3-4 IGNITION AND ELECTRICAL
IGNITION TROUBLESHOOTING
Perform the following ignition system tests when the engine is hard to start in order to determine if the cause
is in the ignition or another system.
START
Check the spark condition.
Check if the spark plug is in good condition.
(See page 2-7.)
Check the spark plug cap for any evidence
of the high-tension leak.
Disconnect the emergency/engine stop
switch lead wire (Black).
Check the igniter unit resistance.
(See page 3-5.)
[Primary: 0.5 – 0.9 Ω]
[Secondary: 10 – 16 kΩ]
Check the spark plug cap resistance.
(See page 3-5.)
[Cap resistance: 4 – 6 kΩ]
Check the air gap between the igniter unit
core and the flywheel.
[Air gap: 0.5 mm]
OK
OK
OK
OK
OK
No or weak sparks
No or weak sparks
Check the ignition timing by using
the timing light. [Approx. BTDC 30˚]
The cause will not be in the ignition
system.
Not good
Not good
Not good
Sparks
Out of spec.
Out of spec.
Out of spec.
Replace the spark plug with a new one.
Check and/or replace the emergency/
engine stop switch. (See page 3-6.)
Adjust the air gap. (See page 3-5.)
Replace the spark plug cap.
Replace the igniter unit.
Sparks
OK
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