2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 59Get this manual

2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 59

IGNITION AND ELECTRICAL IGNITION TROUBLESHOOTING
IGNITION TROUBLESHOOTING
Perform the following ignition system tests when engine is hard to start to determine if the cause is in the ignition or other systemCheck ignition timing by using timing light(Ignition timingBTDC)

Check spark condition

+ No or weak sparks

-=- =r-, SJ::pa k,-=-s

Check if the spark plug is in good condition NO (See page 2-10)

Repla ce the spark plug with new one

Back to 2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual