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