Yamaha 2008 Raptor 250, Service Manual

Page: 302 / 311

ELEC
7-35
EBS01083
3. The carburetor heater fails to come on.
1. Thermo switch
• Disconnect the thermo switch from the wire-
harness.
• Connect the pocket tester (
Ω ×
1) to the
thermo switch lead.
Tester positive probe
→
black
Tester negative probe
→
black
• Check the thermo switch for continuity at
the temperatures indicated below.
COOL DOWN
HEAT UP
• Does the thermo switch operated properly?
YES
NO
Replace the thermo
switch.
OFF
ON
11°C±3°C
(51.8°F±5.4°F)
16°C±3°C
(60.8°F±5.4°F)
2. Carburetor warmer
• Remove the carburetor heating element
from the carburetor.
• Connect the pocket tester (
Ω ×
1) to the car-
buretor heating element.
Tester positive probe
→
heating element
Tester negative probe
→
heating element body
• Measure the carburetor heating element
resistance.
Carburetor heating element resis-
tance:
6 ~ 12
Ω
(20°C)
• Is the carburetor heating element OK?
YES
NO
This circuit is OK. Replace the carbu-
retor warmer ele-
ment.
1
2
SIGNAL SYSTEM