Yamaha YZF-R125 Service Manual: 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 accessing screw "1"

Checking the ignition timing


3. Lift the fuel tank. (Do not disconnect the fuel hose, fuel drain hose, and couplers.) Refer to "FUEL TANK" on page 7-1.

4. Connect:

  • Timing light "1"
  • Digital tachometer

Checking the ignition timing


5. Check:

  • Ignition timing

a. Start the engine, warm it up for several minutes, and then let it run at the specified engine idling speed.


b. Check that stationary pointer "a" in the generator cover is within the firing range "b" on the generator rotor.

Incorrect firing range → Check the ignition system.

Checking the ignition timing


NOTE:

The ignition timing is not adjustable.

6. Remove:

  • Digital tachometer
  • Timing light

7. Install:

  • Fuel tank Refer to "FUEL TANK" on page 7-1.

8. Install:

  • Timing mark accessing screw (along with the O-ring )

9. Install:

  • Left lower side cowling
  • Right side cover
  • Rider seat Refer to "GENERAL CHASSIS" on page 4-1.
    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 ...

    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 ...

    Other materials:

    Checking the water pump
    1. Check: Water pump housing cover Water pump housing Cracks/damage Replace. Impeller shaft Cracks/damage/wear Replace. Bearing Rough movement Replace. Radiator outlet hose Cracks/damage Replace. ...

    Checking the steering head
    1. Wash: Bearings Bearing races 2. Check: Bearings Bearing races Damage/pitting →Replace. 3. Replace: Bearings Bearing races a. Remove the bearing races from the steering head pipe with a long rod "1" and hammer. b. Remove the bearing race from the lower bracket ...

    Removing the rear wheel (disc)
    1. Stand the vehicle on a level surface. WARNINGSecurely support the vehicle so that there is no danger of it falling over. 2. Elevate: Rear wheel NOTE: Place the vehicle on a suitable stand so that the rear wheel is elevated. 3. Remove: Rear brake caliper NOTE: ...

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