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Honda CRF450RL 2021 Owner's Manual & Off-Road Handbook page 58

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Maintenance
Remove the tensioner holder [1].
Install the cam chain tensioner lifter bolt [2] with a new
sealing washer [3].
Tighten the cam chain tensioner lifter bolt securely.
Rotate the camshaft by rotating the crankshaft clockwise
several times.
Recheck the valve clearance 2-24.
Install the following:
– Spark plug 2-23
– Cylinder head cover 2-24
– Crankshaft hole cap 2-24
[1]
2-32
ENGINE OIL
ENGINE OIL LEVEL INSPECTION
Start the engine and let it idle for 3 minutes.
Stop the engine and wait 3 minutes.
Support the motorcycle upright on a level surface.
Remove the oil filler cap/dipstick [1] and wipe the oil with
a clean cloth.
Insert the oil filler cap/dipstick without it is screw in,
remove it and check the oil level.
If the oil level is below or near the lower level line [2] on
the oil filler cap/dipstick, add the recommended engine oil
to the upper level line [3] through the oil filler hole.
RECOMMENDED ENGINE OIL:
[2]/[3]
Pro Honda GN4 4-stroke oil (U.S.A. & Canada) or
equivalent motorcycle oil
API service classification: SG or higher
JASO T903 standard: MA
Viscosity: SAE 10W-30
• Do not use API SH or higher 4-stroke engine oils
displaying a circular API "energy conserving" or
"resource conserving" service label on the
container. They may affect lubrication.
Check that the O-ring [4] is in good condition, replace it if
necessary.
Apply engine oil to the O-ring.
Reinstall the oil filler cap/dipstick.
NOT RECOMMENDED
RECOMMENDED
[1]
[3]
[2]
[4]

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Crf450l