Yamaha XV16AL Service Manual page 431

Å The thermo switch circuit is open.
ı The thermo switch circuit is closed.
Test step Water temperature
7
1
2
3
4
Test steps 1 & 2: Heating phase
Test steps 3 & 4: Cooling phase
CARBURETOR HEATING SYSTEM
Continu-
Less than 23 ± 3 ˚C
(73.4 ± 5.4 ˚F)
More than 23 ± 3 ˚C
(73.4 ± 5.4 ˚F)
More than 12 ± 4 ˚C
(53.6 ± 7.2 ˚F)
Less than 12 ± 4 ˚C
(53.6 ± 7.2 ˚F)
WARNING
WARNING
• Handle the thermo switch with special
care.
• Never subject the thermo switch to
strong shocks. If the thermo switch is
dropped, replace it.
• Does the thermo switch operate prop-
erly?
5.Carburetor heater
• Remove the carburetor heater from the
carburetor.
• Connect the pocket tester to the carbure-
tor heater as shown.
Tester positive probe →
Tester negative probe →
ity
YES
• Measure carburetor heater resistance.
NO
Carburetor heater resistance
NO
• Is the carburetor heater OK?
YES
7 - 53
ELEC
YES
Replace the thermo
switch.
carburetor heater terminal 1
carburetor heater body 2
12 V 30 W: 6 ~ 10 Ω at 20˚C (68˚F)
YES
Replace the carbu-
retor heater.
– +
NO
NO