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:

    Checking the spark plug cap
    1. Check: Spark plug cap resistance Out of specification Replace. a. Remove the spark plug cap from the spark plug lead. b. Connect the pocket tester ( × 1k) to the spark plug cap as shown. c. Measure the spark plug cap resistance. ...

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    Adding accessories or cargo to your motorcycle can adversely affect stability and handling if the weight distribution of the motorcycle is changed. To avoid the possibility of an accident, use extreme caution when adding cargo or accessories to your motorcycle. Use extra care when ridi ...

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