1965 Evinrude SportFour Heavy Duty 60 HP Outboards Service Manual, 4204, Page 29Get this manual
DESCRIPTION The ignition system on the 60 HP Sportfour consists of distributor type magneto, high tension leads, and spark plugsMAGNETO The magneto uses single coil, two permanent magnets cast into the magneto housing, breaker points, and rotor to develop the high voltag.e necessary for ignitionThe high voltage developed in the magneto coil is distributed to each of the four spark plugs by the rotor through the distributor cap and high tension leadsThe magneto rotor, breaker point cam, and distributor rotor are driven by timing belt which synchronizes the magneto with the crankshaftSee Figure 4-1BREAKER POINTS AND CONDENSER double set of breaker pOints is mounted on the breaker plateThe cam has two lobes 180 apart and the breaker points are located 90 apart on the breaker plate, thus interrupting the current through
BREAKER
CONDENSER
Figure 4-2Breaker Plate
the magneto coil four times in each revolutionThe condep.ser momentarily absorbs the current flowing through the primary of the coil after the pOints open and hastens the collapse of the magnetic field by creating high frequency oscillation in the circuitThe condenser also reduces pitting of the breaker points by absorbing any sparking across themSee Figure 4-2SPARK PLUGS Spark plugs having the proper heat range are very important for peak operation of the motorEvinrude motors are designed to operate with M42K, J4J, or A21X spark plugsSpark plugs are classified according to the temperatures at which they are designed to operate, HOT or COLDSee Figure 4-3Selection of the correct spark plug depends on the type of service to which it is subjectedUnless the