Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 29Get this manual
IGNITION SYSTEM
plugs will fire early; if adjusted with excessive gap, the plugs will fire too late, for efficient operationTherefore, correct point adjustment and synchronization are essential for proper engine operationAn engine may be in apparent excellent mechanical condition, but perform poorly, unless the points and synchronization have been adjusted precisely, according to the Specifications in the AppendixTo synchronize the engine, see Chapter 5Worn ignition points are common contributing to poor engine performanceproblem area