Yamaha YZF-R125 Service Manual: Checking the horn

1. Check:

Horn resistance Out of specification Replace.

a. Disconnect the horn connectors from the horn terminals.

b. Connect the pocket tester ( × 1) to the horn terminals.

  • Positive tester probe
    horn terminal "1"
  • Negative tester probe
    horn terminal "2"

Checking the horn

c. Measure the horn resistance.

2. Check:

Horn sound Faulty sound Adjust or replace.

a. Connect a battery (12 V) to the horn.

b. Turn the adjusting screw in direction "a" or "b" until the specified horn sound is obtained.

Checking the horn

    Checking the rectifier/regulator
    1. Check: Rectifier/regulator output voltage Out of specification → Replace the rectifier/ regulator. a. Set the engine tachometer to the spark plug lead. b. Connect the pocket tester ...

    Checking the fuel sender
    1. Drain the fuel from the fuel tank. 2. Check: Fuel sender resistance Out of specification → Replace the fuel sender. a. Connect the pocket tester ( × 10) to the fuel sender c ...

    Other materials:

    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: ...

    Electrical components
    1. Main switch 2. Clutch switch 3. Front brake light switch 4. Ignition coil 5. Throttle body sensor assembly (intake air pressure sensor, intake air temperature sensor, throttle position sensor) 6. FID (fast idle solenoid) 7. Rectifier/regulator 8. Lean angle sensor 9. Starting circui ...

    Outline of the fi system
    The main function of a fuel supply system is to provide fuel to the combustion chamber at the optimum air-fuel ratio in accordance with the engine operating conditions and the atmospheric temperature. In the conventional carburetor system, the air-fuel ratio of the mixture that is supplied t ...

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