1970 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Service Manual 4687, Page 31Get this manual
cTo remove any traces of dirt from contacts, insert strip of bias tape and work it up and down between the pointsRepeat entire cleaning procedure for second set of pointsdCheck 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
A low reading on the tester indicates weak coil, which must be replacedNo attempt should be made to improve this spark by increasing primary current; the coil is defective if it cannot be made to give good reading on the specified primary currentA completely dead coil is indicated if there is no reading