Yamaha XZ550RJ 1982 Service Manual page 184

WARNING:
When the engine temperature gauge needle
swings into the red zone, stop grounding of the
lead (green/red) immediately.)
3. When the engine temperature gauge needle
swings to the red zone, the engine tempera-
ture gauge is in good condition but the
thermo-unit is considered to be faulty. Re-
place the thermo-unit. If the needle fails to
swing to the red zone, replace the engine
temperature gauge.
4. After replacing the thermo-unit, tighten it to
specification.
Tightening torque:
15 Nm (1.5m-kg, 11.0ft-lb)
CAUTION:
After replacing the thermo-unit, check the cool-
ant level in the radiator and also check for any
leakage.
184