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Honda CRF450RL 2021 Owner's Manual & Off-Road Handbook page 105

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After assembling the fork damper, perform following
procedure to breed the air from the fork damper:
Make sure that the compression damping adjuster is in
the full soft position.
Check the piston rod [1] sliding surface for damage.
Apply recommended fork oil to the piston rod sliding
surface.
Hold the fork damper [2] in an upright position and pump
the fork piston rod 100 mm (3.9 in) slowly, several times.
[1]
Cover the piston rod [1] end to prevent damage.
Cover the fork damper oil holes with shop towel [2].
Blow out any extra fork oil in the fork damper [3] by fully
stroking the piston rod.
• Be careful not to bend or damage the piston rod when
the piston rod is stroked.
Repeat the above process until the extra fork oil does not
overflow.
• By doing this procedure, about 5 cm
Imp oz) of fork oil will be drained from the fork damper
through the oil holes.
3
This will cause 243 cm
oil to be left in the fork damper.
[2]
[3]
[2]
100 mm (3.9 in)
3
(0.2 US oz, 0.2
(8.2 US oz, 8.6 Imp oz) of fork
[1]
Drain the extra fork oil from the oil holes [1] of the fork
damper [2].
Blow out the oil of the fork damper spring chamber with
compressed air from the oil hole [1] of the fork damper.
Wipe off the oil completely from the fork damper
Maintenance
[2]
[1]
[1]
2-79

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Crf450l