1968 Evinrude Speedifour, Starflite 85HP Service Repair Manual P/N 4486, Page 12Get this manual
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TROUBLE TROUBLE 2LOSS OF POWER(Assuming Ignition )
POWER HEADSee Section Lower bearing l1ead loose (check end play) Carburetor and distributor not synchronized Throttle control lever bent (WOI1'