Kohler Command CH620 Service Manual page 61

A Spark Plug(s)
Flywheel Stator
E
Assembly
I Rectifi er-Regulator
M Starter Solenoid Tang
Alternate Ignition Kill
Q
(–)
U Ignition Kill
Y Black (Ground)
AC Oil Sentry Light
™
AG Accessory
AK Key Switch Ground
AO Battery Negative
CDI/MDI 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.
● 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.
Condition
Both cylinders have good spark but
engine runs poorly or existing plug
condition is questionable.
1 cylinder has good spark and other
cylinder has no or intermittent spark.
Spark on both cylinders but power is
suspect.
24 690 06 Rev. O
B Oil Pressure Switch
F Ignition Module
J Oil Sentry Kill (Green)
™
N Starter Solenoid Stud
R White
V Red
Z Intake Manifold Screw AA
AD Connector
AH Battery
AL Rectifi er
Possible Cause
Spark Plug(s)
Ignition
Sheared Flywheel Key
KohlerEngines.com
C Oil Sentry (Green)
™
G CDI/MDI Ignition
K Violet B+
O Fuse
S Accessory Terminal (+)
W Carburetor
Black
AE Magneto
AI Starter
AM Blue/Red
Install new spark plug(s) and retest
engine performance.
Test ignition modules and
connections.
Check for broken key.
Electrical System
D White Kill
Rectifi er-Regulator
H
Connector
Solenoid Shift Starter
L
Assembly
P Blue
T Yellow
X Carburetor Solenoid
Oil Sentry Panel
AB
™
Light/Remote Light
AF Key Switch
AJ Ground
AN Battery Positive
Conclusion
61