1975 Evinrude 50hp Dies when brought from WOT

[Jacob645]

At first this motor wouldn't get any speed, none! Now we've finally gotten it to go fast at WOT. The problem is when you bring it down from WOT is dies. Sometimes it will just drop one cylinder, but most of the time it just grinds to a halt and is extremely hard to start. We've put two new coils on it, compression is good, gets good spark, and decarbed it. We've played with the needle valve adjustments too and nothing seems to help. The timing is advancing all the way to the stop. The fuel lines and bulb are all new. Please help! Thanks!

 

[tashasdaddy]

Re: 1975 Evinrude 50hp Dies when brought from WOT

sound like you need to do a proper link and sinc. possiblly one of the carbs or linkage is sticking, and flooding the one cylinder, when slowing. sounds more fuel related.

 

[Jacob645]

Re: 1975 Evinrude 50hp Dies when brought from WOT

Ok this may sound dumb but on the controls, under the key there is the idle adjustment screw right? Right now it is screwed all the way in. Clockwise. What does it actually control and how?

 

[eli_lilly]

Re: 1975 Evinrude 50hp Dies when brought from WOT

Ok this may sound dumb but on the controls, under the key there is the idle adjustment screw right? Right now it is screwed all the way in. Clockwise. What does it actually control and how?

Way off there. That knob controls the throttle lever tension. It gets adjusted as necessary to keep the throttle lever from moving by itself.

-E

 

[Jacob645]

Re: 1975 Evinrude 50hp Dies when brought from WOT

Hah! Embarrassing! Anyways, I sync and linked it by the manual after installing the coils, so it should be good there. Also had a marine mechanic check it out while trying to work on it not going fast. It sounds to me like it is fouling the plugs because after we took them out and dried them, it would start up fine, but when you bring it down it can't burn the fuel up fast enough or something. Thanks for helping! Any advice is welcome and appreciated!