1982 75 HP Evinrude Problems

V

VMIJOE95

Recruit
Joined
Aug 20, 2007
Messages
4
I have a 1982 75 HP. When I put it on the water hose to check things, it runs fine. When I actually get it on the water it bogs down. I can get it up to speed and am running about 4200-4500 RPMs, but after about 30 seconds, it bogs down to around 2000 RPMs. I have put different carburators on it and rebuilt them also. Any ideas as to what I need to do to get it to keep from bogging down? Thanks for any help you have to offer.
 
Bifflefan

Bifflefan

Commander
Joined
May 27, 2009
Messages
2,933
Re: 1982 75 HP Evinrude Problems

Sounds like your running out of fuel.
Is the tank vented?
Fuel lines good?
Filter plugged?
Primer ball?
If you can id try running a new piece of line from a can to the pump and see if that makes a difference. Take a friend along to hold the can. That will tell you oif its a line, filter or pick-up problem. Next it would suspect the pump. try pumping the primer ball when it does it to see if that helps.
If none of that helps then one of the way more knowledgeable 2 stroke guys will have the right answer.
 
R

R.Johnson

Rear Admiral
Joined
Sep 24, 2003
Messages
4,446
Re: 1982 75 HP Evinrude Problems

How long has that engine been used at 4500 RPM? Why the carb replacement?
 
V

VMIJOE95

Recruit
Joined
Aug 20, 2007
Messages
4
Re: 1982 75 HP Evinrude Problems

We replaced all of the fuel lines and bought a new gas tank. It's venting well. This boat sat for 9 years untouched. My Dad gave it to me when I visited him in Florida. I was roughly guessing the 4500 RPMs. It may be closer to 4000. Not real sure right off hand. Any other ideas? Thanks for your help.
 
K

krogie

Petty Officer 2nd Class
Joined
Jun 3, 2009
Messages
107
Re: 1982 75 HP Evinrude Problems

if there is a way to choke the motor as it starts to bog , either manually or a t the control box then that will tell you if you are having a fuel starvation problem. as the motor starts to bog pop the choke , if it idles out fine for a second or two then you are that muck closer to your problem. if not then you may be looking at a electrical component overheating.
 
You must log in or register to reply here.
Top