1979 Evinrude 4 HP Outboards Service Manual, PN 5424, Page 30Get this manual
DESCRIPTION The magneto Capacitor Discharge (CD Ignition System consists of five major componentsThey are: 1Flywheel AssemblyContains two magnets, cast into the flywheel 180 degrees apartThese magnets are magnetically' charged of opposite polaritySee Figure 4-12Charge Coil Assemblylarge coil of wire which generates Alternating Current (A.C that is sent into the Power PackSee Figure 4-1 3Sensor Assemblysmall coil of wire which generates the triggering voltage for the Power PackSee Figure 4-1
aCapacitor Charge Circuit bTriggering Circuit cCapacitor Discharge (CD Circuit 5Ignition CoilsGenerate the very high voltage required to ignite the fuel in each cylinder
THEORY OF OPERATION
Simplified basic circuit illustrations support the theory of operation are intended for instructional use onlyThe theory of operation and schematics for the Magneto Capacitor Discharge Ignition System use the following three basic electronic components: DIODEcomponent in which current can flow only in one direction (as indicated by the arrow)