POWR
Power unit
5-3
62Y3A11
Symptom: Engine cracks, but will not start.
• Check the ignition system.
• Check the fuel system.
• Check the compression pressure of power unit.
Wet spark
plugs?
Does the
engine start?
Wet spark
plugs?
Out of specifi-
cation?
Out of specifi-
cation?
Check the condition of the spark
plugs.
Check the fuel system.
Failure in starting operation
Failure in starting operation
Check the fuel system.
Check the condition of the spark
plugs again.
Check the compression pres-
sure of the combustion chamber.
Check the ignition system out-
put peak voltage.
Check the valve
clearance.
WARNING
• Do not touch any of
the connections of
the spark gap tester
leads.
• Do not let sparks
leak out of the
removed spark plug
caps.
• Keep flammable
gas or liquids away,
since this test can
produce sparks.
Start the engine using dried or
new spark plugs.
Adjust the valve
clearance.
No
No
No
Yes
Yes
Yes
Yes
No
Yes
No
No
Check the ignition spark using the spark gap tester.
Below the
spark gap
specification?
Yes
Check the cylinder head,
cylinger body, and piston
assembly.
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