2005 SO Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 94Get this manual
IGNITION SYSTEM OPERATION
OPERATION
The ignition system is condenser discharge typeThe condenser built in the COl unit stores the electrical energy generated by the condenser charge coilThe electrical energy stored in the condenser is released to the ignition coil primary windings by the ignition timing signal calculated by the COl unit from the pulser coil signalIgnition timing varies based upon engine speed Timing is fixed at 10 ATDC until the engine startsTiming then varies from ATDC to 30 BTDC based on engine speedEngine stop switch