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Honda CRF450RL 2021 Owner's Manual & Off-Road Handbook page 44

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Maintenance
THROTTLE OPERATION
Check for smooth operation of the throttle and that it
returns automatically to the fully closed position from any
open position and from any steering position.
Check the throttle cables and replace them if they are
deteriorated, kinked or damaged.
Replace the throttle cables if throttle operation is not
smooth.
Measure the freeplay at the throttle grip flange.
FREEPLAY:3 – 6 mm (0.1 – 0.2 in)
Throttle grip freeplay can be adjusted at either end of the
throttle cable.
Minor adjustment is made with the grip side adjuster [1].
Adjust the freeplay by loosening the grip side adjuster
lock nut [2] and turning the adjuster.
Turning the grip side adjuster in direction (–) will
decrease freeplay and turning it in direction (+) will
increase freeplay.
After adjustment, tighten the grip side adjuster lock nut
securely while holding the adjuster.
Recheck the throttle operation.
If you cannot obtain the correct freeplay with grip side
adjuster, turn it all the way in and then turn it out one turn.
Make the major adjustment with the throttle body side
adjuster.
(+)
[1]
2-18
3 – 6 mm
(0.1 – 0.2 in)
[2]
(–)
Major adjustment is made with the throttle body side
adjuster [1].
Adjust the freeplay by loosening the throttle cable
adjuster lock nut [2] and turning the throttle body side
adjuster.
Turn the throttle body side adjuster in direction (–) to
decrease freeplay, and in direction (+) to increase
freeplay.
After adjustment, tighten the throttle cable adjuster lock
nut to the specified torque while holding the throttle body
side adjuster.
TORQUE: 4.0 N·m (0.4 kgf·m, 3.0 lbf·ft)
Recheck the throttle operation.
(–)
[2]
AIR CLEANER
Remove the seat 1-3.
Remove the bolts [1].
Release the air cleaner lid spring [2].
Remove the air cleaner lid [3].
[1]
[1]
(+)
[3]
[2]

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Crf450l