CHK
ADJ
3-16
MEASURING THE COMPRESSION PRESSURE
✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭✭
a. Set the main switch to “ON”.
b. With the throttle wide open and push the
“START” switch, then crank the engine until
the reading on the compression gauge sta-
bilizes.
w
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
minimum specification, pour a teaspoonful
of engine oil into the spark plug bore and
measure again.
Refer to the following table.
✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬
Compression pressure
(with oil applied into the cylinder)
Reading
Diagnosis
Piston ring(s) wear
Higher than with-
or damage
→
→
out oil
Repair.
Piston, valves, cyl-
Same as without
inder head gasket
oil
or piston possibly
defective
→
→
Repair.
1
6. Install:
9
compression gauge
1
7. Measure:
9
compression pressure
Out of specification
→
Refer to steps (c)
and (d).
Compression gauge
90890-03081
Compression pressure
(at sea level)
Minimum
490 kPa (4.9 kg/cm
2
, 70 psi)/at 500 r/min
Standard
560 kPa (5.6 kg/cm
2
, 80 psi)/at 500 r/min
Maximum
630 kPa (6.3 kg/cm
2
, 90 psi)/at 500 r/min
http://www.motorcycle.in.th
Summary of Contents for T135SE
Page 2: ...http www motorcycle in th ...
Page 6: ...http www motorcycle in th ...
Page 8: ...http www motorcycle in th ...
Page 10: ...http www motorcycle in th ...
Page 12: ...GEN INFO http www motorcycle in th ...
Page 22: ...SPEC http www motorcycle in th ...
Page 106: ...ENG http www motorcycle in th ...
Page 198: ...ENG http www motorcycle in th ...
Page 200: ...COOL http www motorcycle in th ...
Page 212: ...CARB http www motorcycle in th ...
Page 290: ...CHAS http www motorcycle in th ...
Page 292: ...ELEC http www motorcycle in th ...
Page 296: ...ELEC CHECKING SWITCH CONTINUITY 8 4 http www motorcycle in th ...
Page 340: ...ELEC http www motorcycle in th ...
Page 342: ...TRBL SHTG http www motorcycle in th ...
Page 346: ...TRBL SHTG http www motorcycle in th ...
Page 347: ...http www motorcycle in th ...
Page 348: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN http www motorcycle in th ...