1983 Mercury 40 HP wont go into full throttle

[joeshere80]

I just bought this motor for my 24 ft pontoon. Starts great, idles great, pumps water great but when out it wont go into full throttle. It acts like the linkage is pulling enough. I adjusted the linkage twice and my only sucess is getting it to idle higher. Do i have a high speed jet plugged? is the prop too big? At idle the motor pushes the pontoon great, alot of troque. Any suggestions would be appreciated. I am tickled that I have a motor that will start and cruise but I would like the option to open it up once and a while.

thanks,
Joe

 

[jeff_smith_0423]

Re: 1983 Mercury 40 HP wont go into full throttle

Not an expert here, but open it up and observe the butterflies in the carbs while operating the throttle lever. Should open all the way up. If it doesn't, you probably have stretched cables, poor adjustments, or a control box problem.

If they open up, I'd rebuild the carbs, do a formal link&sync, change out the fuel filter, and check all of the fuel lines for obstructions and rot.

 

[: Casey1232008]

loss of power

loss of power

my boyfriend has a boat so im trying to help figure it out could some one please call me 502-708-8731. i have a few questionsto ask. our boat wont go over idle speed after it seems to get warm but at first it runs great. please help . thanks jamie.

 

[quickfixer77needxhelp]

Re: 1983 Mercury 40 HP wont go into full throttle

My 1997 runs great for 40 min then on plane the rpms drop why can you guys help