Kohler COMMAND CH18-745 Service Manual page 123

Section 8
Electrical System and Components
Key Switch or ''Off''
Position of Key Switch
Figure 8-6. Capacitive Discharge Ignition System with Spark Advance.
The timing of the spark is controlled by the location of the flywheel magnet group as referenced to the engine top
dead center and the delay created by the spark advance module.
From
Brown Conditioning
Input
Circuit
Coil
Figure 8-7. Block Diagram - Spark Advance Module.
Operation: The ignition module for this system operates in the same fashion as the fixed timing module,
except the trigger circuit for the semiconductor (L2, Figure 8-5) is replaced by the spark advance module
(Figure 8-7).
8.6
Green
White
Spark
Plug
0.28/0.33 mm
(0.011/0.013 in.)
Air Gap
Flywheel
Delay
Circuit
Comparator
Charge
Pump
Red
Spark Advance Module
Spark Plug
Ignition Module
Magnet
V+ (7.2V)
Power
Source
Pulse
Generator
Reset
Circuit
12 Volt Battery
B+ (12 VDC)
Red
Yellow To
Semi-Conductor
Switch