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CARBURETOR HEATING SYSTEM
6 - 8
Å The thermo switch circuit is open.
ı The thermo switch circuit is closed.
Test step Water temperature Continuity
Less than 23 ± 3 ˚C
1
(73.4 ± 5.4 ˚F)
More than 23 ± 3 ˚C
2
(73.4 ± 5.4 ˚F)
More than 12 ± 4 ˚C
3
(53.6 ± 7.2 ˚F)
Less than 12 ± 4 ˚C
4
(53.6 ± 7.2 ˚F)
Test steps 1 & 2: Heating phase
Test steps 3 & 4: Cooling phase
WARNING
Handle the thermo switch with special
G
care.
Never subject the thermo switch to
G
strong shocks. If the thermo switch is
dropped, replace it.
Check the thermo switch operation.
G
CARBURETOR HEATER INSPECTION
1. Inspect:
Carburetor heater resistance
G
Out of specification → Replace.
Tester (+) probe →
Carburetor heater terminal 1
Tester (–) probe →
Carburetor heater body 2
Carburetor
heater resistance
6 ~ 10 Ω at
20 ˚C (68 ˚F)
–
+
ELEC
YES
NO
NO
YES
Tester selector
position
Ω × 1
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