Yamaha BT1100 2002 Service Manual page 342

• Immerse the thermo switch in the water 3.
• Check the thermo switch for continuity. Note
the temperatures while heating the water
with the temperature gauge 4.
Test step Water temperature
1 Less than 23 ± 3 °C
2 More than 23 ± 3 °C
3 More than 12 ± 4 °C
4 Less than 12 ± 4 °C
Test 1 & 2: Heat-up test
Test 3 & 4: Cool-down test
O : Continuity : No continuity
OFF
ON
Thermoswitch Thermoswitch
12 ± 4 °C 23 ± 3 °C
• Is the thermo switch OK?
YES
Replace the thermo
switch.
CARBURETOR HEATER SYSTEM
EASB0041
5. Carburetor heater
• Remove the carburetor heater from the car-
buretor body.
• Connect the pocket tester to the carburetor
heater.
Tester (+) lead
Tester (–) lead
• Measure the heater resistance.
Carburetor heater resistance:
Good
condition
• Is the carburetor heater OK?
O
O
EASB0042
6. Wiring
• Check the entire carburetor heater system's
wiring.
Refer to "CIRCUIT DIAGRAM".
• Is the carburetor heater system's wiring
properly connected and without defects?
Properly
or repair the carbure-
NO
tor heater system's
wiring.
7-48
ELEC
Heater terminal 1
Heater body 2
12 V 30 W: 6 ~ 10 at 20 °C (68 °F)
YES
Replace the carbure-
tor heater.
NO
connect The carburetor heater
system circuit is OK.
NO
YES