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 relays
    Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, replace the relay. 1. Disconnect the relay from the wire harness. 2. Connect the pocket tester ( × 1) and battery (12 V) to the relay terminal as shown. Check the relay operation. Out ...

    Checking the camshaft sprocket and timing chain guide
    1. Check: Camshaft sprocket More than 1/4 tooth wear "a" Replace the camshaft sprocket, timing chain and crankshaft as a set. a. 1/4 tooth b. Correct 1. Timing chain roller 2. Camshaft sprocket 2. Check: Timing chain guide (exhaust side) Damage/wear Replace. ...

    Checking and charging the battery
    WARNINGBatteries generate explosive hydrogen gas and contain electrolyte which is made of poisonous and highly caustic sulfuric acid. Therefore, always follow these preventive measures: Wear protective eye gear when handling or working near batteries. Charge batt ...

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