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I completely rebuilt a 1983 Evinrude 35 hp motor and runs great.
The only puzzling issue I have is fuel starvation at WOT between 4500-4800 RPM and the engine starts surging.
The surging can be eliminated by squeezing the fuel line bulb.
I have thoroughly went through all other possibilities of the cause, timing etc.
After some research I noticed that there are two types of fuel pumps for this motor, one vacuum and two vacuum connections.
Does anyone know if Evinrude made this change due to fuel starvation issues with this motor?
So, how about the pump you are dealing with on your motor? Does it have “one or two vacuum connections”?