Yamaha YZ450F 2021, Owner'S Service Manual

Page: 89 / 368

ENGINE
3-13
•
Side cover (left/right)
Refer to “GENERAL CHASSIS” on page 4-1.
EAM30224
CHECKING THE ENGINE OIL LEVEL
1. Stand the vehicle upright on a level surface.
2. Start the engine, warm this up for 2–3 min-
utes, and then stop the engine and wait about
1 minute.
3. Check:
• Oil level
Make sure that the engine oil level is above
the minimum level mark “a” shown for the oil
level check window “1”, and that the engine
oil does not come out by removing the oil
check bolt “2”.
The minimum level mark “a” or below

Add
the engine oil until its level exceeds the mini-
mum level mark “a”.
Engine oil coming out of the oil check bolt

Drain it until its last drop is out.
NOTICE
ECA24290
• Since engine oil also lubricates the clutch,
the wrong oil types or additives could
cause clutch slippage. Therefore, do not
add any chemical additives.
• Do not allow foreign material to enter the
crankcase.
EAM30225
CHANGING THE ENGINE OIL
Stand the vehicle upright on a level surface.
1. Start the engine, warm this up for several
minutes, and then stop the engine and wait
about 5 minutes.
TIP
This model is equipped with an engine auto-stop
system. The engine stops automatically if left
idling for 7 minutes. If the engine stops, push the
start switch to restart the engine.
2. Place an oil pan under the drain bolt.
3. Remove:
•
Oil filler cap “1”
• Drain bolt (with gasket) “2”
4. If the oil filter element is also to be replaced,
perform the following procedure.
a. Remove the oil filter element cover “1” and
oil filter element “2”.
b. Replace the new O-ring “3”.
Recommended brand
YAMALUBE
SAE viscosity grades
10W-40, 10W-50, 15W-40, 20W-
40 or 20W-50
Recommended engine oil grade
API service SG type or higher,
JASO standard MA
1
2
a
1
2