Johnson J2R4SUC 2007, Руководство по обслуживанию

Страница: 59 / 179

IGNITION AND ELECTRICAL
TROUBLESHOOTING
57
4
TROUBLESHOOTING
Perform the following ignition system tests when engine is hard to start to determine if the cause is in the
ignition or other system.
START
Check spark condition.
Check if spark plug is in good condition
(Refer to SPARK PLUG on page 46).
Disconnect the emergency stop switch
lead wire (black).
Check the air gap between the igniter unit
core and the flywheel.
Air gap: 0.02 in. (0.5 mm)
Check the igniter unit resistance
(Refer to Igniter Unit on page 58).
Primary: 0.5 to 0.9 k
Ω
Secondary: 10 to 16 k
Ω
Check the spark plug cap for any evidence
of a high-tension leak.
Check the spark plug cap resistance
(Refer to Spark Plug Cap on page 58).
Cap resistance: 4 to 6 k
Ω
OK
OK
OK
OK
No or weak sparks
No or weak sparks
Sparks
Check ignition timing by
using timing light.
(30° BTDC at 1900 RPM)
Sparks
NO
Out of Spec.
NO
Out of Spec.
NO
The cause is not in the ignition
system
Replace spark plug with a new one
Check and/or replace the emergency
stop switch (Refer to Engine Stop
Switch on page 58).
Adjust the air gap (Refer to Igniter Air
Gap on page 59).
Replace the spark plug cap.
Out of Spec.
Replace the igniter unit.
OK