1969 Evinrude 40 HP Big Twin, Big Twin Electric Lark Service Manual 4596, Page 35Get this manual
DISASSEMBLY OF MAGNETO All components may be removed from the armature plate by removing the attaching screwsThe spark plug high tension leads can be pulled from the coi and lamination assemblies
bDirt, foreign particles, and oi are very detrimental to contact performanceThe oils and acids from person's hand, even though clean, can affect contact resistanceOil deposits on the points will cause them to burn out after very short period of operationIf points need cleaning, use alcohol or trichlorethyleneNEVER FILE POINTS - replace the mcT remove any traces of dirt from contacts, insert strip of bias tape and work it up and down between the points Repeat entire cleaning procedure for second set of points dCheck points for good electrical contact, using ignition analyzer as described under "Breaker Point Testing Check and adjust breaker point setting as necessary as described under "Breaker Point Adjustment
CLEANING, INSPECTION, AND REPAIR