1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Repair Manual P/N 507661, Page 260Get this manual
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8 [U 2_8 [lJ 7=2=2 7 2 Starter System Voltage Drop Test
ill twist and remove all spark plug leadsClean and retighten, replace, connection, component having greater than specified voltage drop