Honda TRX450R Service Manual page 179

COOLING SYSTEM
REMOVAL
Remove the radiator cap.
Remove the drain bolt and sealing washer, and
drain the coolant from the system.
Loosen the hose band screws and disconnect the
bypass hose and radiator lower hose from the water
pump cover.
Remove the two bolts and water pump cover.
Remove the dowel pins and O-ring.
Loosen the water pump impeller.
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