1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Repair Manual P/N: 507616, Page 69Get this manual
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TroubIe Check Chart (Cont TROUBLE 3LOSS OF POWER (Providing Ignition(Cont)POSSI BLE CAUSE
4ENGI NE MISFIRES
SPARK PLUGSSee Section inner termi damaged (terminal poiout of Iead)Faul