1956 Evinrude 10HP

[Trailbum]

Hi Guys,<br /> I bought a beautifully restored 1956 Evinrude 10HP last Fall. Ran perfectly in the test tank when I bought it. Now, 6 months later I'm ready to use it!!! I put it in a test tank and it runs well most of the time, but has an occasional "hiccup" or "cough". Not sure if this is just an engine misfire but adjusting the high and low speed doesn't correct it, just makes it worse. It sometimes stalls and is terribly hard to restart. Usually have to pull the plugs and dry them to get it started again. Has new points and coils, rebuilt carb, pressure tank, etc. I'm thinking since it has been sitting about 6 months, is it time to remove and thoroughly clean the carb... again??? Thanks in advance for your advice.

 

[alcan]

Re: 1956 Evinrude 10HP

Hi Trailbum<br />Those older motors with the presure fuel system like to sneeze a bit on warm-up. I belive it is do to a lean condition caused by the presurizing of the tank. That is the tank dose not have enough presure in it to supply enough fuel, yet. I find this is espiecaly true when the tank is less than full. Now that you turned your knobs, you will probably need to reset them. Slow speed setting is 1.5 turns out from litely seated. High speed setting is 3\4 turn out from litely seated. Adjust high speed frist at WOT. Then the slow speed with the throtle closed.You my have some gunk in the carb so it wouldn't hurt to check. Also don't run 6mo. old fuel. That sneezing means too lean, so if your trolling along and it starts in doing this more than once in a while turn the slow speed to rich, just a notch. Good luck have fun.

 

[Tracy Coleman]

Re: 1956 Evinrude 10HP

Trailbum<br />The low speed needle valve (top), and the high speed needle valve (bottom) are adjusted at idle and high speed, separately. A tank is ok for the idle adjustment except if the engine is breathing it's own exhaust fumes. You describe a kind of sneeze at low speed which usually indicates a lean condition. Very slowly open (counter clockwise)the low speed needle until it stops sneezing, turn in 'til it does it again, then backup 'til it stops sneezing and runs smoothly. Wait until you get on the water before fine tuning the high speed needle. If you didn't unplug the fuel line and run the engine dry the last use, you may have crapped the carb again and need a quick clean.<br />Assume you have new plugs, Champion J6C at .030 are good. Evinrude Ram oil at 24/1 or 32/1 will work great. Use 2+4 Fuel Conditioner at storage rate all the time to keep fuel fresh. Nothing improves old fuel without stabilizer. Crack the gas cap open when running to make sure it is holding decent pressure then close it, just a test for the tank pressure. It's good to let the pressure off when you are done, they will build a lot of pressure in the sun. My fishing pal is a '63 18hp Johnson, trolls great.<br />Backfire

 

[Trailbum]

Re: 1956 Evinrude 10HP

Thanks so much guys. Yes, a "sneeze" describes the condition perfectly (LOL)!!! I'll be putting it on the boat in about two weeks, so I'll just go ahead and have a carb kit on hand in case it's needed. Good to hear that it isn't ignition related or worse.... Rebuilding the carb looks easy!!! Thanks again for your replies!!!