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:

    Adjusting the throttle cable free play
    NOTE: Prior to adjusting the throttle cable free play, the engine idling speed should be adjusted. 1. Check: Throttle cable free play "a" Out of specification →Adjust. 2. Remove: Right side panel Refer to "GENERAL CHASSIS" on page 4-1. 3. Adjust: Throttle cable f ...

    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 terminal "1" Negative tester probe → gray/black terminal "2" b. Measure the throttle pos ...

    Checking the front brake disc
    1. Remove: Front wheel Refer to "FRONT WHEEL" on page 4-6. 2. Check: Brake disc Damage/galling Replace. 3. Measure: Brake disc deflection Out of specification Correct the brake disc deflection or replace the brake disc. a. Place the vehicle on a suitable stand ...

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