cooling YAMAHA TTR90 2003 Owners Manual

6 - 17
–+ELECCARBURETOR HEATING SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
Couplers and leads connection
Rust/dust/looseness/short-circuit →
Repair or replace.
THERMO SWITCH INSPECTION
1. Inspect:
Thermo switch operation
Faulty operation → Replace.
Inspection steps:
Remove the thermo switch.
Connect the pocket tester to the thermo
switch coupler as shown.
Tester (+) lead → Black 1
Tester (–) lead → Black 2
Immerse the thermo switch in a container
filled with water 3.
Place a thermometer 4 in the water.
Slowly heat the water, and then let it cool to
the specified temperature as indicated in
the table.
Check the thermo switch for continuity at
the temperatures indicated in the table.
ÅThe thermo switch circuit is open.
ıThe thermo switch circuit is closed.
Test step Water temperature Continuity
1Less than 16 ± 3 ˚C
(60.8 ± 5.4 ˚F)YES
2More than 16 ± 3 ˚C
(60.8 ± 5.4 ˚F)NO
3More than 11 ± 3 ˚C
(51.8 ± 5.4 ˚F)NO
4Less than 11 ± 3 ˚C
(51.8 ± 5.4 ˚F)YES
Test steps 1 & 2: Heating phase
Test steps 3 & 4: Cooling phase