Yamaha YZF-R125, Service Manual

Page: 83 / 356

ENGINE
3-10
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9. Remove:
• Extension
• Compression gauge
10.Install:
• Spark plug
11.Connect:
• Spark plug cap
• Coolant temperature sensor coupler
12.Install:
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
13.Install:
• Right upper side cowling
• Rider seat
Refer to “GENERAL CHASSIS” on page 4-1.
EAS28920
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.
• Do not screw the engine oil filler cap (dipstick)
“1” in when checking the oil level.
CAUTION:
ECA5D71027
• 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” “c” or higher and do not use
oils labeled “ENERGY CONSERVING II”
“d”.
• Do not allow foreign materials to enter the
crankcase.
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 defec-
tive
→
Repair.
T
R
.
.
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
Type
SAE 10W-30, SAE 10W-40, SAE
15W-40, SAE 20W-40 or SAE
20W-50
Recommended engine oil grade
API service SG type or higher,
JASO standard MA
1
1
b
a
-20 -10 0 10 20 30 40 50 ˚C
SAE 10W-30
SAE 15W-40
SAE 20W-40
SAE 20W-50
SAE 10W-40
SAE 10W-50
c
d
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