1971 Evinrude StarFlite 100 HP Outboards Service Manual, PN 4753, Page 33Get this manual
DESCRIPTION
The breaker point capacitor discharge (C.D ignition system consists of three major electronic componentsThese are the ignition coil, two sets of breaker points, and an amplifier assemblyThe amplifier assembly is completely sealed and is attached to an electrical component bracket at the rear of the powerheadA terminal block, mounted on the electrical component bracket, is used for most powerhead electrical connectionsSee Figure 4-1DO NOT ATTEMPT TO OPEN THE AMPLIFIER ASSEMBLY AS THIS WILL VOID THE WARRANTYTo compliment the C.Dignition system, special surface gap spark plugs are usedThese are Champion L-77V (OMC Part Number 384751)
THEORY OF OPERATION
The transistorized converter in the amplifier changes the 12 volt battery supply to 300 volts and stores it in the energy storage capacitorFLYWHEEL NUT FLYWHEEL
The breaker point circuit, opened by the distribution cam triggers the amplifierThis discharges the 300 volt energy from the amplifier storage capacitor into the coil where it is boosted to the 25000 volts available at the spark plugsWhen the storage capacitor has discharged its energy at the spark plug gap, the electronic switch opens and the converter recharges the storage capacitorTROUBLESHOOTING THE C.DIGNITION