Description; Gnition System - Suzuki FU150SC Manual

6-9 ELECTRICAL SYSTEM
IGNITION SYSTEM
Ignition switch
Ignition coil
Pick-up coil
Sensor input
circuit
Generator
CPU : CENTRAL PROCESSING UNIT
DESCRIPTION
This motorcycle engine is equipped with a new type ignition system. This new system minimizes timing
fluctuations. It has CPU which accurately controls ignition timing depending on the engine r/min.
There is a DC-DC convertor in the CDI unit, which steps up the battery voltage to a higher voltage and
charges the capacitor (C). An SCR connected to the capacitor becomes conductive (turns on) when a
signal is sent to SCR gate from CPU allowing the electric energy stored in the capacitor (C) to discharge
instantly to the ignition primary coil. This then causes a high voltage to be induced in the secondary coil
and a hot spark jumps across the spark plug gap. This ignition timing is controlled by CPU which
processes the pick-up coil pulses to form an SCR gate signal. The signal is then sent to the SCR just when
the crankshaft has reached the best ignition timing for the current engine revolutions.
Correct
Correct
Correct