1941 Neptune Muncie Carb-Reed issue

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  • August 14, 2021 at 4:32 am #244867
    NeptuneMadness
    Participant

      Hey guys, I have a 1941 1.5hp neptune, I rebuilt, I got it to COUGH! but it isn’t sucking in fuel. I put new rings on it. I think the reed is way to stiff! It has good compression, but the reed plate takes a lot to move it, even by hand. I mean, it is 80yrs old! I can see it not being super flimsy, and the metal may have stiffened over the years? What other metal would be a good replacement? Be awesome to get it to fire once.

      August 14, 2021 at 8:48 am #244873
      Buccaneer
      Participant

        US Member

        I’m not sure what the reeds look like on your motor, but I’m guessing it would be a challenge
        to make reeds for any motor, cutting them out, drilling, etc., and keeping them flat and true.

        Are your crankshaft bushings in good shape with no side play in the crankshaft, and
        the crankcase otherwise sealed tight?

        Prepare to be boarded!

        August 14, 2021 at 4:45 pm #244892
        Monte NZ
        Participant

          International Member

          You might like to try starting it with an electric drill.
          If you can get it running, you could then try adjusting the fuel mixture needle.

          However, the motor could well start and run at high speed, but die when you reduce the revs to idle, which
          like Bucaneer said, it could indicate that the crankcase bearing is worn resulting in lack of suction through the reeds.

          I had a similar problem with a 2hp Yamaha earlier this year. Unfortunately, in my case, the high cost of repair resulted in the motor being sold for parts.

          Monte NZ

          August 14, 2021 at 5:31 pm #244893
          joecb
          Participant

            US MEMBER PAY BY CHECK

            2X what Bucc said… the very small motors are extremely sensitive to poor crankcase compression. Try using a richer oil mix, and maybe heavier weight oil, just to see if that helps. Even 8 to 1 mix will be OK

            Joe B

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