1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 40Get this manual
BREAKER POINT ADJUSTMENT For breaker point adjustment, magneto must assembled to motor and flywheel must removedDisconnect leads from breaker point assembliesConnect meter or test light between breaker plate and forward breaker point screw terminalSee Figure 4-20Place timing fixture (Special Tool #378966) crankshaftRotate the crankshaft so that the side of the fixture marked (top) is aligned with the first projection the armature plateSee Figure 4-21Figure 4-22Adjusting Breaker Points Rotate the crankshaft in onlyclockwise direction hRotate crankshaft through 1800 clockwise, and repeat entire procedure for second set of pointsiReattach leads to breaker assemblies, and replace flywheelCheck spark at each cylinderTighten flywheel nut to torque specified in Section 2Connect lead wires to spark plugsmaking sure that contact is made at the spark plug terminals
VACUUM CUT-OUT AND SAFETV SWITCHES '"
If the throttle is closed while the motor is
in neutral, crankcase suction abnor highThis high suction (vacuum) will cause- erratic functioning of the carburetorallowing the motor speed to increaseThe function of the cut-out switch is to short out the breaker point for the lower cylinder momentarily when crankcase suction increases, preventing the bottom spark plug from firing and thus reducing motor speedThe safety switch