1975 Evinrude 2HP Model 2502 Full Factory Service Manual, Page 27Get this manual
4-3 TO hasten the collapse, condenser in the primary circUit absorbs the current which would otherwise arc aCroSS the opening breaker pointsThe rapid collapse induces current of sufficient voltage in the secondary circuit to arc across the spark plug air gapThe condenser, which acts like storage tank, consists of thin sheets of metal foil separated by insulation, rolled to save space and enclosed in metal caseOne sheet of foil is groWlded to the case, the other is connected through an insulated wire to the insulated stationary breaker pointINSULAT ION
SPARK PLUGS
Spark plugs having the proper heat range are very important for peak operation of the motorSpark plugs are classified according to the temperatures at which they are designed to operate, HOT or COLD See Figure 4-2
Figure -1 ECondenser Exploded