Yamaha XZ550RJ 1982 Owner's Manual page 81

1. Coolant reservoir tank cap
I. Bouchon du vase d'expansion
2. "FULL" level 2. Repere "FULL"
3. "LOW" level 3. Repere "LOW"
1. Tapa del tanque del refrigerante
2. Nivel "FULL"
3. Nivel "LOW"
-69-
Coolant
Check the coolant level in the reservoir tank
when the engine is cold. The coolant level is
satisfactory if it is between the "FU LL" and
"LOW" level on the tank. The coolant level
will vary with engine temperature. However,
if the level is on or below the "LOW" level,
add the tap water (soft water) until "FULL"
level. Change the coolant every two years.
( See page 125 for more detail.)
WARNING:
Do not remove the radiator cap when the
engine is hot.