Yamaha YZF-R125 Service Manual: Assembling the water pump

1. Install:

  • Water pump seal "1"
    (into the water pump housing "2")
CAUTION:

Never lubricate the water pump seal surface with oil or grease.

NOTE:

  • Install the water pump seal with the special tools.
  • Install the water pump seal with the special tools to the specified depth as shown in the illustration.

Assembling the water pump


A. Push down

3. Mechanical seal installer

4. Middle driven shaft bearing driver

Assembling the water pump


a. 0-0.5 mm (0-0.02 in)

2. Lubricate:

  • Water pump seal lip

3. Install:

  • Water pump housing gasket "1"

  • Water pump housing plate "2"
  • Impeller shaft
  • Impeller shaft retainer "3"

NOTE:

  • Before installing the impeller shaft retainer, lubricate the slit on the impeller shaft end with a thin coat of lithium-soap-based grease.
  • Install the water pump housing gasket, water pump housing plate, and impeller shaft retainer as shown in the illustration.
  • After installation, check that the impeller shaft rotates smoothly.

Assembling the water pump


    Checking the water pump
    1. Check: Water pump housing cover Water pump housing Cracks/damage Replace. Impeller shaft Cracks/damage/wear Replace. Bearing Rough movement Replace. Radiator outlet hose Crac ...

    Installing the water pump
    1. Install: Water pump assembly "1" O-rings "2" NOTE: Align the projection "a" on the impeller shaft with the slit "b" on the camshaft sprocket bolt. Lubricate the O-rings with a thi ...

    Other materials:

    Checking the throttle body joint and air filter case joint
    1. Remove: Right lower side cowling Left lower side cowling Refer to "GENERAL CHASSIS" on page 4-1. 2. Check: Throttle body joint "1" Air filter case joint "2" Cracks/damage Replace. 3. Install: Right lower side cowling Left lower side cowling Refer to "GENERAL CHAS ...

    Adjusting the throttle cable free play
    Throttle cable free play The throttle cable free play should measure 3.0-5.0 mm (0.12-0.20 in) at the throttle grip. Periodically check the throttle cable free play and, if necessary, adjust it as follows. TIP The engine idling speed must be correctly adjusted before checkin ...

    Removing the crankshaft
    1. Remove: Crankshaft "1" NOTE: Remove the crankshaft with the crankcase separating tool "2". Make sure the crankcase separating tool is centered over the crankshaft. CAUTION: To protect the end of the crankshaft, place an appropriate sized socket between the c ...

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