1D-2 Engine Mechanical:
Diagnostic Information and Procedures
Engine Mechanical Symptom Diagnosis
B827H11404001
Refer to “Engine Symptom Diagnosis in Section 1A
(Page 1A-1)”.
Compression Pressure Check
B827H11404002
The compression pressure reading of a cylinder is a
good indicator of its internal condition.
Periodic maintenance records kept at your dealership
should include compression readings for each
maintenance service.
NOTE
• Before checking the engine for
compression pressure, make sure that the
cylinder head nuts are tightened to the
specified torque values and the valves are
properly adjusted.
• Make sure that the battery is in fully-
charged condition.
1) Warm up the engine.
2) Remove the spark plug. Refer to “Spark Plug
Removal and Installation in Section 1H (Page 1H-
3)”.
3) Install the compression gauge with attachment to the
spark plug hole. Make sure that the connection is
tight.
Special tool
(A): 09915–64512 (Compression gauge)
(B): 09915–63311 (Compression gauge
attachment)
4) Keep the throttle lever in the fully-opened position.
5) Press the starter button and crank the engine for a
few seconds. Record the maximum gauge reading
as the cylinder compression.
Compression pressure specification
Low compression pressure can indicate any of
the following conditions:
• Excessively worn cylinder wall
• Worn piston or piston rings
• Piston rings stuck in grooves
• Poor valve seating
• Ruptured or otherwise defective cylinder head
gasket
6) After checking the compression pressure, reinstall
the removed parts.
11. Clamp
: Bind the rear brake cable with the clamp.
“H”: Pass the breather hose to outside of the cable.
(A)
(B)
I827H1140315-01
Standard
Approx. 1 000 kPa
(10.0 kgf/cm
2
, 142 psi)
(Automatic decompression actuated)
I827H1140226-01
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