance with the
periodic maintenance and lubrication
chart. In addition, the condition of the
spark plug can reveal the condition of
the engine.The porcelain insulator around the
center electrode of the spark plug
should be a medium-to-light tan (the
ideal color when the vehicle is ridden
normally). If the spark plug shows a
distinctly different color, the engine
could be defective. Do not attempt to
diagnose such problems yourself.
Instead, have a Yamaha dealer check
the vehicle.
If the spark plug shows signs of elec-
trode erosion and excessive carbon
or other deposits, it should be repla-
ced.
Specified spark plug:
BR8ES (NGK)
Before installing a spark plug, the
spark plug gap should be measured
with a wire thickness gauge and, if
necessary, adjusted to specification.
Spark plug gap:
0,7-0,8 mm (0,0276-0,0315 in)
Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
6
PERIODIC MAINTENANCE AND MINOR REPAIR
6-6
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EAU21590
Tires
To maximize the performance, durabi-
lity, and safe operation of your
motorcycle, note the following points
regarding the specified tires.
Tire air pressure
The tire air pressure should be chec-
ked and, if necessary, adjusted befo-
re each ride.
EWA10500
s s
WARNING
The tire air pressure must be
checked and adjusted on cold
tires (i.e., when the temperatu-
re of the tires equals the
ambient temperature).
The tire air pressure must be
adjusted in accordance with
the riding speed and with the
total weight of rider, passenger,
cargo, and accessories appro-
ved for this model.
Tire air pressure (measured on cold
tires):
DT125R
Up to 90 kg (198 lb):
Front:
150 kPa (21,8 psi) (1,5 kgf/cm
2)
Rear:
175 kPa (25,4 psi) (1,75 kgf/cm
2)
90 kg (198 lb) to maximum load:
Front:
175 kPa (25,4 psi) (1,75 kgf/cm
2)
Rear:
200 kPa (28,9 psi) (2 kgf/cm
2)
Maximum load*:
178 kg (392 lb)
DT125X
Up to 90 kg (198 lb):
Front:
180 kPa (26,1 psi) (1,8 kgf/cm
2)
Rear:
200 kPa (28,9 psi) (2 kgf/cm
2)
90 kg (198 lb) to maximum load:
Front:
180 kPa (26,1 psi) (1,8 kgf/cm
2)
Rear:
200 kPa (28,9 psi) (2 kgf/cm
2)
Maximum load*:
180 kg (396 lb)
* Total weight of rider, passenger, car-
go and accessories
EWA11200
s s
WARNING
Because loading has an enormous
impact on the handling, braking,
performance and safety characte-
ristics of your vehicle, you should
keep the following precautions in
mind.
NEVER OVERLOAD THE VEHI-
CLE! Operation of an overloa-
ded motorcycle may result in
tire damage, loss of control, or
severe injury. Make sure that
the total weight of rider, pas-
senger, cargo, and accessories
does not exceed the specified
maximum load for the vehicle.
Do not carry along loosely pac-
ked items, which can shift
during a ride.
Securely pack the heaviest
items close to the center of the
vehicle and distribute the
weight evenly on both sides.
Adjust the tire air pressure with
regard to the load.
Check the tire condition and air
pressure before each ride.
6
PERIODIC MAINTENANCE AND MINOR REPAIR
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EAU23100
Checking and lubricating the
cables
The operation of all control cables
and the condition of the cables
should be checked before each ride,
and the cables and cable ends should
be lubricated if necessary. If a cable is
damaged or does not move smoothly,
have a Yamaha dealer check or repla-
ce it.
Recommended lubricant:
Engine oil
EWA10720
s s
WARNING
Damage to the outer sheath may
interfere with proper cable opera-
tion and will cause the inner cable
to rust. Replace a damaged cable
as soon as possible to prevent
unsafe conditions.
EAU23110
Checking and lubricating the
throttle grip and cable
The operation of the throttle grip
should be checked before each ride.
In addition, the cable should be lubri-
cated or replaced at the intervals spe-
cified in the periodic maintenance
chart.
EAU23120
Adjusting the Autolube pump
The Autolube pump is a vital and sop-
histicated component of the engine,
which must be adjusted by a Yamaha
dealer at the intervals specified in the
periodic maintenance and lubrication
chart.
EAU23131
Checking and lubricating the
brake and shift pedals
The operation of the brake and shift
pedals should be checked before
each ride, and the pedal pivots
should be lubricated if necessary.
Recommended lubricant:
Lithium-soap-based grease (all-pur-
pose grease)
EAU23140
Checking and lubricating the
brake and clutch levers
The operation of the brake and clutch
levers should be checked before each
ride, and the lever pivots should be
lubricated if necessary.
Recommended lubricant:
Lithium-soap-based grease (all-pur-
pose grease)
EAU23200
Checking and lubricating the
sidestand
The operation of the sidestand should
be checked before each ride, and the
sidestand pivot and metal-to-metal
contact surfaces should be lubricated
if necessary.
EWA10730
s s
WARNING
If the sidestand does not move up
and down smoothly, have a Yama-
ha dealer check or repair it.
6
PERIODIC MAINTENANCE AND MINOR REPAIR
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