1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 31Get this manual
DISASSEMBLV OF MAGNETO components removed from the armature plate removing the attaching screwsspark plug high tension leads pulled from the and lamination assemblies
CLEANING, INSPECTION, AND REPAIR
SPARK PLUGS Inspect plugs for cracked porcelain and worn electrodesClean the electrodes with point fileDO NOT sandblast spark plugsAdjust gap to the specified .030 inchIn re-gapping, adjust only the ground electrode, as attempting to bend the center electrode will crack the insulatorSee Figure 4-7motor performance and premature spark plug failure result from improper spark plug installationBefore installing the plug, sure the plug seat in the cylinder head is clean and free from obstructionsSee Figure 4-8Install new spark plug gasket, screw the plug in hand, then tighten to the specified 17-1 to 20-1 foot pounds
Figure 4-7Checking Spark Plug Gap
Figure 4-8Cleaning Spark Plug Seat