Yamaha YZF-R125 Service Manual: Faulty front fork legs

Leaking oil

- Bent, damaged or rusty inner tube

- Cracked or damaged outer tube

- Improperly installed oil seal

- Damaged oil seal lip

- Incorrect oil level (high)

- Loose damper rod assembly bolt

- Damaged damper rod assembly bolt copper washer

- Cracked or damaged front fork cap O-ring

Malfunction

- Bent or damaged inner tube

- Bent or damaged outer tube

- Damaged fork spring

- Worn or damaged outer tube bushing

- Bent or damaged damper rod

- Incorrect oil viscosity

- Incorrect oil level

    Poor braking performance
    - Worn brake pad - Worn brake disc - Air in hydraulic brake system - Leaking brake fluid - Faulty brake caliper kit - Faulty brake caliper seal - Loose union bolt - Damaged brake hose - Oil or ...

    Unstable handling
    Handlebars - Bent or improperly installed right handlebar - Bent or improperly installed left handlebar 1. Steering head components - Improperly installed upper bracket - Improperly installed low ...

    Other materials:

    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 coupler as shown. Positive tester probe brown/white "1" Negative tester probe gray/black ...

    Identification numbers
    Record the key identification number, vehicle identification number and model label information in the spaces provided below for assistance when ordering spare parts from a Yamaha dealer or for reference in case the vehicle is stolen. KEY IDENTIFICATION NUMBER: VEHICLE IDENTIFICATION ...

    Checking the starter motor operation
    1. Check: Starter motor operation Does not operate → Perform the electric starting system troubleshooting, starting with step 4. Refer to "TROUBLESHOOTING" on page 8-9. a. Connect the positive battery terminal "1" and starter motor lead "2" with a jumper lead "3". W ...

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