Announcement

Collapse
No announcement yet.

Carb Rebuild Gone Bad

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Carb Rebuild Gone Bad

    I've been having problems since rebuilding my carbs on my RX. I can't get it above 4800 RPM when the pump is loaded (in water), although on the hose it will rev to 6000+. I've gone thru the carbs, passed all the tests listed in my manual pertaining to the carbs.
    * pulse diaphragm holds 4psi for 30 seconds
    * suck & blow test of pump diaphragms
    * N&S hold 10 psi for 30 seconds
    * popoff at 17 psi, leak back to 12 and hold.
    * N&S lever at same level as carb body.

    From the plugs, it looks like at the low speeds I’m running, the mag side is running rich and the pto is running lean.

    One post I found said that the Fuel Pumps' Clear Plastic diaphragms needed to be installed with the "marked//lined" side up/out. I thought the lines were just for making the clear plastic pieces easy to see. Is this a critical factor in rebuilding the pump?

    I also wanted to make sure I plumbed the PTO carb correctly so I drew a diagram so I could put it back together correctly. This is how I have it. The fuel feed from the mag carb to the pto carb connects a fitting on the carb body, while the return line from the pto carb hooks to the connection on the pto cover labeled “fuel” that is in the same position as the pulse line on the mag carb. This seems contrary to the lines shown on this cover that depict the direction of fuel flow.

    Thanks for the help.

    Jim

  • #2
    Re: Carb Rebuild Gone Bad

    "fuel" marking usually means a fuel inlet... from the fuel pump. The return line show go from the mag carb back to the fuel tank.

    Dont even start it until Bryan helps you get your plumbing straight.
    97 venture11/1200, 01gp12r stage1, 02F12X
    dav_dman@yahoo.com

    Comment


    • #3
      Re: Carb Rebuild Gone Bad

      Take a picture, I don't even want to guess by a description how you have it plumbed.

      The check valves are slightly cupped, the mark denotes proper side up. If it's pumping, it's working.

      17 psi is WAY too low for a stock RX. DO you have any mods?
      SBT Tech Support is here to help with your problems.
      We try to answer each question quickly and accurately.
      Please do not use Private Messaging for Tech Support, use the forums.

      Comment


      • #4
        Re: Carb Rebuild Gone Bad

        Yes, I have prok F/A with N&S 2.3. I'll take a picture and post it.

        If I were to try and describe it again. I would say this. Is the return gas line connector for the PTO carb located on the "intake side" cover plate of the carb. I say intake because this is the area where the pump is located on the mag carb. This cover plate is also used on the mag carb over the pump except it has "pulse" written on it.



        Jim

        Comment


        • #5
          Re: Carb Rebuild Gone Bad

          Go to the tech articles and view the 951 Install guide - there are plenty of carb pictures.
          SBT Tech Support is here to help with your problems.
          We try to answer each question quickly and accurately.
          Please do not use Private Messaging for Tech Support, use the forums.

          Comment


          • #6
            Re: Carb Rebuild Gone Bad

            Sounds to me like you have the retun line connected properly from one carb to the other.
            Bill O'Neal <br>
            WCM
            <a href="http://www.watercraftmagic.com"

            Comment


            • #7
              Re: Carb Rebuild Gone Bad

              stuck at 4800 sounds more like RAVES are not opening
              PRIDE IN SERVICE<br /> <img src="http://www.sbtontheweb.com/images/forposts/4609/1.jpg" alt=" - " />

              Comment

              Working...
              X