2002 YAMAHA DT125R tire type

6-16
PERIODIC MAINTENANCE AND MINOR REPAIR
6
EAU04233
Cleaning the air filter
elementThe air filter element should be
cleaned at the intervals specified in
the periodic maintenance and lubrica-
tion chart. Clean the air filter element
more frequently if you are riding in
unusually wet or dusty areas.
1. Remove panel A. (See page 6-8
for panel removal and installation
procedures.)
2. Remove the air filter case cover
by removing the screws.
1
2
1. Screw (×3)
2. Air filter case cover
4. Remove the wing nut, and then
separate the air filter element
from the guide.
5. Remove the sponge material
from the frame, clean it with sol-
vent, and then squeeze the
remaining solvent out.
6. 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.
12
3
4
1. Air filter element guide
2. Air filter element frame
3. Sponge material
4. Wing nut
3. Remove the air filter element
from the case.
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6-20
PERIODIC MAINTENANCE AND MINOR REPAIR
6 Tire inspection
The tires must be checked before
each ride. If the center tread depth
reaches the specified limit, if the tire
has a nail or glass fragments in it, or
if the sidewall is cracked, have a
Yamaha dealer replace the tire imme-
diately.
NOTE:
The tire tread depth limits may differ
from country to country. Always com-
ply with the local regulations.
1
2
1. Tread depth
2. Tire side wall
EAU00681
w8Have 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.
Tire information
This motorcycle is equipped with tube
tires.
EW000078
w8The 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.
Minimum tire tread depth
(front and rear)1.6 mm
FRONT
Manufacturer Size TypeBRIDGESTONE
2.75-21 45P TW25
REAR
Manufacturer Size Type
BRIDGESTONE
4.10-18 59P TW44
3MB-9-E8 6/13/01 10:55 AM Page 57

8-2
SPECIFICATIONS
8
Carburetor
Manufacturer MIKUNI
Model × quantity TM28SS × 1
Spark plug
Manufacturer/model NGK / BR9ES
NGK / BR8ES (CH, A only)
Spark plug gap 0.7–0.8 mm
Clutch typeWet, multiple-disc
Transmission
Primary reduction system Helical gear
Primary reduction ratio 71/22 (3.227)
Secondary reduction system Chain drive
Secondary reduction ratio 3.563
Number of drive chain
sprocket teeth (rear/front) 57/16
Transmission type Constant mesh 6-speed
Operation Left foot operation
Gear ratio 1st 2.833
2nd 1.875
3rd 1.412
4th 1.143
5th 0.957
6th 0.818Chassis
Frame type Semi double cradle
Caster angle 27°30’
Trail 113 mm
Tire
Front
Type With tube
Size 2.75-21 45P
Manufacturer/ BRIDGESTONE / TW25
model
Rear
Type With tube
Size 4.10-18 59P
Manufacturer/ BRIDGESTONE / TW44
model
Maximum load* 180 kg
178 kg (CH, A only)
Air pressure (cold tire)
up to 90 kg load*
Front125 kPa (1.25 kgf/cm
2, 1.25 bar)
Rear150 kPa (1.50 kgf/cm2, 1.50 bar)
3MB-9-E8 6/13/01 10:55 AM Page 89