2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 210Get this manual
1H-1 Ignition System:
Ignition System
Power Head
General Description
Ignition System Description
The ignition system used by the DF708090 is fully transistorized, electronic microcomputer timing advanced typeThis system is battery powered, with the ECM controlling all of the ignition timing functionsThe ignition system is composed of the ignition coil, spark plug and components for system control (ECM, sensor, switch etcWhen the ignition switch is "ON", battery voltage (12 V) is applied to the circuit as shown in the illustrationThe ECM determines the optimum ignition timing and duration of current flowing through the ignition coil primary winding based on the signals received from various sensorsThe ECM interrupts the base current of the power transistor inside the ignition coil thereby controlling current flow (ignition) to the primary winding of the ignition coilIn this way, mutual induction high voltage occurs in the ignition coil secondary side and spark is generated.Z9J0111801001