Yamaha YZF-R125 Service Manual: Installing the throttle body

Yamaha YZF-R125 Service Manual / Fuel system / Throttle body / Installing the throttle body

1. Install:

  • Throttle body joint clamps

NOTE:

Align the projections "a" on the throttle body joint with the slot "b" in each throttle body joint clamp.

Installing the throttle body


2. Install:

  • Throttle body joint

NOTE:

Align the projection "a" on the throttle body joint with the slot "b" in the intake manifold.

Installing the throttle body


3. Install:

  • Throttle body

NOTE:

Align the projection "a" on the throttle body with the slot "b" in the throttle body joint.

Installing the throttle body


4. Adjust:

Throttle cable free play Refer to "ADJUSTING THE THROTTLE CABLE FREE PLAY" on page 3-6.

5. Connect:

  • Fuel hose
CAUTION:

When installing the fuel hose, make sure that it is securely connected, and that the fuel hose connector cover on the fuel hose is in the correct position, otherwise the fuel hose will not be properly installed.

NOTE:

  • Install the fuel hose securely onto the fuel pump until a distinct "click" is heard.
  • To install the fuel hose onto the fuel pump, slide the fuel hose connector cover "1" on the end of the hose in the direction of the arrow shown.

    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 ...

    Air induction system
    1. Air induction system hose (air filter case to reed valve assembly) 2. Air induction system reed valve assembly 3. Air induction system hose (reed valve assembly to exhaust pipe) Checki ...

    Other materials:

    Intake air pressure sensor
    1. Check: Intake air pressure sensor output voltage Out of specification Replace the throttle body. a. Connect the pocket tester (DC 20 V) to the throttle body sensor assembly coupler as shown. Positive tester probe pink/white "1" Negative tester probe gray/black "2" ...

    Checking the primary drive gear
    1. Remove: Primary drive gear Refer to "BALANCER GEAR" on page 5-53. 2. Check: Primary drive gear Damage/wear  Replace the primary drive gear and clutch housing as a set. Excessive noise during operation Replace the primary drive gear and clutch housing as a set ...

    Checking the turn signal relay
    1. Check: Turn signal relay input voltage Out of specification →The wiring circuit from the main switch to the turn signal relay coupler is faulty and must be repaired. a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown. - Positive tester probe  b ...

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