Yamaha YZF-R125 Service Manual: Separating the crankcase

Yamaha YZF-R125 Service Manual / Engine / Crankcase / Separating the crankcase

1. Remove:

  • Crankcase bolts

NOTE:

Loosen each bolt 1/4 of a turn at a time, in stages and in the proper sequence as shown.

Separating the crankcase


A. Right crankcase

B. Left crankcase

2. Turn:

  • Shift drum segment

NOTE:

Turn the shift drum segment "1" to the position shown in the illustration. In this position, the shift drum segment teeth will not contact the crankcase during crankcase separation.

Separating the crankcase


3. Remove:

  • Right crankcase
CAUTION:

Tap on one side of the crankcase with a softface hammer. Tap only on reinforced portions of the crankcase, not on the crankcase mating surfaces. Work slowly and carefully and make sure the crankcase halves separate evenly.

    Crankcase
    ...

    Checking the crankcase
    1. Thoroughly wash the crankcase halves in a mild solvent. 2. Thoroughly clean all the gasket surfaces and crankcase mating surfaces. 3. Check: Crankcase Cracks/damage Replace. Oil de ...

    Other materials:

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    The following procedure applies to all of the valves and related components. NOTE: Before removing the internal parts of the cylinder head (e.g., valves, valve springs, valve seats), make sure the valves properly seal. 1. Check: Valve sealing Leakage at the valve seat Check the valve ...

    Troubleshooting
    Any of the following fail to light: turn signal lights, brake light or indicator lights. The horn fails to sound. The fuel gauge fails to operate. The speedometer fails to operate. NOTE: Before troubleshooting, remove the following part(s): 1. Seats 2. Fuel tank 3. Left upper ...

    Checking the ignition timing
    NOTE: Prior to checking the ignition timing, check the wiring connections of the entire ignition system. Make sure all connections are tight and free of corrosion. 1. Remove: Rider seat Left lower side cowling Refer to "GENERAL CHASSIS" on page 4-1. 2. Remove: Timing mark acces ...

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