Electronic Ignition System - Kohler Command Pro CV173 Service Manual

Electrical System
Carbon Fouled
Soft, sooty, black deposits indicate incomplete
combustion caused by a restricted air cleaner, over rich
carburetion, weak ignition, or poor compression.
Overheated
Chalky, white deposits indicate very high combustion
temperatures. This condition is usually accompanied
by excessive gap erosion. Lean carburetor settings,
an intake air leak, or incorrect spark timing are normal
causes for high combustion temperatures.
36

ELECTRONIC IGNITION SYSTEM

Inductive Discharge Ignition System Components
B
A
A Ignition Kill Switch
C Flywheel
E Ignition Module
G Kill Terminal
I Spark Plug Terminal
These engines are equipped with a dependable solid-
state magneto ignition system. In such a system, as
fl ywheel rotates and magnet passes ignition module,
magnetic fi eld induces current in primary coil. As ignition
magnet completes its pass, it induces current in a small
triggering coil, which then turns on a semiconductor
switch. This causes previously induced magnetic fi eld
in primary coil to collapse. As magnetic fi eld collapses,
it causes voltage in secondary coil to rise quickly. This
sharp rise in voltage is suffi cient to arc across gap
at spark plug and ignite fuel mixture in combustion
chamber.
This ignition system is designed to be trouble free for
life of engine. Other than periodically checking/replacing
spark plugs, no maintenance or timing adjustments
are necessary or possible. Mechanical systems do
occasionally fail or break down. Refer to Troubleshooting
to determine root of a reported problem.
Reported ignition problems are most often due to poor
connections. Before beginning test procedure, check
all external wiring. Be certain all ignition-related wires
are connected, including spark plug leads. Be certain all
terminal connections fi t snugly.
KohlerEngines.com
J
F
E
D
C
B
0.254 mm (0.010 in.)
D
F Spark Plug
H Lamination
J Spark Plug Boot
14 690 12 Rev. --
I
H
E
G
Air Gap
Magnet