1980 Johnson 2HP Service Manual, Page 29Get this manual
Figure 4-5Wire Armature Plate Screw
Figure 4-6Armature Plate Removed
Figure 4-7Liner Boss and Groove
CLEANING,
AND REPAIR
Inspect plug for cracked porcelain and worn electrodesClean or replace spark plugAdjust gap to the specified .030 inch (0.8 mm)In re-gapping, adjust only the ground electrode, as attempting to bend the center electrode will crack the insulatorSee Figure 4-8Poor motor premature spark plug failure from improper spark plug installationBefore result Figure 4-8Checking Spark Plug Gap
the plug, sure the plug seat in the cylinder head is free from obstructionsSee Figure 4-9Instal1 new spark plug gasket, screw the plug in hand, then tighten to the specified 17-12 to 20-12 foot pounds (24 to 27 Nm)