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:
Assembling the water pump
1. Install:
Water pump seal "1"
(into the water pump housing "2")
CAUTION:Never lubricate the water pump seal
surface
with oil or grease.
NOTE:
Install the water pump seal with the special
tools.
Install the water pump seal with the special
tools to the specifi ...
Assembling the front fork legs
The following procedure applies to both of the
front fork legs.
WARNING
Make sure the oil levels in both front fork
legs are equal.
Uneven oil levels can result in poor handling
and a loss of stability.
NOTE:
When assembling the front fork leg, be sure to
rep ...
Checking the clutch boss
1. Check:
Clutch boss splines
Damage/pitting/wear Replace the
clutch
boss.
NOTE:
Pitting on the clutch boss splines will cause erratic
clutch operation.
Checking the pressure plate
1. Check:
Pressure plate
Cracks/damage Replace.
Checking the clutch push lever and short clutch push ...