IGNITION
90-826883 R2 JUNE 1998
Page 2A-7
Electronic Spark Advance
20/25 OUTBOARDS SERIAL NUMBER:
USA 0G044027 THRU 0G437999
BELGIUM 09807909 THRU 09926999
20 JET OUTBOARDS
USA 0G044027 THRU 0G760299
BELGIUM 09807909 THRU 09016999
The spark timing is controlled by an electronic circuit within the engine switch box. The
trigger assembly is positioned for maximum advance. (Refer to Set-Up Timing/Adjust-
ment Procedure) The electronic timing feature of the switch box retards the timing on start
up and at idle RPM. As the engine RPM increases the timing will advance. Maximum tim-
ing will occur at approximately 2500 RPM.
Mechanical Spark Advance
20/25 OUTBOARDS SERIAL NUMBER:
USA 0G438000 AND ABOVE
BELGIUM 09927000 AND ABOVE
20 JET OUTBOARDS SERIAL NUMBER
USA 0G760300 AND ABOVE
BELGIUM 09017000 AND ABOVE
The spark timing is changed (advanced/retarded) by rotating the trigger coil, which
changes the trigger coil position in relation to the magnets in the center hub of the fly-
wheel.
The stop switch (or ignition switch) shorts the output of the stator to ground to stop the
engine.
RPM Limiter
The 20 JET RED stator ignition module contains a RPM limiter circuit which interrupts one
cylinder when RPM exceeds 6200
±
100 RPM.
Ignition Component Description
Trigger Coil
A single wound coil located under the flywheel. The trigger is charged by the center hub
flywheel magnet and sends a pulse voltage to an (SCR) switch located in the ignition
switch
box.
52642
a
a -
Trigger Coil
ELECTRONIC SPARK ADVANCE
The trigger is mounted in a fixed timing position.