1992 Johnson Evinrude "EN" 40 thru 55 Service Repair Manual, P/N 508143, Page 56Get this manual
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Heli-Coillnserts and Installers
mm spark plug inserts are specially made for use in aluminum cylinder headsDo not use substitutes
Name of Part Heli-Coillnstaller Kit, 8-32 Heli-Coillnstall