IGNITION
90-826883 R2 JUNE 1998 Page 2A-13
Ignition Troubleshooting
WARNING
DANGER -HIGH VOLTAGE/SHOCK HAZARD! Do not touch ignitioncomponents
and/or metal test probes while engine is running and/or being “cranked”. STAY
CLEAR OF SPARK PLUG LEADS. To assure personal safety, each individual
spark plug lead should be grounded to engine.
WARNING
When testing or servicing the ignition system, high voltage is present. DO NOT
TOUCH OR DISCONNECT any ignition parts while engine is running.
Ignition Diagnostic Procedures
TROUBLESHOOTINGTIP:Withenginerunning,useinductivetiminglighttocheckspark
advanceof eachcylinderasthrottleisopenedandclosed.Iftimingadvancesandretards
smoothly on each cylinder, ignition system is MOST LIKELY functioning properly
IMPORTANT: If outboard appears to have an ignition system failure, it is recom-
mended that before beginning in-depth troubleshooting:
a. Ensure that the engine is mechanically sound condition. (Fuel System, Cylinder
Compression etc.).
b. Check all engine ground leads for loose or corroded connections.
c. Disconnectandreconnectignition harnessconnectorsto verifypropercontinuity.
PROBLEM CORRECTION
1. No Spark or Weak Spark on Both Cylinders No Spark -- Trigger, Stator, Ignition Switch Box or
Bad Ground Connection from Switch Box to Block
Weak Spark -- Stator
2. No Spark or Weak Spark on 1 Cylinder Ignition Switch Box or Coil
3. Timing Fluctuates -- Note: It is normal for timing
to fluctuate 2° -3° @ Idle.
-- If engine RPM exceeds
5800, switch box will retard
timing from 25° BTDC to 15°
BTDC
--If engine RPM drops below
600, idle stabilizer in switch
box will advance timing to
as
high as 10° BTDC @ crank
ing speed of 300 RPM.
Shorted Trigger Wire or Ignition Switch Box
4. Timing will not Advance -- Note: If timing will not
advance on only
1 cylinder, check wir-
ing for shorted trigger wire
Defective Switch Box
5. Engine Misfires @ High RPM Defective Coil
Defective Switch Box
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