1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 39Get this manual
sure that the single upset mark the side of the key is facing downSee Figure 4-18Incorrect installation of the key will affect position and will result in late (retarded) ignition timing Figure 4-19Magneto Support Position
Figure 4-17Flywheel
Position
DO NOT permit solvent used to clean tapers to wash out of wickgReplace flywheelCheck for spark each cylinder connecting the spark plug high tension leads to spark checker (Stevens Experimental Part #S-21 S-13), and cranking the motor with starter Replace starter ratchet and flywheel nutTighten flywheel nut to torque specified in Section 2