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Honda CRF450RL 2021 Owner's Manual & Off-Road Handbook page 49

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Remove the bolt/washer [1].
Remove the following:
– Crankcase breather catch tank [2]
– Grommet A [3]
– Flange collar [4]
– Stay [5]
– Grommet B [6]
Remove the crankcase breather hose A [7] and B [8].
Installation is in the reverse order of removal.
TORQUE:
Left cylinder head hanger bolt:
54 N·m (5.5 kgf·m, 40 lbf·ft)
Left cylinder head hanger plate bolt:
32 N·m (3.3 kgf·m, 24 lbf·ft)
• Align the catch tank boss [9] with the grommet B on
the stay.
• Align the stay pin [10] with the hole [11] of the cylinder
head.
• Contact the battery negative (–) cable terminal tab on
the starter motor rear bracket.
• Tighten the left cylinder head hanger bolt first and then
hanger plate bolts.
• Route the wires and hoses properly as shown.
[9]
Front
[6]
[5]
[6]
[10]
[4]
[3]
[5]
[1]
[4]
[3]
[2]
[7]
[11]
[2]
[1]
[8]
SPARK PLUG
REMOVAL/INSTALLATION
Remove the fuel tank 2-10.
Disconnect the spark plug cap [1].
• Clean around the spark plug base with compressed
air before removing and be sure that no debris is
allowed to enter the combustion chamber.
Remove the spark plug [2] and inspect it for damage.
Inspect or replace as described in the maintenance
schedule 2-8.
Install and hand tighten the spark plug to the cylinder
head, then tighten the spark plug to the specified torque.
TORQUE: 22 N·m (2.2 kgf·m, 16 lbf·ft)
Connect the spark plug cap securely.
Install the fuel tank 2-10.
[1]
Maintenance
[2]
2-23

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