32
1985 to Present
SOLID STATE IGNITION. Tecumsehs solid state
capacitor discharge ignition (CDI) is an all electronic
ignition system and is encapsulated in epoxy for
protection against dirt and moisture.
SOLID STATE IGNITION OPERATION. As the magnets
in the flywheel rotate past the charge coil, electrical
energy is produced in the module. This energy is
transferred to a capacitor where it is stored until it is
needed to fire the spark plug.
The magnet continues rotating past a trigger coil where
a low voltage signal is produced and closes an electronic
switch (SCR).
The energy which was stored in the capacitor is now
transferred through the switch (SCR) to a transformer
where the voltage is increased from 200 volts to 25,000
volts. This voltage is transferred by means of the high
tension lead to the spark plug, where it arcs across
the electrode of the spark plug and ignites the fuel-
air mixture.
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