ENGINE (YP250R)
3-26
3. Start the engine, warm it up for several min-
utes, and then turn it off.
4. Disconnect:
• Spark plug cap
5. Remove:
• Spark plug
NOTICE
ECA37P1016
Before removing the spark plug, use com-
pressed air to blow away any dirt accumulat-
ed in the spark plug well to prevent it from
falling into the cylinder.
6. Install:
• Compression gauge “1”
7. Measure:
• Compression pressure
Out of specification → Refer to steps (c) and
(d).
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
WARNING
EWA37P1002
To prevent sparking, ground the spark plug
lead before cranking the engine.
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.
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
8. Install:
• Spark plug
9. Connect:
• Spark plug cap
10.Install:
• Storage box
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20740
CHECKING THE ENGINE OIL LEVEL
1. Stand the vehicle on a level surface.
IP
• Place the vehicle on the centerstand.
• Make sure the vehicle is upright.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• Dipstick “1”
4. 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.
Compression gauge
90890-03081
Engine compression tester
YU-33223
Standard compression pressure
(at sea level)
1400 kPa/500 r/min (14.0
kgf/cm²/500 r/min, 199.1 psi/500
r/min)
Minimum–maximum
1120–1570 kPa (11.2–15.7
kgf/cm², 159.3–223.3 psi)
1
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 ring(s) possi-
bly defective → Re-
pair.
T
R
.
.
Spark plug
18 Nm (1.8 m·kgf, 13 ft·lbf)
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