Honda BF115A, BF130A Outboard Motors Shop Manual., Page 384Get this manual
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Ignition timing control system
The full transistorized ignition that is excellent in ignition performance and combustion stability is adopted on this outboard motor as the basic ignition system, and the igniter unit of the system is incorporated in the ECMThe ignition timing control system controls the ignition timing by first determining the basic ignition timing based on the engine speed signal sent from the pulser coil and the intake manifold vacuum signal sent from the MAP sensorThen, the ignition timing control system compensates the basic timing with the TP sensor, ECT sensor and the IAT sensor for optimum ignition timing
PULSER COIL SENSOR ELECTRICALLY TIME
IGNITFR
IGNITERCOIL
SPARK PLUG