1977 Evinrude 175-200 HP Service Repair Manual P/N 5311, Page 18Get this manual
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TROUBLE TROUBLE (CONT)
4ENGINE MISFIRES (PrO'viding Fuel System and CarburetO'r )
SPARK PLUGSSee SectiO'n CO'ver O'r inner terminal damaged (terminal pO'int O'ut O'f lead) Faulty le