1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 32Get this manual
remove any traces of dirt from contacts, insert strip of bias tape and work it and down between the pointsRepeat 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
low reading the tester indicates weak coil, which must replacedNo attempt should made to improve this spark increasing primary current; the is defective if it cannot made to give good reading the specified primary currentcompletely dead is indicated if there is reading