Yamaha YZF-R125 Service Manual: Checking the clutch boss

Yamaha YZF-R125 Service Manual / Engine / Clutch / 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 clutch boss


Checking the pressure plate

1. Check:

Pressure plate Cracks/damage Replace.


Checking the clutch push lever and short clutch push rod

1. Check:

  • Clutch push lever
  • Short clutch push rod Damage/wear Replace the
    defective part(s).
    Checking the clutch housing
    1. Check: Clutch housing dogs "1" Damage/pitting/wear  Deburr the clutch housing dogs or replace the clutch housing. NOTE: Pitting on the clutch housing dogs will cause erratic cl ...

    Checking the primary drive gear
    1. Remove: Primary drive gear Refer to "BALANCER GEAR" on page 5-53. 2. Check: Primary drive gear Damage/wear  Replace the primary drive gear and clutch housing as a set. ...

    Other materials:

    Checking the speed sensor
    1. Check: Speed sensor output voltage Out of specification → Replace. a. Connect the pocket tester (DC 20 V) to the speed sensor coupler (wire harness end) as shown. Positive tester probe gray "1" Negative tester probe gray/black "2" b. Set the main switch to "ON". c. ...

    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" ...

    Troubleshooting method
    The engine operation is not normal and the engine trouble warning light comes on. 1. Check: Fault code number a. Check the fault code number displayed on the FI diagnostic tool. b. Identify the faulty system with the fault code. Refer to "Self-Diagnostic Function table". c. Identi ...

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