Yamaha YZF-R125 Service Manual: 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 thin coat of lithiumsoap- based grease.

Installing the water pump


2. Fill:

  • Cooling system (with the specified amount of the recommended coolant)

Refer to "CHANGING THE COOLANT" on page 3-15.

3. Check:

Cooling system Leaks Repair or replace the faulty
part.

4. Measure:

Radiator cap opening pressure Below the specified pressure
Replace the radiator cap.

Refer to "CHECKING THE RADIATOR" on page 6-3.

    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 ...

    Fuel system
    ...

    Other materials:

    Adjusting the rear disc brake
    1. Check: Brake pedal position (distance "a" from the center of the rider footrest to the center of the brake pedal) Out of specification Adjust. 2. Adjust: Brake pedal position a. Loosen the locknut "1". b. Remove the cotter pin "2", washer "3", and pin "4". c. Turn t ...

    Measuring the compression pressure
    NOTE: Insufficient compression pressure will result in a loss of performance. 1. Measure: Valve clearance Out of specification →Adjust. Refer to "ADJUSTING THE VALVE CLEARANCE" on page 3-3. 2. Start the engine, warm it up for several minutes, and then turn it off. 3. Remove: ...

    Checking the piston pin
    1. Check: Piston pin Blue discoloration/grooves  Replace the piston pin and then check the lubrication system. 2. Measure: Piston pin outside diameter "a" Out of specification Replace the piston pin. 3. Measure: Piston pin bore diameter "b" Out of specifica ...

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