1953 Vicking 12D10V surging at high speed

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  • September 2, 2016 at 3:56 pm #5139
    billy-t
    Participant

      Hi Guys

      I had been on a while back and thought that I had the motor running okay. However I think I overtightened the packing nut on the high speed jet as I had the gasket material squeeze out. I have ordered a new carb kit from discount marine, but have not received or installed any of it yet.

      Before I did that I thought it was running well in the barrel, but after I over tightened, the motor now surges at high speed. Would this be causing it or should I be looking at other reasons for why this is happening. Also when I rebuild the carb I just used the best carb/body gasket that I had from my OMC kits as this gasket was NLA, would this allow air and cause my symptoms?

      It is cosmetically in good shape, has good compression and starts and runs well at the lower speeds I just want to get he high speed issue fixed.

      Thanks for any suggestions to help me source and correct the issue.

      Billy T

      September 2, 2016 at 4:22 pm #43185
      frankr
      Participant

        1. Do you have enough gas in the tank? They can fool you when you look in there and see gas, but it’s all at the rear, not enough up where the fuel valve is.

        2. I don’t know, does that one have the sintered fuel filter? Notorious for causing starvation.

        3. By any chance has somebody installed the wrong size float valve? It needs the one with a huge hole through it.

        September 2, 2016 at 5:16 pm #43186
        vintin
        Participant

          May be just a little lean on the high speed needle.

          Fatten it up just a tickle.

          September 2, 2016 at 6:25 pm #43187
          billy-t
          Participant

            Okay good, thanks for the suggestions, I will look at all of that to make sure to rule them out. Just not sure what is meant by the float valve that Frank mentioned. I am a novice at best so I just need clarification on what that is.

            Thanks BT

            September 2, 2016 at 6:54 pm #43188
            wedgie
            Participant

              September 2, 2016 at 6:55 pm #43189
              frankr
              Participant

                As the float rises and drops in the carburetor, it operates a valve that controls the incoming fluid (also often called a needle & seat assy). You have a Tillotson carburetor and they made those seats in various diameters, all of which will physically fit. But the ones with a small diameter seat won’t allow the gas to flow into the carburetor as fast as it is consumed.

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