Yamaha VMX12H Supplementary Service Manual page 209

COOLANT
COOLANT REPLACEMENT
Do not remove the radiator cap when the
engine and radiator are hot. Scalding hot fluid
and steam may be blown out under pressure,
which could cause serious injury. When the
engine has cooled, open the radiator cap by the
fo I lowing procedure :
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
1. Place a receptacle under the coolant drain
bolt.
2.
Remove:
*Cover (right)
cover
Radiator cap
*Feed hose (reservoir tank)
3.
Align:
drain valve "ON"
match mark on drain valve housing
4. Remove:
*Drain bolt
Drain the coolant.
it.
mark with
4-2