1983 Yamaha 30EN Outboards Service Manual, Page 120Get this manual
ELECTRICAL SYSTEM DESCRIPTION
This model employs the capacitor discharge ign ition (CD I) system in which single ignition coil is used to produce sparks simultaneously in both upper and lower cylinders, but ignition takes place only in one cylinder which is on the compression strokeThe lighting coil delivers an output of 80W using 4-pole magneto