6724 690 06 Rev. P KohlerEngines.com
Electrical System
A Oil Pressure Switch B Oil Sentry
™
(Green) C Spark Plug(s) D Kill
E Trigger F Ignition Module G
Flywheel Stator
Assembly
H
22, 25 HP Smart-
Spark
™
Ignition
I
Module Speed
Advance 22, 25 HP
J Brown K Yellow L
Yellow on Analog
SAMs Pink on Digital
SAMs
M
Rectifi er-Regulator
Connector
N Rectifi er-Regulator O Oil Sentry
™
Kill (Green) P
Solenoid Shift Starter
Assembly
Q Violet (B+) R
Alternate Ignition Kill
(–)
S Accessory Terminal (+) T White
U Ignition Kill V Smart-Spark
™
W Red X Carburetor
Y Solenoid Lead Z Intake Manifold Screw AA Black AB
Oil Sentry
™
Panel
Light/Remote Light
AC Oil Sentry
™
Light AD Connector AE Magneto AF Key Switch
AG Accessory AH Battery AI Starter AJ Ground
AK Key Switch Ground AL Rectifi er AM Blue/Red AN Battery Positive
AO Battery Negative AP Blue AQ Fuse AR Starter Solenoid Stud
AS Starter Solenoid Tang AT Black (Ground)
Smart-Spark
™
Advance Ignition System
SMART-SPARK
™
equipped engines utilize an electronic capacitive discharge ignition system with electronic spark
advance. A typical application consists of following components:
● 1 magnet assembly which is permanently affi xed to fl ywheel.
● 2 electronic capacitive discharge ignition modules which mount on engine crankcase.
● 1 spark advance module which mounts to engine shrouding.
● 1 12 volt battery which supplies current to spark advance module.
● 1 kill switch (or key switch) which grounds spark advance module to stop engine.
● 2 spark plugs.
Smart-Spark
™
Ignition Systems Tests
NOTE: Ignition tester must be used to test ignition on these engines. Use of any other tester can result in inaccurate
fi ndings. Battery on unit must be fully charged and properly connected before performing tests (a battery that
is hooked up or charged backward will crank engine but it won’t have spark). Be certain drive is in neutral and
all external loads are disconnected.
Special Tools Required:
● Hand tachometer.
● Ignition tester.
● Automotive timing light
● Multi-meter (digital).
Specifi cations Required:
● 0.76 mm (0.030 in.).
Test for Spark
NOTE: If 2 testers are available, testing can be performed simultaneously for both cylinders. However, if only 1 tester
is available, 2 individual tests must be performed. Side not being tested must have spark plug lead connected
or grounded. Do not crank engine or perform tests with 1 spark plug lead disconnected and not grounded, or
permanent system damage may occur.
1. With engine stopped, disconnect 1 spark plug lead. Connect spark plug lead to post terminal of spark tester and
attach tester clip to a good engine ground.
2. Crank engine over, establishing a minimum of 350-450 RPM, and observe tester(s) for spark.
3. Repeat spark test on opposite cylinder if cylinders are being tested individually.
4. For engines with DSAI or Smart-Spark
TM
, turn key switch to ON position and check for 12 volts at center/power
(red) lead terminal of DSAI module or Smart-Spark
TM
box.
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