Kohler XT775 [29/56] Electrical system
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Kohler XT775 [29/56] Electrical system

Kohler XT775 [29/56] Electrical system
29
Electrical System
14 690 01 Rev. G KohlerEngines.com
CDI Module Operation (aluminum ywheel)
Ignition System Components
A
B
C
D
G
H
I
E
F
J
A
Kill Switch/
Off Position of
Key Switch
B Flywheel
C Magnet D Ignition Module
E Lamination F Kill Terminal
G Spark Plug H Spark Plug Boot
I Spark Plug Terminal J
Air Gap
0.254 mm (0.010 in.)
As ywheel rotates and magnet passes CDI ignition
module, magnetic eld induces current in charging coil.
Current pulse is rectied by a diode and this signal
charges a high-voltage capacitor. As magnet completes
its pass, a change in polarity of signal produced by
ywheel magnet turns on semiconductor switch, and
directly connects charged capacitor to primary coil of
transformer. As capacitor discharges energy, low voltage
at primary winding is transformed to high voltage in
secondary winding of module. A high voltage pulse
is then delivered to spark plug, where it arcs across
electrode gap and ignites fuel in combustion chamber.
This system consists of following components:
● Magnets, permanently afxed to ywheel.
● Spark plug with rubber boot.
● Electronic, capacitive discharge ignition module
mounted on engine crankcase.
● Kill switch (or key switch); grounds module to stop
engine.
ELECTRONIC IGNITION SYSTEM
These engines are equipped with dependable solid-state magneto ignition systems. Two types of ignition modules are
used on these engines, capacitive discharge ignition (CDI), and inductive discharge ignition (IDI).
Both ignition systems are 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 t snugly. Make sure ignition switch is in run position.
IDI Module Operation (cast iron ywheel)
Ignition System Components
A
B
C
D
G
H
I
E
F
J
A
Kill Switch/
Off Position of
Key Switch
B Flywheel
C Magnet D Ignition Module
E Lamination F Kill Terminal
G Spark Plug H Spark Plug Boot
I Spark Plug Terminal J
Air Gap
0.254 mm (0.010 in.)
As ywheel rotates and magnet passes IDI ignition
module, magnetic 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 eld in primary coil to collapse. As magnetic
eld collapses, it causes voltage in secondary coil to
rise quickly. This sharp rise in voltage is sufcient to
arc across spark plug’s gap, and ignite fuel mixture in
combustion chamber. This system consists of following
components:
● Magnets, permanently afxed to ywheel.
● Spark plug with metal boot.
● Electronic, inductive discharge ignition module
mounted on engine crankcase.
● Kill switch (or key switch); grounds module to stop
engine.

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