2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 10Get this manual
IIGeneral information COl unit with microcomputer
The ignition system consists of flywheel, stator, pulser coil, thermoswitch, oil pressure switch, COl unit, and ignition coilThe COl unit contains built-in microcomputer that determines the ignition timing separately for acceleration and for normal operation, based on signals received from the pulser coil, thermoswitch, and oil pressure switch