Checking Throttle Body Joint; Checking Fuel Line/Engine Oil Level - Yamaha YZ450F Owner's Service Manual

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. Install:
• Air filter element "1"
• Air filter guide "2"
• Binder
10. 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)
11. Install:
• Fuel tank bolt (front)
Fuel tank bolt (front):
9 Nm (0.9 m•kg, 6.5
ft•lb)
CHECKING THE TROTTLE BODY
JOINT
12. Remove:
• Seat
• Air scoop (left/right)
• Fuel tank
• Air filter
13. Check:
• Throttle body joint "1"
Cracks/damage → Replace.
14. 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.
• 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.
3-9
ENGINE
• 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.
Recommended brand:
YAMALUBE
Recommended engine
oil type
SAE10W-30, SAE 10W-
40, SAE10W-50, SAE
15W-40, SAE 20W-40 or
SAE 20W-50
Recommended engine
oil grade
API service SG type or
higher, JASO standard
MA