1975 Johnson 4HP 4R75, 4W75 Outboards Service Repair Manual P/N JM-7503, Page 30Get this manual

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CLEANING, INSPECTION, AND REPAIR SPARK PLUGS Inspect plugs for cracked porcelain and worn electrodesClean the electrodes with point fileAdjust gap to the specified .030 inchIn re-gapping, adjust only

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