Yamaha YZ250(W)/W1 Owner's Service Manual page 148

COOLANT REPLACEMENT
cC
Take care so that coolant does not splash
on painted surfaces. If it splashes, wash it
away with water.
1. Place a container under the engine.
2. Remove:
9 Coolant drain bolt 1
3. Remove:
9 Radiator cap
Drain the coolant completely.
4. Clean:
9 Cooling system
Thoroughly flush the cooling system with
clean tap water.
5. Install:
9 Copper washer
9 Coolant drain bolt
6. Fill:
9 Radiator
9 Engine
To specified level.
3-6
INSP
ADJ
10 Nm (1.0 m•kg, 7.2 ft•lb)
Recommended coolant:
High quality ethylene glycol
anti-freeze containing
anti-corrosion for
aluminum engine
Coolant 1 and water
(soft water) 2 mixing ratio:
50%/50%
Coolant capacity:
1.20 L (1.06 Imp qt, 1.27 US qt)