Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 150Get this manual
2) Inspection of Plug Cap Remove the part and test it as separate unitBO D
Disconnect plug cap from spark plugRemove plug cap from high tension cableMeasure plug cap resistanceReplace if other than specified valuePlug Cap Resistance (at 20C)3.07.0 k