1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 37Get this manual
allowing the motor speed to increaseThe function the cut-out switch is to short out the breaker point the lower cylinder momentarily when case suction increases, preventing the bottom spark plug firing and thus reducing motor speedThe safety switch completes the cut-out switch circuit and prevents it from operating at fuH throttleThe safety switch should adjusted its bracket so that it opens the circuit when the plunger is at the mid-point the slope of the shifter lock stopSee Figure 4-22An ohmmeter test light should indicate closed circuit when the plunger is below the slopeThe safety switch is also part the electrical starting circuitIf the vacuum cut-out switch is not functioning, check
ADAPTER DIAPHRAGM AND PLATE GASKET