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Yamaha YP125R Service Manual

Yamaha YP125R
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ELECTRICAL COMPONENTS
8-89
c. Set the main switch to ON.
d. Measure the intake air pressure sensor out-
put voltage.
▲▲▲▲▲ ▲▲▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲
EAS28420
CHECKING THE INTAKE AIR
TEMPERATURE SENSOR
1. Remove:
Intake air temperature sensor
(from the air filter case)
WARNING
EWA14110
Handle the intake air temperature sensor
with special care.
Never subject the intake air temperature
sensor to strong shocks. If the intake air
temperature sensor is dropped, replace it.
2. Check:
Intake air temperature sensor resistance
Out of specification Replace.
▼▼▼▼▼ ▼▼▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼
a. Connect the pocket tester ( × 1k) to the in-
take air temperature sensor terminal as
shown.
b. Immerse the intake air temperature sensor
1 in a container filled with water 2.
T
IP
Make sure that the intake air temperature sensor
terminals do not get wet.
c. Place a thermometer 3 in the water.
d. Heat the water or let it cool down to the spec-
ified temperature.
e. Measure the intake air temperature sensor
resistance.
▲▲▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲ ▲▲▲
EAS37P1083
CHECKING THE AIR TEMPERATURE
SENSOR
1. Remove:
Air temperature sensor
WARNING
EWA37P1017
Handle the air temperature sensor with
special care.
Never subject the air temperature sensor to
strong shocks. If the air temperature sen-
sor is dropped, replace it.
2. Check:
Air temperature sensor resistance
Out of specification Replace.
▼▼▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼ ▼▼▼
a. Connect the pocket tester ( × 1k) to the air
temperature sensor terminal as shown.
Test harness
90890-03204
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Positive tester probe
pink/white 1
Negative tester probe
gray/black 2
Intake air temperature sensor re-
sistance
2.212.69 k at 20 °C (68 °F)
Gy/R
P/W
Gy/B
12
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Air temperature sensor resis-
tance
4.194.63 k at 50 °C (122 °F)
3
1
2

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Yamaha YP125R Specifications

General IconGeneral
Engine TypeLiquid-cooled, 4-stroke, SOHC, 4-valve
Bore x Stroke52.4 mm x 57.9 mm
Fuel SystemFuel Injection
Ignition SystemTCI
TransmissionV-Belt Automatic
Front SuspensionTelescopic fork
Rear SuspensionUnit Swing
Front BrakeHydraulic single disc, Ø267 mm
Starter SystemElectric
Rear Tyre140/70-14M/C 62P (Tubeless)

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