2003 YAMAHA TW125 tire type

6-13
PERIODIC MAINTENANCE AND MINOR REPAIR
63. Pull the air filter element out.
4. Remove the sponge material
from the air filter element frame,
clean it with solvent, and then
squeeze the remaining solvent
out.
1
2
1. Sponge material
2. Air filter element frame
5. Apply oil of the recommended
type to the entire surface of the
sponge material, and then
squeeze the excess oil out.
NOTE:
The sponge material should be wet
but not dripping.
6. Pull the sponge material over the
air filter element frame.
7. Insert the element into the air fil-
ter case.
EC000082
cC
8Make sure that the air filter ele-
ment is properly seated in the
air filter case.
8The engine should never be
operated without the air filter
element installed, otherwise
the piston and/or cylinder may
become excessively worn.
8. Install the air filter case cover by
installing the screws.
9. Install the panel.
Recommended oil:
Engine oil
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6-18
PERIODIC MAINTENANCE AND MINOR REPAIR
6 Tire information
This motorcycle is equipped with tube
tires.
EW000078
w
8The front and rear tires should
be of the same make and
design, otherwise the handling
characteristics of the motorcy-
cle cannot be guaranteed.
8After extensive tests, only the
tires listed below have been
approved for this model by
Yamaha Motor Co., Ltd.
EAU00681
w
8Have a Yamaha dealer replace
excessively worn tires.
Besides being illegal, operat-
ing the motorcycle with exces-
sively worn tires decreases
riding stability and can lead to
loss of control.
8The replacement of all wheel-
and brake-related parts,
including the tires, should be
left to a Yamaha dealer, who
has the necessary profession-
al knowledge and experience.
8It is not recommended to
patch a punctured tube. If
unavoidable, however, patch
the tube very carefully and
replace it as soon as possible
with a high-quality product.
EAU00685
Spoke wheels
To maximize the performance, dura-
bility, and safe operation of your
motorcycle, note the following points
regarding the specified wheels.
8The wheel rims should be
checked for cracks, bends or
warpage, and the spokes for
looseness or damage before
each ride. If any damage is
found, have a Yamaha dealer
replace the wheel. Do not
attempt even the smallest repair
to the wheel. A deformed or
cracked wheel must be replaced.
8The wheel should be balanced
whenever either the tire or wheel
has been changed or replaced.
An unbalanced wheel can result
in poor performance, adverse
handling characteristics, and a
shortened tire life.
FRONT
Manufacturer Size Type
BRIDGESTONE130/80-18 M/C 66P TW-203
REAR
Manufacturer Size Type
BRIDGESTONE180/80-14 M/C 78P TW-204
5RS-9-E1 (TW125) 8/23/02 11:37 AM Page 49

8-2
SPECIFICATIONS
8
Air filterWet type element
Fuel
Type REGULAR UNLEADED
GASOLINE ONLY
Fuel tank capacity 7.0 L
Reserve amount 1.7 L
Carburetor
Manufacturer TEIKEI
Model ×quantity MV28 ×1
Spark plug
Manufacturer/Type NGK/DR8EA
Gap 0.6–0.7 mm
Clutch typeWet, multiple-disc
Transmission
Primary reduction system Spur gear
Primary reduction ratio 74/20 (3.700)
Secondary reduction system Chain drive
Secondary reduction ratio 3.643
Number of drive chain
sprocket teeth (rear/front) 51/14
Transmission type Constant mesh 5-speed
Operation Left foot operationGear ratio 1st 2.250
2nd 1.476
3rd 1.125
4th 0.926
5th 0.793
Chassis
Frame type Diamond
Caster angle 25.83°
Trail 93 mm
Tires
Front
Type With tube
Size 130/80-18 M/C 66P
Manufacturer/ BRIDGESTONE/TW-203
model
Rear
Type With tube
Size 180/80-14 M/C 78P
Manufacturer/ BRIDGESTONE/TW-204
model
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8-3
SPECIFICATIONS
8
Maximum load* 180 kg
Air pressure (cold tire)
up to 90 kg load*
Front
150 kPa (1.50 kgf/cm2, 1.50 bar)
Rear150 kPa (1.50 kgf/cm2, 1.50 bar)
90 kg load–Maximum
load*
Front
150 kPa (1.50 kgf/cm2, 1.50 bar)
Rear175 kPa (1.75 kgf/cm2, 1.75 bar)
*Total weight of rider, passenger, cargo and accessories
Wheels
Front
Type Spoke wheel
Size 18 ×2.50
Rear
Type Spoke wheel
Size 14M/C ×MT4.50Brakes
Front
Type Single disc brake
Operation Right hand
Fluid DOT 4
Rear
Type Drum brake
Operation Right foot
Suspension
Front
Type Telescopic fork
Rear
Type Swingarm (Monocross
suspension)
Spring/shock absorber
Front Coil spring/oil damper
Rear Coil spring/gas-oil damper
Wheel travel
Front 150 mm
Rear 150 mm
5RS-9-E1 (TW125) 8/23/02 11:37 AM Page 82