1980 Mercury Outboard stalling at high RPMs

[SigiloEspado]

So, I've had this boat for a couple years now and have gone through several different fixes. I've replaced the plugs and cables, I've done a carb rebuild and I've replaced the fuel pump. I've also replaced the line from the tank. The issue I'm having is when I try to bring the engine up to high RPMs, it bogs down and stalls. The serial number on the motor is 5634325. I've been told that it could possibly be the "power pack"? Any insight or help would be greatly appreciated.

 

[SigiloEspado]

Re: 1980 Mercury Outboard stalling at high RPMs

Also, it is a 50hp engine.

 

[Chris1956]

Re: 1980 Mercury Outboard stalling at high RPMs

Pump the fuel line primer bulb as you accelerate. If that fixes it, you have some kind of fuel line restriction.

 

[SigiloEspado]

Re: 1980 Mercury Outboard stalling at high RPMs

I have also tried that, but when I replaced the fuel line and pump that went away.

 

[Chris1956]

Re: 1980 Mercury Outboard stalling at high RPMs

Does it bog when you first try to accelerate from idle, or once you get on plane?

 

[SigiloEspado]

Re: 1980 Mercury Outboard stalling at high RPMs

Pretty much as soon as I try to accelerate.

 

[Chris1956]

Re: 1980 Mercury Outboard stalling at high RPMs

OK, it is likely your carbs idle mixture is set too lean. Open the top carb 1/8 turn (CCW), and see if acceleration improves. If not, open bottom carb 1/8 turn and try to accelerate. Repeat sequence as necessary testing acceleration after each adjustment.