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:

    Replacing the air filter element and cleaning the check hose
    The air filter element should be replaced at the intervals specified in the periodic maintenance and lubrication chart. Have a Yamaha dealer replace the air filter element more frequently if you are riding in unusually wet or dusty areas. In addition, the air filter check hose must be ...

    Engine tightening torques
    Cylinder head tightening sequence: Generator cover tightening sequence: Clutch cover tightening sequence: Crankcase tightening sequence: A. Left crankcase B. Right crankcase ...

    Separating the crankcase
    1. Remove: Crankcase bolts NOTE: Loosen each bolt 1/4 of a turn at a time, in stages and in the proper sequence as shown. A. Right crankcase B. Left crankcase 2. Turn: Shift drum segment NOTE: Turn the shift drum segment "1" to the position shown in the illustration. In this ...

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