Yamaha YZF-R125 Service Manual: Checking the camshaft

Yamaha YZF-R125 Service Manual / Engine / Camshaft / Checking the camshaft

1. Check:

  • Camshaft lobes Blue discoloration/pitting/scratches 
    Replace the camshaft.

2. Measure:

  • Camshaft lobe dimensions "a" and "b" Out of specification Replace
    the camshaft.

Checking the camshaft


3. Check:

Camshaft oil passage Obstruction Blow out with
compressed air.

    Camshaft
    ...

    Checking the rocker arms and rocker arm shafts
    The following procedure applies to all of the rocker arms and rocker arm shafts. 1. Check: Rocker arm Damage/wear Replace. 2. Check: Rocker arm shaft Blue discoloration/excessive wea ...

    Other materials:

    Ignition circuit cut-off system
    The ignition circuit cut-off system (comprising the sidestand switch, clutch switch and neutral switch) has the following functions. It prevents starting when the transmission is in gear and the sidestand is up, but the clutch lever is not pulled. It prevents starting when the t ...

    Troubleshooting details
    This section describes the measures per fault code number displayed on the FI diagnostic tool. Check and service the items or components that are the probable cause of the malfunction following the order given. After the check and service of the malfunctioning part have been completed, re ...

    Checking the shift forks
    The following procedure applies to all of the shift forks. 1. Check: Shift fork cam follower "1" Shift fork pawl "2" Bends/damage/scoring/wear Replace the shift fork. 2. Check: Shift fork guide bar Roll the shift fork guide bar on a flat surface. Bends  Replace. ...

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