Yamaha YZF-R125 Service Manual: Removing the throttle body

1. Extract the fuel in the fuel tank through the fuel tank filler hole with a pump.

2. Disconnect:

  • Fuel hose
WARNING

Cover the fuel hose connections with a cloth when disconnecting them. Residual pressure in the fuel lines could cause fuel to spurt out when removing the hoses.

NOTE:

  • To remove the fuel hose from the fuel injector, slide the fuel hose connector cover "1" on the end of the hose in the direction of the arrow shown, press the two buttons "2" on the sides of the connector, and then remove the hose.
  • Remove the fuel hose manually without using any tools.
  • Before removing the hose, place a few rags in the area under where it will be removed.

Removing the throttle body


3. Remove:

  • Throttle body
CAUTION:

Do not remove the throttle body sensor assembly "1" from the throttle body.

Removing the throttle body


Checking the fuel injector

1. Check:

  • Fuel injector Damage Replace.

    Throttle body
    ...

    Checking the throttle body
    1. Check: Throttle body Cracks/damage Replace the throttle body. 2. Check: Fuel passages Obstruction Clean. a. Wash the throttle body in a petroleum-based solvent. Do not us ...

    Other materials:

    Removing the swingarm
    1. Stand the vehicle on a level surface. WARNINGSecurely support the vehicle so that there is no danger of it falling over. NOTE: Place the vehicle on a suitable stand so that the rear wheel is elevated. 2. Measure: Swingarm side play Swingarm vertical movement a. Me ...

    Removing the lower bracket
    1. Stand the vehicle on a level surface. WARNINGSecurely support the vehicle so that there is no danger of it falling over. 2. Remove: Upper ring nut Rubber washer Lower ring nut "1" Lower bracket NOTE: Remove the lower ring nut with the steering nut wrench "2". ...

    Checking the transmission
    1. Measure: Main axle runout (with a centering device and dial gauge "1") Out of specification Replace the main axle. 2. Measure: Drive axle runout (with a centering device and dial gauge "1") Out of specification Replace the drive axle. 3. Check: Transmiss ...

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