1975 Johnson 4HP 4R75, 4W75 Outboards Service Manual, Page 33Get this manual
REASSEMBLY OF MAGNETO TO MOTOR aIf flywheel key has been removed, reassemble to crankshaft with outer edge parallel to taperSee Figure 4-16
Be sure that the single upset mark on the side of the key is facing downSee Figure 4-16Incorrect installation of the key will affect cam position and ignition timingTAPERED DOWN
Figure 4-15Coil Locating Ring Alignment of the magneto coils will be simplified with the use of coil locating ring (Special Tool #317001) machined to fit over the four bossesSee Figure 4-15c Reconnect all leads on the armature plate, making sure that connections are clean and tightdMake sure that new oiler wick is installed under the forward coilSee Figure 4-6
Figure 4-17Armature Plate bInstall cam, making certain that side marked "TOP" is upSee Figure 4-17cAPply coat of OMC Sea-Lube Anti-Corrosion Lube to the armature plate support ring, retaining ring, and bushing in armature plateInstall retaining ring with tapered side down, and support ringAlign retaining ring to correspond to the position of the armature plateSee Figure 4-1700 NOT add oil or grease to the oiler wick on the magneto