Checking The Horn; Checking The Fuel Sender - Yamaha WR125R 2009 Service Manual

Charging voltage
14 V at 5000 r/min
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a. Set the engine tachometer to the spark plug
lead.
b. Connect the pocket tester (DC 20 V) to the
rectifier/regulator coupler as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
red "1"
• Negative tester probe →
ground
c. Start the engine and let it run at approximate-
ly 5000 r/min.
d. Measure the charging voltage.
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EAS28180

CHECKING THE HORN

1. Check:
• Horn resistance
Out of specification → Replace.
Coil resistance
1.06–1.11 Ω at 20 °C (68 °F)
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a. Disconnect the horn connectors from the
horn terminals.
b. Connect the pocket tester (Ω × 1) to the horn
terminals.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
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W R
W W
1
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ELECTRICAL COMPONENTS
• Positive tester probe →
horn terminal "1"
• Negative tester probe →
horn terminal "2"
MMM
c. Measure the horn resistance.
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2. Check:
• Horn sound
Faulty sound → Adjust or replace.
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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.
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EAS28230

CHECKING THE FUEL SENDER

1. Disconnect:
• Fuel pump coupler
• Fuel hose
(from the fuel pump)
2. Remove:
MMM
• Fuel tank
3. Remove:
• Fuel pump assembly
(from the fuel tank)
4. Check:
• Fuel sender resistance
Out of specification → Replace the fuel pump
assembly.
8-73
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a b
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1
2
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M MMM M MMM
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