Adjusting The Engine Idling Speed - Yamaha YZ450FF 1SL-28199-11 Owner's Service Manual

1
2 New
d. Install the oil strainer.
Oil strainer bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
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6. Install:
• Gaskets
New
• Drain bolt
Drain bolt
20 Nm (2.0 m·kgf, 14 ft·lbf)
7. Pour the specified amount of engine oil into
the oil filler cap hole.
Engine oil quantity
With oil filter element replace-
ment
0.69 L (0.73 US qt, 0.61 Imp.qt)
Quantity (disassembled)
0.95 L (1.00 US qt, 0.84 Imp.qt)
8. Install:
• Oil filler cap
9. Check:
• Oil level
Refer to "CHECKING THE ENGINE OIL
LEVEL" on page 3-14.
10.Check:
• Engine oil pressure
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a. Slightly loosen the oil pressure check bolt
"1".
EWA
WARNING
When the engine is started with the check
bolt removed, oil will spout; therefore, al-
ways loosen it before the checkup.
1
Start the engine and keep it idling until oil
starts to seep from the oil pressure check
bolt.
EWA
WARNING
Always keep the engine idling speed during
the checkup without increasing the engine
speed.
ECA
NOTICE
If no engine oil seeps out after one minute,
immediately turn the engine off so it will not
seize.
b. If no engine oil seeps out, check the engine
oil for leaks, and the engine oil passage and
the oil pump for damage.
c. Check the oil pressure again.
d. Tighten the oil pressure check bolt.
Oil pressure check bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
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ADJUSTING THE ENGINE IDLING SPEED

EAS1SL5089
TIP
• Because the air pressure is lower at high alti-
tudes, the air-fuel mixture will become richer.
If the idling speed is low, turn the starter knob/
idle screw a few clicks counterclockwise to in-
crease the speed before the adjustment.
• Before adjusting the engine idling speed,
make sure that the air filter element is not
clogged, the engine compression is proper,
and the throttle grip free play is proper.
• Adjust the engine idling speed with the starter
knob/idle screw pushed in completely.
3-16
ENGINE