Yamaha RAPTOR YFM125RA, Service Manual, Page: 288 / 300

ELECTRICAL COMPONENTS
7-41
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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.
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)
WARNING
EWA13830
• 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.
Step 1 and 2: Heating phase
Step 3 and 4: Cooling phase
3. Install:
• Thermo switch
EAS28310
CHECKING THE CARBURETOR WARMER
1. Check:
• Carburetor warmer resistance
Out of specification
→
Replace.
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”
• Positive tester probe
Black “1”
• Negative tester probe
Black “2”
Test step Coolant temperature
Continu-
ity
1
Less than 13–19
°
C
(55.4–66.2
°
F)
YES
2
More than 13–19
°
C
(55.4–66.2
°
F)
NO
3
More than 8–14
°
C
(46.4–57.2
°
F)
NO
4
Less than 8–14
°
C
(46.4–57.2
°
F)
YES
A. Heating phase
B. Cooling phase