Yamaha TZ250M1 Owner's Service Manual page 259

THERMO UNIT SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
• Couplers and leads connection
Rust/ Dust/ Looseness/Short-circuit ≥
Repair or replace.
EC6A2000
THERMO UNIT INSPECTION
1. Drain the cooling water.
2. Remove:
• Thermo unit 1
3. Immerse the thermo unit with a tester lead
connected in a container containing cooling
(tap) water 1 down to the upper threaded
portion a.
2 Water temperature gauge
3 Poket tester
4. Inspect:
• Thermo unit resistance
Measure the resistance while gradually
heating the cooling water.
Out of specification ≥ Replace .
Cooling
water
temperature resistance position
50˚C (122˚F) 9.72~11.4 kΩ
80˚C (176˚F) 3.41~4.01 kΩ
NOTE:
Do not allow the thermo unit to contact the test
container bottom.
6-15
ELEC
Thermo Tester
unit selector
kΩ X X 1