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M18 & M20
SECTION 8
ELECTRICAL SYSTEM AND COMPONENTS
MAGNUM ELECTRONIC
MAGNETO IGNITION SYSTEM
This engine is equipped with a state-of-the-art elec-
tronic magneto ignition system. The system consists
of the following components (refer to Figure 8-1):
* A magnet assembly, which is PERMANENTLY af-
fixed to the flywheel.
* An electronic magneto ignition module, which is
mounted to the #1 side cylinder barrel.
© Akill switch (or key switch) which stops the en-
gine by grounding the ignition module.
Operation
As the flywheel rotates and the magnet assembly
moves past the ignition module, a low voltage is in-
duced in the primary windings of the module. When
the primary voltage is precisely at its peak, the mod-
This high voltage creates a spark at the tip of the
spark plugs, igniting the fuel-air mixture in the cam-
bustion chambers. The timing of the spark Is automat-
ically controlled by the module.
Therefore, no ignition
timing adjustments are necessary or possible with this
System.
NOTE:
Do not connect 12 volts to the ignition system
or to any wire connected to the ignition
module.
The ignition system operates independently of
the battery, starting, charging, and other auxil-
iary electrical systems. Connecting 12 volts
to the ignition module can cause the module
to bum out. This type of damage is not cov-
ered by the engine warranty.
A break-before-make type key switch is re-
quired to prevent damage to the ignition
ule induces a high voltage in its secondary windings.
module.
Optional
Diode
Ignition
Module
.008/.012"
IL
Spark
i i Е
Air Gap
Plugs
ЕА
ір
а
(Fe
+7
High Tension
High Tension
Lead (D)
4
Ma
Lead (C)
s
f
c
QU E
:
ONU
EC
KIII Switch
`
н
Ог
Kill Terminal (B) ~~.
OFF Position
|
-
Of Keyswitch
Laminations (A)
о.
Сой
^
Assembly
Ignition Module
Figure 8-1. Magnum Electronic Magneto Ignition System.
8.1
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