Evinrude 1973 85 HP model 85393m

by Bill Carter
(Cordova, Tennessee)

I have replaced the stator, timer base, power pack,all 4 coils, all spark plugs.

I rebuilt the carbs and replaced all 4 reed valves.
IT has an occasional (at about 45 second intervals) cough where it spits out the exhaust.
I haven't timed it yet but I don't suspect the timing.
I believe that the carbs are in time.
The compression is at 115 psi + or - 10 psi.
I have fresh fuel with some octane booster added.
I just bought this motor a few months back and I want it to be reliable.
Any help will be greatly appreciated.

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