Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 103 / 398

ENGINE
3-15
8. Install:
• Oil filler cap
9. Check:
• Oil level
Refer to “CHECKING THE ENGINE OIL
LEVEL” on page 3-13.
10.Check:
• Engine oil pressure
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a. Slightly loosen the oil pressure check bolt “1”.
WARNING
EWA19120
When the engine is started with the check
bolt removed, oil will spout; therefore, al-
ways loosen it before the checkup.
b. Start the engine and keep it idling until oil
starts to seep from the oil pressure check
bolt.
WARNING
EWA19130
Always keep the engine idling speed during
the checkup without increasing the engine
speed.
NOTICE
ECA25840
If no engine oil seeps out after one minute,
immediately turn the engine off so it will not
seize.
c. If no engine oil seeps out, check the engine
oil for leaks, and the engine oil passage and
the oil pump for damage.
d. Check the oil pressure again.
e. Tighten the oil pressure check bolt.
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EAM30336
ADJUSTING THE ENGINE IDLING SPEED
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 increase 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.
1. Start the engine, and warm this up until the oil
has reached the specified temperature.
2. Attach the tester with temperature probe “1”
to the oil drain bolt.
3. Install:
•
Digital tachometer
Engine oil quantity
Oil change
0.83 L (0.88 US qt, 0.73 Imp.qt)
With oil filter removal
0.85 L (0.90 US qt, 0.75 Imp.qt)
Quantity (disassembled)
1.10 L (1.16 US qt, 0.97 Imp.qt)
1
Oil pressure check bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Engine oil temperature
70–80

C (158–176

F)
T
R
.
.
1