Carburetor Heater Inspection - Yamaha TT-R90(P) Owner's Service Manual

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
1
(73.4
More than 23
2
(73.4
More than 12
3
(53.6
Less than 12
4
(53.6
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
Tester (+) probe
Carburetor heater terminal 1
Tester (–) probe
Carburetor heater body 2
Carburetor
heater resistance
6 ~ 10
20˚C (68 ˚F)
–
ELEC
3 ˚C
YES
5.4 ˚F)
3 ˚C
NO
5.4 ˚F)
4 ˚C
NO
7.2 ˚F)
4 ˚C
YES
7.2 ˚F)
Replace.
Tester selector
position
at
1
+