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bb74 Evinrude 85hp only 2 cylinders firing

walloon8

New member
I have a '74 85hp evinrude

I have a '74 85hp evinrude that only fires the port cylinders. Looking for troubleshooting steps. I have not replaced the powerpack. All I know is that only the 2 port cylinders fire. Thanks for any direction to start repairs.
 
"Reverse/switch the sensor wir

"Reverse/switch the sensor wires that lead from the timer base to the powerpack (black black/white, white white/black).

If the problem stays the same, replace the powerpack.

If the problem follows the wire switch, replace the timer base.

Keep in mind however that the problem could also simply be a loose, or tight but dirty sensor wire, or a broker sensor wire from the timer base to the powerpack."
 
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