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Honda CRF450RL 2021 Owner's Manual & Off-Road Handbook page 71

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COOLANT REPLACEMENT
Remove the engine guard 1-7.
Support the motorcycle in an upright position on a level
surface.
Remove the water pump cover bolt (short) [1] and sealing
washer [2].
Remove the radiator cap [3] slowly.
The engine must be cool before removing the
radiator cap, or severe scalding may result.
Remove the air bleed bolt [4] from the left radiator.
Drain the coolant from the system by leaning the
motorcycle to the right and left several times.
Install the water pump cover bolt (short) with a new
sealing washer.
Tighten the water pump cover bolt (short) securely.
[3]
[1]/[2]
[4]
Fill the system with the recommended coolant through
the filler opening up to filler neck [1].
Fill the radiator reserve tank to the upper level line 2-
44.
Bleed air from the system as follows:
1. Shift the transmission into neutral.
Start the engine and let it idle for 2 – 3 minutes.
2. Snap the throttle 3 or 4 times to bleed air from the
system.
3. Stop the engine and add coolant up to the filler neck if
necessary.
4. Install the radiator cap securely.
5. Check the level of coolant in the radiator reserve tank
and fill to the upper level line if it is low 2-44.
• When air bleeding is insufficient, level of coolant in the
radiator reserve tank will decrease. If so, fill to the
upper level line with coolant.
[1]
Check that there are no coolant leaks.
Install the air bleed bolt and tighten it to the specified
torque.
TORQUE: 1.6 N·m (0.2 kgf·m, 1.2 lbf·ft)
Install the engine guard 1-7.
Maintenance
2-45

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Crf450l