Yamaha YZF-R125 Service Manual: Intake air pressure sensor
1. Check:
- Intake air pressure sensor output voltage
Out of specification Replace the throttle
body.
a. Connect the pocket tester (DC 20 V) to the
throttle body sensor assembly coupler as
shown.
- Positive tester probe
pink/white "1" - Negative tester probe
gray/black "2"
b. Set the main switch to "ON".
c. Measure the intake air pressure sensor output voltage.
Throttle position sensor
1. Check:
Throttle position sensor
a. Connect the digital circuit tester to the terminals
of the throttle body sensor assembly
coupler as shown.
Positive tester probe →
gray/red t ...
Intake air temperature sensor
1. Check:
Intake air temperature sensor resistance
Out of specification Replace
the throttle
body.
a. Connect the pocket tester ( ×
1k) to the
throttle body sensor assembly co ...
Other materials:
Installing the front fork legs
The following procedure applies to both of the
front fork legs.
1. Install:
Front fork leg
Temporarily tighten the upper and lower
bracket pinch bolts.
NOTE:
Make sure the inner tube end position "a" is 24.5
mm (0.96 in) from the top of the upper bracket.
2. Tighten:
Lower br ...
Checking the fuel sender
1. Drain the fuel from the fuel tank.
2. Check:
Fuel sender resistance
Out of specification → Replace the fuel
sender.
a. Connect the pocket tester ( ×
10) to the fuel
sender coupler as shown.
Positive tester probe
sky blue "1"
Negative tester probe
orange/white " ...
Disassembling the water pump
1. Remove:
Water pump seal "1"
NOTE:
Remove the water pump seal from the inside of
the water pump housing "2".
2. Remove:
Bearing "1"
NOTE:
Remove the bearing from the outside of the water
pump housing "2".
...