Checking The Thermo Switch; Checking The Carburetor Warmer - Yamaha RAPTOR YFM125RA Service Manual

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a. Set the digital tachometer to the ignition
coil.
b. Connect the pocket tester (AC 20 V) to the
battery terminal as shown.
Digital tachometer
90890-06760
YU-39951-B
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Red "1"
• Negative tester probe
Black "2"
c. Start the engine and let it run at approxi-
mately 5000 r/min.
d. Measure the charging voltage.
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EAS28270

CHECKING THE THERMO SWITCH

1. Remove:
• Thermo switch
(from the wire harness)
EWA13830
WARNING
• Handle the thermo switch with special
care.
• Never subject the thermo switch to strong
shocks. If the thermo switch is dropped,
replace it.
2. Check:
• Thermo switch continuity
Out of specification → Replace the
thermo switch.
ELECTRICAL COMPONENTS
• Positive tester probe
Black "1"
• Negative tester probe
Black "2"
Test step Coolant temperature
Less than 13–19 °C
1
(55.4–66.2 °F)
More than 13–19 °C
2
(55.4–66.2 °F)
More than 8–14 °C
3
(46.4–57.2 °F)
Less than 8–14 °C
4
(46.4–57.2 °F)
Step 1 and 2: Heating phase
Step 3 and 4: Cooling phase
A. Heating phase
B. Cooling phase
3. Install:
• Thermo switch
EAS28310

CHECKING THE CARBURETOR WARMER

1. Check:
• Carburetor warmer resistance
Out of specification → Replace.
7-41
Continu-
ity
YES
NO
NO
YES