Yamaha XZ550RJ 1982 Service Manual page 181

*When the water begins boiling in tests 3 and 4,
stop heating the water and allow it to cool down,
then start the test again.
3. Install the thermostatic switch, and torque
the switch to specification.
Tightening torque:
15NM (1.5 m-kg, 11 ft-lb)
Engine temperature gauge
An electronic temperature gauge is equipped to
indicate the engine operating temperature. This
engine temperature gauge consists of a tempera-
ture indicator, a thermo-unit, and an indicator unit
mounted on the T-joint.
Inspection
1. The meter reading and the temperature
show the following relationship:
2. Remove the engine temperature gauge
from the instrument panel and measure the
resistance of the heat coil. If the resistance
measured is out of specification, replace the
engine temperature gauge.
Heat coil resistance:
55±2nat20°C(68°F)
181