1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 34Get this manual
Remove and replace the oiler wick which is mounted under one of the coil laminationsTo change the high tension leads, remove the coil and then remove the screws holding clamps and throttle control cam on the bottom side of the armature plate and remove the high tension leadsSee Figure 4-9B 0.030 (0.76
Figure 4-10Checking Spark Plug Gap
Poor motor performance and premature spark plug failure may result from improper spark plug installationBefore installing the plug, be sure the plug seat in the cylinder head is clean and free from obstructionsSee Figure 4-11Screw the plug in by handthen tighten to the specified 17-12 to 20-1foot pounds (24-27 N.m) If threads are stripped in cylinder head, HeliCoilinserts are availableSee Section 2Caution should be taken when installing HeliCoil insertsTools and inserts are available from your parts distributor
1Screws 2Clamps 3Throttle control cam