1974 Evinrude 25hp wont run.

[Dalejam]

Ok so I figured let me check the fuel pump . So I took the lines off of it . When I did I thought the gas in the line going to the carb looked orangeeeee. So I drained what was in the carb. Then I took a sample from the hose that was going to the fuel pump so this is the gas in the tank. Here are the results. One on left was from the carb bowl I drained it all. One on the right was from the fuel tank. Any tell me why??
Think this might be the idle issue ???
Thanks again
Dale

 

[tphoyt]

That’s looks like very old gas to me or it has been contaminated by something. Get rid of it and start fresh. And take a good look at your fuel line. It may be breaking down internally.

 

[clemsonfor]

Shop Evinrude (BRP) lists UJ4J as the recommended plug. It has an auxiliary gap to increase voltage at the tip and resist fouling. J4C is for the universal magneto.

That plug from what I understand was manufactured for or by OMC of their motors. It's no longer made. You are correct on the construction...the superceded number is just J4J which is the auxillary gap plug. I don't think it's made anymore, an acceptable easily procured plug is j4c.

 

[clemsonfor]

Yes something bis wrong with that gas. How has that has not made it out of the carb yet, have you dumped all the fuel and mixed fresh yet? If it's really bad it might not work but even old gas unless it's really OLD with fire and run. It should have the notable bad gas smell of really old. But yes old fuel will cause idle issues and all kinds of stuff. If it was ethonol fuel it's probably absorbed water and low octane at this point and filled with water. I agree get rid of it, pull the motor plug end and pump the fuel line till clean looking fuel has flushed all the old varnish and fuel out.

 

[Dalejam]

So I took the carb off cleaned it sprayed all
The openings etc…. So no contaminates will be in there . Put new fuel lines in. Went to start it ran then dies. Not what did I do ???? So what happened was I put the gasket on upside down to the bowl. & it blocked one of the passages. It was turning dark, so put everything away. Will be back at it hopefully tomorrow ( Easter Sunday) if my wife does not complain.
I bought new gas and oil so by Monday I hope to have different results . I also bought BR6S spark plugs .
Thank you all for the help
Will let everyone know when I get back to it
Dale

 

[tphoyt]

Take a look at the fuel line on your tank as well. The ethanol gas these days can break down the lines internally and cause all kinds of problems. I hear the newer gray lines are the worst but I had a black one fail on me last year after just a couple of months. It was turning my fuel black and clogging the filter with broken down bits of hose. I switched over to automotive fuel line but with that it will need to be looked after as well but on the exterior as it doesn’t have any UV protection.
It’s just another thing to add to my made to fail book.

 

[Dalejam]

I have not stopped working on the motor. Work and cold weather are not playing nicely @ this point. Hopefully by Friday

 

[oldboat1]

Cam roller sleeve looks worn -- should be replaced. Impossible to set idle without full diameter sleeve. 50:1 mix should yield about 3 oz oil per gal gas. You seem to be a bit short on oil. J4C would be the plug (replaces the obsolete J4J), gapped at .020. Buy a couple of cheap replacement fuel pumps on Amazon to use at least until the motor is ready for primetime. Set idle air mix lean (clockwise) until the engine lean sneezes, then set c.clockwise about 1/8 turn at a time until it runs smoothly.

 

[racerone]

Are we sure the gap on a J4C is 0.020" on this motor ?

 

[oldboat1]

(pls. correct. Thx.)

 

[oldboat1]

Ah -- .020 for points. Usual spark gap for JC4 is .030, but may be different for this ignition.

 

[Dalejam]

0.30 is correct gap for this motor.
So I replaced fuel pump , put new hose in from
Tank to carb. All new. I did not get new gas yet. Will do tomorrow .
One issue I did run into is the fuel pump from Amazon is not pointing in the correct direction. So I unscrewed it to rotate it and put it back together . No I have stalling issues. Watched a video . By me changing the direction of the connection it moves the way the gas can enter. Long story short , I created my own issue again. So rebuilt it the correct way and it runs . Smoking , because I have the old gas still. Will change it out this weekend and I will replace the cam roller too.
Will keep everyone up to date .
Thank you as always.

Ps I picked up a Evinrude 9.9 1979 for cheap. Mice ate most of wires. But that is OUR next project . Yes good compression 140

 

[clemsonfor]

Man your amassing quite the collection of these engines! There pretty bullet proof, replace fix the wear items and they will run practically forever.

 

[Dalejam]

So question about 2 stroke oil, can I use the 2 stroke oil from lowes. Craftsman 2 stroke oil?
Or do I need something else.

Appreciate the help as always
Dale

 

[tphoyt]

TCW3 is my choice.
You could use others but they are formulated more toward air cooled motors.
That’s May 2 cents.

 

[racerone]

On a 5 masted ship it would be an issue if you said ----" pull on that rope "------There are a hundred of them.------That is why they came up with a system of lines.---Same goes for the sails on these things.

 

[Dalejam]

On a 5 masted ship it would be an issue if you said ----" pull on that rope "------There are a hundred of them.------That is why they came up with a system of lines.---Same goes for the sails on these things.

So what would you recommend ???

 

[racerone]

Post #115 ended up in wrong thread----Sorry.-----Use a TCW-III rated oil.------Any of the recognized brands.

 

[clemsonfor]

Any thing tcw3. A lot of the old timers around this board used the Walmart oil and never had any issues with it. I have used a few gallons myself. These days I buy either the Pennzoil that's cheaper at Walmart or last couple years wait till Cabela's puts theirs on sale and I buy their semi synthetic oil. The semi syn and real dino oil are better for longer periods between use. It doesn't dry out as bad as the synthetic oils I have heard and keeps the parts wetter and better oil coated.

 

[Dalejam]

Ok so I will be going to the stores to pick up some Penzoil today. What is the prefers mix ratio 5 gallons of regular or high test , to how much oil please.
Next is gear oil I am changing it in all 3 of my motors what is better I don’t see it but this is what my Walmart sells
Thanks as always
Dale