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[buddyboy55]

I have a evinrude 65 horse 1972 I believe 5 mach have looked and played with this and still after a year no working engine. It starts up like a new dream motor everytime in the yard you can throttle up and down and she will respond beautifully every time but take it to the water and start it up and go to hit the gas with back pressure and she goes nowhere the engine is all the way and you go putt putt 1-2 miles an hr. back it down and she Idles fine I have replaced the tank and the hose and the clamps I dont think it is sucking any air. Is there a part that has to do with problem we are not aware of that has to do with the throttle insome way it seems to not be getting the gas to go high . any help would be great she will not let me get another boat if I cant fix it I fear I am done on the water and i am not old enough for that to happen . thank you

 

[Daviet]

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You need to start with some basic checks, compression and spark. Those engines will run on one cylinder pretty good on a hose without a load on them.

 

[emoney]

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Ok, I think it's best to start at the very top. Have you done the "Big 3" when it comes to tests? As in, Compression Test/Spark Test/Fuel System check? You say you've spent a year on this?? What have you done/tried so far to date? Any outboard only needs 3 things to run, but it needs all three; Compression, Spark and Fuel. Outside of that, there's no "magic secrets". Post your test results to the above 3, and let's start from the beginning, and you'll get 'er going.

 

[JB]

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http://forums.iboats.com/showthread.php?t=250879

 

[buddyboy55]

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emoney, I am a carpenter for 30 years, I have given the boat to 4 i think 5 friends who have boats and say they are good enough mach to fix it but all have brought it back and either said I cant find the problem or it is something really involved 1 guy said throw it away. but they all said that they did do what your saying but I have always feared they didnt give it their all for what ever reason. the only thing 1 said was on 1 cyl was about 50% the other 2 were good he said . I just found out the model# that they said was not on the engine I just found 2hrs ago and now Im not sure what year it is the number reads 65273S and below it J12488 I believe they guessed what year it was . It is a mess and I dont think to much of my so called friends. I live in MT. 7 months winter thats why I can say a year they have had it cause we can only use it 4 months if were lucky.

 

[1946Zephyr]

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I believe it is an electrical issue, if it acts up on the lake. The humidity is higher and faulty electronics are more likely to act up on the water, than they are at home in the driveway. It would be a good idea to completely go through the electronics and make sure everything is clean and no cracks on anything. You might also start it up in the dark, to see if you find anything arcing out on the block too.

 

[oldrudedude]

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65273S is the model #. The motor is 1972 65hp Evinrude with push button electric shift. http://www.ishopmarine.com/ishop/jsp/AsplIsmHomeSup.jsp?reqFor=42&eCatSupFldr=supplier-100-005-EJ

As the others said: First thing to establish is the 3 basics: compression,spark, and fuel. A little of each may allow the engine to run in the driveway with no load and little backpressure. In the water fuel and spark have to be delivered in the right amount at the right time. Timing and carb linkage have to be synchronized.

If compression is good the problem has to be fuel supply or spark/timing. If you have torn down the carbs, cleaned them, and are certain ALL the Passages are free of blockages, try pumping the fuel bulb a few times when accelerating to ensure fuel pressure. Check for spark on all cylinders with a timing light. Ignition timing is mechanically controlled under the flywheel at the top of the throttle lever on the motor. There is a wire at the top of that lever that must slide freely over the top of the motor as the throttle lever is pushed forward to advance the timing.

 

[buddyboy55]

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bbb

 

[buddyboy55]

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thank you both oldrudude and Captian I am a carpenter by trade Am sure I dont know how to dissmantle the carbs. I will start at night to see if any wires are shorting just frustrated their is no one in this town to trust or has the nohow that would not charge me more than the boat is worth. Will start on it best I can

 

[milliesdad]

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Have you had the prop checked for a spun hub?

 

[fireman57]

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I'm betting on a bad coil or two given the age of the engine if they are original equipment. It will run on one or two cylinders but the symptoms you give point me in that direction. Once you have a load on it then it lays down because there is no spark to burn the fuel. Inspect them for cracks or softness in the potting material. If you have a timing light use it while it is running in a barrel of water.

 

[buddyboy55]

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should I replace the coil do you know how much it would be? being not a mach that seems the easiest to try if it dont cost a lot

 

[fireman57]

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They are round 20 bucks or so. You have to determine which one it is though. You need to check the spark on all your cylinders. The easiest way is to get a timing light and a buddy to go out and when it does this check the spark on each wire. If you find one that is not sparking swap the coil with a known good one and see if the problem follows. If it does then just replace the offending coil.

 

[buddyboy55]

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They are round 20 bucks or so. You have to determine which one it is though. You need to check the spark on all your cylinders. The easiest way is to get a timing light and a buddy to go out and when it does this check the spark on each wire. If you find one that is not sparking swap the coil with a known good one and see if the problem follows. If it does then just replace the offending coil.

I have checked the spark and run at night no shorts I put it back in lake ,man she starts beautiful from trolling speed I gun it all the way she lifts up almost 2 ft for 1 sec and 2nd second she starts her throttle down to almost off but if I throttle back to trolling she runs perfect. I can do that over and over. I had some one steer while we were full throttle and I played with the choke at the engine and she would respond but fight me and start to flood. for a guess I dont think its eletrical I think its gas

 

[soundchaser]

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take all the drain plugs out of the carbs and pump the ball and see if all three carbs bleed an even amount from the drains. There's been a lot of problems with fuel lines getting eaten up by ethenol lately.

 

[buddyboy55]

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I am not experienced enough to find those drains do I have to take the carbs out? I dont know how. could I run this by as a guess. As I did this test last nite trolling speed hit the throttle all the way far as it can go she ripes out of the water for that 1 sec 2nd second she starts down if I pull back again to trolling speed and try instantly again she wont take off but if I wait about 6-7 sec then hit again shell take off again I am guessing does that mean fuel is not making it in to the carbs fast enough for me to hit it instantly again but once it fills up with gas again 6-7 sec she is ready again could that be a fuel pump?

 

[Daviet]

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Look below, #36 is the carb drains that soundchaser is talking about. Behind the plug is the high speed orifice, make sure that it is clean and not restricted.
http://www.ishopmarine.com/ishop/js...CatFilter=BRP&eCatSupFldr=supplier-100-005-EJ

 

[buddyboy55]

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thank you for the picture do the carbs have to come out or off if not , are you saying just back the screw all the way out then put it back in

 

[soundchaser]

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You do not have to remove the carbs, Just the plugs in the front bottom of the bowls. Pump up the ball on your fuel line. You should get good even flow coming out of each drain plug. If you're not. Well then the carbs do have to come apart. probably what's Happening is the hose feeding the bowls are clogged prior to the fuel Valve.

 

[1946Zephyr]

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Have you checked the electronics yet???