2. FULL TRANSISTOR IGNITION
Operating Principles
The positive (+) and negative (-) power sources are provided from the exciter
winding. AC current is provided to the Ignition coil from the negative (-) power source.
Current switching to the ignition coil is controlled by the Field Effect Transistor (FET).
The FET turns on when the pulse pole front end reaches the ignition pulse generator
and starts to amplify the current in the ignition coil primary winding. The FET turns off
when the pulse pole back end has passed the ignition pulse generator, which stops
the current in the ignition coil primary winding. The high voltage is then generated in
the ignition coil secondary winding (ignition point).
• Rev Limiter
The engine is equipped with a rev limiter to protect the generating system from
excessive engine speed. The rev limiter receives its signal from the ignition pulse
generator. If the engine speed reaches a predetermined level, the rev limiter will be
activated and will cut off the ignition system.
• Oil Alert® System
The Oil Alert® unit will cut off the ignition system when the engine oil falls to a
predetermined level by turning on the oil level switch and the red light emitting diode
(LED), which acts as a warning light. The red LED will remain lit approximately two
seconds after engine stops using electrical energy from the condenser in the ignition control module.
• Electrical Source
The engine is operated by the dual electrical source: the positive (+) half-wave and the negative (-) half-wave. The
diodes convert AC that is generated at the exciter winding to the positive (+) half-wave and the negative (-) half-wave
AC currents. The positive (+) half-wave becomes the power source for the rev limiter while the negative (-) half-wave
becomes the power source for the ignition system and the Oil Alert® unit. Both of the half waves become the power
source for the FET gate drive. This system realizes a stable rev limiter activating condition and a Field Effect Transistor
(FET) ignition system.
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