1977 Evinrude 4HP Outboards Service Manual, PN 5303, Page 29Get this manual
primary winding wire, and then flows through S.C.R#1 to the other side of the capacitorDuring capacitor discharge, current flows through the ignition coil primary winding and S.C.R#1 until the capacitor is discharged and S.C.R#1 turns itself offThe capacitor can now be recharged as described in the capacitor charge circuitCurrent flowing through the No1 ignition coil primary winding produces large magnetic field surrounding the secondary winding and produces the high voltage to the spark plug, igniting the fuel in the engine cylinderWhen SCR#2 is triggered, the capacitor is discharged through the No2 ignition coil primary windingCurrent flows through SCR#2 and returns to the other side of the capacitorThe No2 ignition coil then produces the high voltage to the spark plug to ignite the fuel in the other cylinder dJumper Wires (4 required)be made as shown Figure 4-5
Jumper leads can
No16 wire, inches (203.2 mm) long Pin OMC Part No511469 Socket OMC Part No581656 Tubing OMC Part No510628 one inch (25.4 mm) long