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:

    Catalytic converters
    This vehicle is equipped with catalytic converters in the exhaust system. WARNING The exhaust system is hot after operation. To prevent a fire hazard or burns: Do not park the vehicle near possible fire hazards such as grass or other materials that easily burn. Park the vehic ...

    Aftermarket Parts, Accessories, and Modifications
    While you may find aftermarket products similar in design and quality to genuine Yamaha accessories, recognize that some aftermarket accessories or modifications are not suitable because of potential safety hazards to you or others. Installing aftermarket products or having other modif ...

    Installing the cylinder head
    1. Install: Cylinder head NOTE: Pass the timing chain through the timing chain cavity. 2. Tighten: Cylinder head bolts "1" Cylinder head bolts "2" NOTE: Lubricate the cylinder head bolts and washers with engine oil. Tighten the cylinder head bolts in the proper tighten ...

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