Yamaha XG250, Service Manual

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ENGINE
3-10
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7. Install:
●
Spark plug
8. Connect:
●
Spark plug cap
EAS20730
CHECKING THE ENGINE OIL LEVEL
1. Stand the vehicle on a level surface.
NOTE:
●
Place the vehicle on a suitable stand.
●
Make sure the vehicle is upright.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Check:
●
Engine oil level
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.
NOTE:
Before checking the engine oil level, wait a few
minutes until the oil has settled.
CAUTION:
ECA4D601
●
Engine oil also lubricates the clutch and
the wrong oil types or additives could
cause clutch slippage. Therefore, do not
add any chemical additives or use engine
oils with a grade of CD “a” or higher and
do not use oils labeled “ENERGY CON-
SERVING II” “b”.
●
Do not allow foreign materials to enter the
crankcase.
4. Start the engine, warm it up for several min-
utes, and then turn it off.
5. Check the engine oil level again.
NOTE:
Before checking the engine oil level, wait a few
minutes until the oil has settled.
EAS20810
CHANGING THE ENGINE OIL
1. Start the engine, warm it up for several min-
utes, and then turn it off.
2. Place a container under the engine oil drain
bolt.
Compression pressure (with oil applied into the
cylinder)
Reading Diagnosis
Higher than without oil
Piston ring(s) wear or
damage
→
Repair.
Same as without oil
Piston, valves, cylin-
der head gasket or
piston possibly
defective
→
Repair.
Spark plug
18 Nm (1.8 m•kg, 13 ft•lb)
T
R
.
.
b
a
Type
SAE10W30 or SAE10W40 or
SAE15W40 or SAE20W40 or
SAE20W50
●
Recommended engine oil grade
API service SE, SF, SG type or
higher
-20 -10 0 10 20 30 40 50 ßC
SAE 10W-30
SAE 15W-40
SAE 20W-40
SAE 20W-50
SAE 10W-40