Yamaha YZF-R125 Service Manual: Checking the oil pump

Yamaha YZF-R125 Service Manual / Engine / Oil pump / Checking the oil pump

1. Check:

  • Oil pump drive gear
  • Oil pump driven gear
  • Oil pump housing
  • Oil pump housing cover Cracks/damage/wear Replace the
    defective part(s).

2. Measure:

  • Inner-rotor-to-outer-rotor-tip clearance "a"
  • Outer-rotor-to-oil-pump-housing clearance "b"
  • - Oil-pump-housing-to-inner-rotor-and-outerrotor clearance "c"

Out of specification Replace
the oil pump.

Checking the oil pump


1. Inner rotor

2. Outer rotor

3. Oil pump housing


3. Check:

Oil pump operation Rough movement Repeat steps (1)
and (2) or replace the defective part(s).

Checking the oil pump


    Oil pump
    ...

    Assembling the oil pump
    1. Lubricate: Oil pump inner rotor Oil pump outer rotor Oil pump driven gear (with the recommended lubricant) 2. Install: Oil pump outer rotor Oil pump inner rotor "1" Oil pump dr ...

    Other materials:

    Checking the spark plug
    1. Remove: Right side cover Refer to "GENERAL CHASSIS" on page 4-1. 2. Disconnect: Spark plug cap 3. Remove: Spark plug CAUTION:Before removing the spark plug, blow away any dirt accumulated in the spark plug well with compressed air to prevent it from falling ...

    Ecu self-diagnostic function
    The ECU is equipped with a self-diagnostic function in order to ensure that the fuel injection system is operating normally. If this function detects a malfunction in the system, it immediately operates the engine under substitute characteristics and illuminates the engine trouble warning li ...

    Adjusting the valve clearance
    The following procedure applies to all of the valves. NOTE: Valve clearance adjustment should be made on a cold engine, at room temperature. When the valve clearance is to be measured or adjusted, the piston must be at top dead center (TDC) on the compression stroke. 1. Remove: ...

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