Yamaha XZ550RJ 1982 Owner's Manual page 133

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1. If your motorcycle overheats
WARNING:
Do not remove the radiator cap especial-
ly when the engine and radiator are hot.
Scalding hot fluid and steam may be
blown out under pressure, which could
cause serious injury.
To open the radiator cap, remove the
radiator cover by removing the. four
screws. When the engine has cooled,
place a thick rag like a towel over the
radiator cap, slowly rotate the cap
counterclockwise to the detent. This
procedure allows any residual pressure
to escape. When the hissing sound has
stopped, press down on the cap while
turning counterclockwise and remove it.