1969 Evinrude 40 HP Big Twin, Big Twin Electric Lark Service Manual 4596, Page 41Get this manual
switch vacuum hose connector will indicate switch operationSee Figure 4-24If switch operation is faulty or erratic, disassemble the cut-out switch and inspect the diaphragm and contactsReplace parts as required and reassembleSee Figure 4-25 Figure 4-24Testing Cut-Out Switch doses the cut-out switch circuit and prevents it from operating at full throttleThe safety switch is also part of the electrical starting circuitThe safety switch should be adjusted on its bracket so that it opens the circuit when the plunger is at the mid-point on the slope of the shifter lock stopSee Figure 4-23An ohmmeter or test light should indicate closed circuit when the plunger is below the cam slopeIf the vacuum cut-out switch is not functioning, check