1976 70hp Evinrude bog down

[blackbelt]

I have a 1976 70 hp evinrude. It ran fine for 20 minutes then sputtered and vibrated badly. I was only able to run at low rpm, about 2000. The problem has come and gone, but now seems to be getting worst. Electrical or carbs?

 

[JB]

Re: 1976 70hp Evinrude bog down

Howdy Blackbelt.<br /><br />Carb/fuel pump problems rarely come and go, but you can confirm that it is not a fuel pump problem by pumping your primer bulb when the engine is acting up. It it is the fuel pump your engine will pick right up for a few seconds.<br /><br />If you have water in your tank that can cause your problem. If you don't have a water seperator/filter in line between tank and engine, get one.<br /><br />Your most likely culprit is the powerpack, but don't do anything about it until you have nade sure that it isn't something in the fuel system.<br /><br />Good luck.

 

[blackbelt]

Re: 1976 70hp Evinrude bog down

Thanks for the info. Prior to my last attempted outing I discarded the old gas, cleaned the tank and filled with fresh gas. My problem continued. The power pack was replaced on this engine about three years ago, but i guess it could be bad again. I will get a water seperator also as I do not have one now. Again thanks, and any additional thoughts are appreciated.