Yamaha YZF-R125 Service Manual: Checking the coolant temperature sensor
1. Remove:
- Coolant temperature sensor
WARNING
|
2. Check:
- Coolant temperature sensor resistance
Out of specification →Replace.
a. Connect the pocket tester ( 
×
100) to the
coolant temperature sensor terminals as
shown.
- b. Immerse the coolant temperature sensor "1" in a container filled with coolant "2".
NOTE:
Make sure the coolant temperature sensor terminals do not get wet.
c. Place a thermometer "3" in the coolant.
d. Slowly heat the coolant, and then let it cool down to the specified temperature.
e. Check the coolant temperature sensor resistance.
3. Install:
- Coolant temperature sensor
Checking the radiator fan motor
1. Check:
Radiator fan motor
Faulty/rough movement → Replace.
a. Disconnect the radiator fan motor coupler
from the wire harness.
b. Connect the battery (DC 12 V) as shown.
Posi ...
Checking the throttle body sensor assembly
WARNING
Do not remove the throttle body sensor assembly.
Handle the throttle body sensor assembly
with special care
Never subject the throttle body sensor assembly
to strong ...
Other materials:
Fi system
The fuel pump delivers fuel to the fuel injector via the fuel filter. The
pressure regulator maintains the
fuel pressure that is applied to the fuel injector at only 250 kPa (2.50 kg/cm²,
36.3 psi). Accordingly,
when the energizing signal from the ECU energizes the fuel injector, the fuel ...
Checking the starter motor
1. Check:
Commutator
Dirt Clean with 600 grit
sandpaper.
2. Measure:
Commutator diameter "a"
Out of specification Replace
the starter
motor.
3. Measure:
Mica undercut "a"
Out of specification Scrape
the mica to the
proper measurement with a hacksaw blade
...
Starting the engine
In order for the ignition circuit cut-off
system to enable starting, one of the
following conditions must be met:
The transmission is in the neutral
position.
The transmission is in gear with
the clutch lever pulled and the sidestand
up.
1. Turn the key to "ON" and make
sure ...