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:

    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 ...

    Overheating
    Engine 1. Clogged coolant passages Cylinder head and piston Heavy carbon buildup 2. Engine oil Incorrect oil level Incorrect oil viscosity Inferior oil quality Cooling system 1. Coolant Low coolant level 2. Radiator Damaged or leaking radiator Faulty radiator cap ...

    Safe Riding
    Perform the pre-operation checks each time you use the vehicle to make sure it is in safe operating condition. Failure to inspect or maintain the vehicle properly increases the possibility of an accident or equipment damage. See page 4-1 for a list of pre-operation checks. This motor ...

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