Compression Pressure - Yamaha E60HWD Service Manual

Compression pressure

9 Consult this chart after the ignition and fuel systems have been checked.
Measure the compression
pressure.
Does the
pressure exceed
the specification
values?
No
Add a small amount of engine oil
into the cylinder through the
spark plug hole.
Does the
compression
pressure
increase?
No
Check the cylinder head gasket
and cylinder head for corrosion
or damage.
Replace if corrosion or damaged.
NOTE:
While restoring a damaged part, it is also necessary to trace and solve the cause of the damage.
69D5G11
(Refer to page 5-5)
Yes
Check ignition timing. Adjust as
necessary.
Check the piston, piston rings,
Yes
and cylinder bore for wear or
damage. Correct or replace if
worn or damaged.
(Refer to page 5-26)
Power unit
(Refer to page 3-9, 3-10)
(Refer to page 5-32, 5-34)
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