2000 YAMAHA SR125 wheel

PERIODIC MAINTENANCE AND MINOR REPAIR
6-31
6 3. Loosen the pinch bolt.
4. Remove the wheel axle. Make
sure the motorcycle is properly
supported.
NOTE:@ Do not depress the brake lever when
the disc and caliper are separated. @
EAU01394
Front wheel installation1. Install the speedometer gear unit
into the wheel hub. Make sure the
wheel hub and the speedometer
gear unit are installed with the pro-
jections meshed into the slots.
2. Lift up the wheel between the front
fork legs and guide the brake disc
between the brake pads. Make
sure the slot in the speedometer
gear unit fits over the stopper on
the front fork outer tube.
3. Install the wheel axle and let the
motorcycle down.4. Push down hard on the handle-
bars several times to check for
proper fork operation.
5. Tighten the wheel axle to the
specified torque.
6. Install the pinch bolt and tighten it
to the specified torque.
7. Install the speedometer cable.
1. Wheel axle
2. Pinch bolt
Tightening torque:
Wheel axle:
59 Nm (5.9 m·kg)
Pinch bolt:
20 Nm (2.0 m·kg)
E_3mw.book Page 31 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-32
6
EAU01116*
Rear wheel removal
EW000122
WARNING
@ l
It is advisable to have a Yamaha
dealer service the wheel.
l
Securely support the motor-
cycle so there is no danger of it
falling over.
@1. Place the motorcycle on the cen-
terstand.
2. Remove the cotter pin and nut.
Then remove the brake torque rod
bolt from the brake shoe plate.
3. Remove the brake adjusting nut
and brake rod from the brake cam
lever.4. Loosen the chain adjusting plates
on each side.
5. Remove the axle nut.
6. Pull out the rear axle.
7. Push the wheel forward and re-
move the drive chain.
8. Remove the wheel assembly.
1. Adjusting nut
2. Brake rod
3. Brake torque rod
4. Cotter pin
1. Axle nut
2. Chain adjusting plate
E_3mw.book Page 32 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-33
6
EAU01723*
Rear wheel installation1. Install the rear wheel and the axle.
2. Install the axle nut and let the
motorcycle down.
3. Insert the brake rod into the brake
cam lever and install the brake
pedal free play adjusting nut.
4. Install the brake torque rod bolt
and tighten to the specified tight-
ening torque. Then install a new
cotter pin.
5. Adjust the drive chain free play.
(See page 6-22.)
6. Tighten the axle nut to the speci-
fied tightening torque.7. Adjust the rear brake pedal height
and free play. (See page 6-17.)
EW000103
WARNING
@ Check the operation of the brake
light after adjusting the rear brake. @
EAU01008
TroubleshootingAlthough Yamaha motorcycles receive
a rigid inspection before shipment from
the factory, trouble may occur during
operation.
Any problem in the fuel, compression,
or ignition systems can cause poor
starting and loss of power. The trouble-
shooting chart describes a quick, easy
procedure for making checks.
If your motorcycle requires any repair,
bring it to a Yamaha dealer. The skilled
technicians at a Yamaha dealership
have the tools, experience, and know-
how to properly service your motor-
cycle. Use only genuine Yamaha parts
on your motorcycle. Imitation parts may
look like Yamaha parts, but they are of-
ten inferior. Consequently, they have a
shorter service life and can lead to ex-
pensive repair bills. Specified torque:
Brake torque rod bolt:
25 Nm (2.5 m·kg)
Specified torque:
Axle nut:
65 Nm (6.5 m·kg)
E_3mw.book Page 33 Monday, February 5, 2001 9:54 AM

7-1
7
EAU01518
7-MOTORCYCLE CARE AND STORAGE
CareThe exposure of its technology makes
a motorcycle charming but also vulner-
able. Although high-quality compo-
nents are used, they are not all rust-re-
sistant. While a rusty exhaust pipe may
remain unnoticed on a car, it does look
unattractive on a motorcycle. Frequent
and proper care, however, will keep
your motorcycle looking good, extend
its life and maintain its performance.
Moreover, the warranty states that the
vehicle must be properly taken care of.
For all these reasons, it is recommend-
ed that you observe the following
cleaning and storing precautions.Before cleaning
1. Cover up the muffler outlet with a
plastic bag.
2. Make sure that all caps and covers
as well as all electrical couplers
and connectors, including the
spark plug cap, are tightly in-
stalled.
3. Remove extremely stubborn dirt,
like oil burnt onto the crankcase,
with a degreasing agent and a
brush, but never apply such prod-
ucts onto seals, gaskets, sprock-
ets, the drive chain and wheel
axles. Always rinse the dirt and
degreaser off with water.Cleaning
After normal use
Remove dirt with warm water, a neutral
detergent and a soft clean sponge,
then rinse with plenty of clean water.
Use a tooth or bottle brush for hard-to-
reach parts. Tougher dirt and insects
will come off more easily if the area is
covered with a wet cloth for a few min-
utes before cleaning.
E_3mw.book Page 1 Monday, February 5, 2001 9:54 AM

MOTORCYCLE CARE AND STORAGE
7-2
7
ECA00010
CAUTION:@ l
Avoid using strong acidic wheel
cleaners, especially on spoked
wheels. If you do use such
products for hard-to-remove
dirt, do not leave it on any long-
er than instructed, then thor-
oughly rinse it off with water,
immediately dry the area and
apply a corrosion protection
spray.
l
Improper cleaning can damage
windshields, cowlings, panels
and other plastic parts. Use
only a soft, clean cloth or
sponge with mild detergent and
water to clean plastic.
l
Do not use any harsh chemical
products on plastic parts. Be
sure to avoid using cloths or
sponges which have been in
contact with strong or abrasive
cleaning products, solvent or
thinner, fuel (gasoline), rust re-
movers or inhibitors, brake flu-
id, antifreeze or electrolyte.
l
Do not use high-pressure wash-
ers or steam-jet cleaners since
they cause water seepage and
deterioration in the following ar-
eas: seals (of wheel bearings,
swingarm bearings, forks and
brakes), electric components
(couplers, connectors, instru-
ments, switches and lights),
breather hoses and vents.
l
For motorcycles equipped with
a windshield: Do not use strong
cleaners or hard sponges as
they will cause dulling or
scratching. Some cleaning
compounds for plastic may
leave scratches on the wind-
shield. Test the product on a
small hidden part of the wind-
shield to make sure they do not
leave any marks. If the wind-
shield is scratched, use a quali-
ty plastic polishing compound
after washing.
@
E_3mw.book Page 2 Monday, February 5, 2001 9:54 AM

MOTORCYCLE CARE AND STORAGE
7-5
7 a. Remove the spark plug cap and
spark plug.
b. Pour a teaspoonful of engine oil
into the spark plug bore.
c. Install the spark plug cap onto the
spark plug and place the spark
plug on the cylinder head so that
the electrodes are grounded. (This
will limit sparking during the next
step.)
d. Turn the engine over several times
with the starter. (This will coat the
cylinder wall with oil.)
e. Remove the spark plug cap from
the spark plug, install the spark
plug and then the spark plug cap.
EWA00003
WARNING
@ When turning the engine over, be
sure to ground the spark plug elec-
trodes to prevent damage or injury
from sparking. @
6. Lubricate all control cables and
the pivoting points of all levers and
pedals as well as of the sidestand/
centerstand.
7. Check and, if necessary, correct
the tire air pressure, then raise the
motorcycle so that both of its
wheels are off the ground. Alterna-
tively, turn the wheels a little every
month in order to prevent the tires
from becoming degraded in one
spot.
8. Cover up the muffler outlet with a
plastic bag to prevent moisture
from entering.9. Remove the battery and fully
charge it. Store it in a cool, dry
place and recharge it once a
month. Do not store the battery in
an excessively cold or warm place
(less than 0 °C or more than
30 °C). For more information, see
“Battery storage” in the chapter
“PERIODIC MAINTENANCE AND
MINOR REPAIRS”.
NOTE:@ Make any necessary repairs before
storing the motorcycle. @
E_3mw.book Page 5 Monday, February 5, 2001 9:54 AM

8-1
8
EAU01038
8-SPECIFICATIONSSpecifications
Model SR125
Dimensions
Overall length 2,020 mm
Overall width 775 mm
Overall height 1,100 mm
Seat height 745 mm
Wheelbase 1,285 mm
Ground clearance 155 mm
Minimum turning radius 2,100 mm
Basic weight (with oil and full
fuel tank)
113 kg
Engine
Engine type Air-cooled 4-stroke, SOHC
Cylinder arrangement Forward-inclined single cylinder
Displacement 124 cm
3
Bore ´ Stroke 57.0 ´ 48.8 mm
Compression ratio 10:1
Starting system Electric starter
Lubrication system Wet sumpEngine oil
Ty p e
Recommended engine oil
classification API Service SE, SF, SG type or
higher
Quantity
Periodic oil change 1.0 L
With oil filter replacement 1.1 L
Total amount 1.3 L
Air filterWet type element
-20˚ -10˚ 0˚
10˚20˚ 30˚
40˚50˚C
SAE 10W/30
SAE 15W/40SAE 20W/40SAE 20W/50
SAE 10W/40
CAUTION:Be sure to use motor oils that do not contain anti-friction
modifiers. Passenger car motor oils (often labeled
“Energy Conserving”) contain anti-friction additives which
will cause clutch and/or starter clutch slippage, resulting in
reduced component life and poor engine performance.
E_3mw.book Page 1 Monday, February 5, 2001 9:54 AM

SPECIFICATIONS
8-3
8
Maximum load* 160 kg
Air pressure (cold tire)
Up to 90 kg load*
Front 175 kPa (1.75 kg/cm
2, 1.75 bar)
Rear 200 kPa (2.00 kg/cm2, 2.00 bar)
90 kg load ~ maximum load*
Front 175 kPa (1.75 kg/cm2, 1.75 bar)
Rear 225 kPa (2.25 kg/cm2, 2.25 bar)
*Load is total weight of cargo, rider, passenger and accessories
Wheels
Front
Type Spoke
Size 17 ´ 1.60
Rear
Type Spoke
Size 16 ´ 1.85
Brakes
Front
Type Single disc brake
Operation Right hand operation
Fluid DOT 4 or DOT 3
Rear
Type Drum brake
Operation Right foot operationSuspension
Front
Ty p e Te l e s c o p i c f o r k
Rear
Type Swingarm
Shock absorbers
Front Coil spring / oil damper
Rear Coil spring / oil damper
Wheel travel
Front 120 mm
Rear 76 mm
Electrical system
Ignition system C.D.I.
Charging system
Type C.D.I. magneto
Standard output 14 V, 9 A @ 5,000 r/min
Battery
Type 12N7-3B-1
Voltage, capacity 12 V, 7 AH
Headlight typeQuartz bulb (halogen)
E_3mw.book Page 3 Monday, February 5, 2001 9:54 AM