Checking The Engine Oil Level - Yamaha XT250X Service Manual

Compression gauge
90890-03081
Engine compression tester
YU-33223
6. Measure:
Compression pressure
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Out of specification → Refer to steps (c) and
(d).
Standard compression pressure
1200 kPa (12.0 kg/cm
Minimum compression pressure
1050 kPa (10.5 kg/cm
Maximum compression pressure
1300 kPa (13.0 kg/cm
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a. Set the main switch to "ON".
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
EWA12960
WARNING
To prevent sparking, ground the spark plug
lead before cranking the engine.
NOTE:
Make use the battery is fully charged when tak-
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ing measurements.
Make sure there is no compression leakage
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from the connecting section of the compres-
sion gauge.
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits → Eliminate.
d. If the compression pressure is below the min-
imum specification, pour a teaspoonful of en-
gine oil into the spark plug bore and measure
again.
Refer to the following table.
Compression pressure (with oil applied into the
cylinder)
Reading
Higher than without oil
Same as without oil
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7. Install:
Spark plug
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8. Connect:
Spark plug cap
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EAS20730
2
/300 rpm)

CHECKING THE ENGINE OIL LEVEL

1. Stand the vehicle on a level surface.
2
/300 rpm)
NOTE:
Place the vehicle on a suitable stand.
2 G
/300 rpm)
Make sure the vehicle is upright.
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2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Check:
Engine oil level
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The engine oil level should be between the
minimum level mark "a" and maximum level
mark "b".
Below the minimum level mark → Add the
recommended engine oil to the proper level.
3-10
Diagnosis
Piston ring(s) wear or
damage → Repair.
Piston, valves, cylinder
head gasket or pis-
ton possibly defec-
tive → Repair.
Spark plug
18 Nm (1.8 m•kg, 13 ft•lb)
b
a
ENGINE