8.3
Section 8
Electrical System and Components
8
Figure 8-2. Electronic Magneto Ignition System, CV11-15, CV460-465, CV490-495 Engines.
Electronic Magneto Ignition System, CV11-15, CV460-465, CV490-495 Engines
Operation
As the fl ywheel rotates and the magnet assembly
moves past the ignition module, a low voltage is
induced in the primary windings of the module. When
the primary voltage is precisely at its peak, the primary
circuit is interrupted, inducing a high voltage in the
secondary windings. This high voltage creates a spark
at the tip of the spark plug, which ignites the fuel-air
mixture in the combustion chamber.
The timing of the spark is automatically controlled
by the module. Therefore, other than periodically
checking/replacing the spark plug, no maintenance,
timing, or adjustments are necessary or possible with
this system.
CV11-15, CV460-465, CV490-495 engines are
equipped with a dependable electronic magneto
ignition system. The system consists of the following
components:
• A magnet assembly which is permanently affi xed
to the fl ywheel.
• An electronic magneto ignition module which
mounts on the engine crankcase.
• A kill switch (or key switch) which grounds the
module to stop the engine.
• A spark plug.
Kill Switch or Off
Position of Key Switch
Air Gap
0.2-0.3 mm
(0.008-0.012 in.)
Flywheel
Magnet
Ignition Module
Spark Plug
Lamination (A)
Kill Terminal (B)
Spark Plug
Terminal (C)
Spark Plug Boot
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