Yamaha YZ450F(D) Owner's Service Manual page 65

8. Apply:
• Foam-air-filter oil or equivalent oil
to the element
Oil application quantify:
35 g
Squeeze out the excess oil. Element
should be wet but not dripping.
9. If the thin sheet (air filter element
2) is dirty with mud etc., clean the
thin sheet (air filter element 2) by
the following steps.
Cleaning steps:
a. Remove the air filter element 2
"1".
b. Clean the air filter element 2 with
solvent.
After cleaning, remove the remaining
solvent by squeezing the element.
Do not twist the element when
squeezing the element.
c. Inspect the air filter element 2.
Damage → Replace.
d. Install the air filter element 2.
10. Install:
• Air filter element "1"
• Air filter guide "2"
• Binder
11. Install:
• Mounting bolt for air filter case
cover
Mounting bolt for air filter
case cover:
5 Nm (0.5 m•kg, 3.6
ft•lb)
12. Install:
• Fuel tank bolt (front)
Fuel tank bolt (front):
9 Nm (0.9 m•kg, 6.5
ft•lb)
CHECKING THE THROTTLE BODY
JOINT
1. Remove:
• Seat
• Air scoop (left/right)
• Fuel tank
• Air filter
2. Check:
• Throttle body joint "1"
Cracks/damage → Replace.
3. Install:
• Air filter
• Fuel tank
• Air scoop (left/right)
• Seat
CHECKING THE FUEL LINE
1. Remove:
• Seat
• Fuel tank
• Air scoop (left/right)
• Air filter case
• Cover
2. Check:
• Fuel hose "1"
Cracks/damage → Replace.
Loose connection → Reconnect.
3. Install:
• Cover
• Air filter case
• Air scoop (left/right)
• Fuel tank
• Seat
CHECKING THE ENGINE OIL
LEVEL
1. Stand the machine on a level sur-
face.
3-9
ENGINE
• When checking the oil level make
sure that the machine is upright.
• Place the machine on a suitable
stand.
2. Start the engine, warm it up for
2–3 minutes at engine idling
speed, and then stop the engine
and wait approximately 1 minute.
3. Inspect:
• Oil level
Make sure that the engine oil level
is between the maximum level
line "a" and minimum level line "b"
shown for the oil level check win-
dow.
Above the upper limit "a"→Check
that no oil comes out when the
check bolt "1" for the oil quantity
upper limit is removed.
If any engine oil comes out, drain
it until its last drop is out.
Below the level mark "b" → Add
sufficient oil and idle run the en-
gine, and after stopping the en-
gine, recheck through the oil
inspection window that the oil is at
the specified level.
• Check the oil quantity within 5 min-
utes after the engine is shut off.
Over 5 minutes, idle the engine
again and recheck the oil quantity.
• Do not leave the check bolt for the
oil quantity upper limit removed.
Otherwise, the oil level drops with
time in the engine, allowing the oil
to flow out.
• Engine oil also luburicates the
clutch and the wrong oil types or
additives could cause clutch
slippage. Therefore, do not add
any chemical additives or use en-
gine oils with a grade of CD or
higher and do not use oils la-
beled "ENERGY CONSERVING
II".
• Do not allow foreign material to
enter the crankcase.