Loss of Power with full throttle on 1987 80hp outboard Mecury

Drano103

Recruit
Joined
Jul 2, 2009
Messages
3
I am having trouble giving my engine full throttle. When I am at about 3/4 throttle the engine runs fine. If I go up a little bit it will run pretty well bogging down for a second at inconsistant times. When I put the throttle all the way forward it bogs down and stays that way unless I back off of it. This has gotten worse since i've owned the boat.

I also recently started having trouble off the start. Say I want to pull a skier and give it full throttle from and idle, it kills the engine. It didn't use to do this.

It would be much appreciated to anyone who can help with the troubles that I'm having. Thank you.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,858
Re: Loss of Power with full throttle on 1987 80hp outboard Mecury

It is likely a fuel pump, fuel filter or antisiphon valve issue. Clean the filters, remove and clean the A-S valve (it is usually located in the fuel pickup fitting on the fuel tank)
If that doesn't get it. rebuild the fuel pump.
 
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