Re: Evinrude 1986 225 Carb flat spot/stalling
Just got back in from water testing it. What I did besides resetting the butterflies was to insert 26 gauge craft wire into eash #20 Jet, wrapped it around the jet, then had the end hang over the edge of the carb so the foam gasket of the intake cover would hold it in place. Basically I used a modified concept of placing "toothpicks" in the jets to richen them up. However I didnt want to completely close off the jet, just restrict it a bit. I estimate the wire closed the jet off more than 75%. Well, finally... after 3 months of trying, i finally have a motor that runs right. She is smootheeee... perfect, maybe a bit rich and lethargic but I anticipated that due to the size of the wire. Finally, a motor i didnt recognize... one that throttled up and down without going flat. Even the idol smoothed out. Heaven. BUT... yes, its temporary and YES... shes running rich. Just for sanity sake, I wanted to check and see the impact of re-syncing the carbs. So i dropped the anchor, took the airbox cover off, removed the wires from the jets, put it all back together and ran it... to return to the same nightmare I started with. Nervous through the first 1/4 throttle then the flat spot, dying at the flat spot, choke, then throttle up for smoothness in the upper.
So at least ive confirmed that richer jets will solve what is going on. Keep in mind I do not know what is causing it to lean JUST in the idle circut, but after I rejet it i dont really think I will care much. OF course the jets didnt come in friday and they are closed monday so im looking at maybe tuesday. I am concerned at how well it ran with such a drastic reduction in flow (remember I think the wire blocked about 75% of the jet opening). Im not sure a drop to #16 will do it. I will try it first. There are always #14's and if thats no good I will resort to soldering the jets closed and drilling them with a micro drill bit. But im thinking 3 steps ahead as usual (keeps me optimistic). Basically I have confirmed that smaller jets(richening the idle circuit) will get the motor to work right. WHY its leaning is another story. After jetting I dont think I will really care why, but, I am always open to all your suggestions and will be willing to try anything else that makes sense.