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fuel filters - vacuum lines?

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  • fuel filters - vacuum lines?

    I am considering adding two inline fuel filters between the bowls and both fuel feeds (Prime / ON, is this a good idea The Oxy vacuum line is hooked to one of the intake manifolds and the ing. advance is hooked to the one carb. body with a vac tube, correct?
    1979 XS1100 Special (Mad Max, OEM) Current
    1980 XS1100 Special
    1990 V Max
    1982 KZ750 LTD Twin
    1986 700 FZR Yamaha Fazer (faster then expected)
    1979 XS750 Special (my 1st Special)
    1974 CB750-Four



    Past/pres Car's
    1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

  • #2
    Yes, it is a good idea to run fuel filters, not much room though with the octy in there so run some small ones. Careful not to pinch fuel lines when the tank is in position. Octy to carb boot manifold vacuum, vac advance to ported vacuum on the #2 carb body.
    2H7 (79) owned since '89
    3H3 owned since '06

    "If it ain't broke, modify it"

    Comment


    • #3


      I run two Visu Filters between the carb bodies and with the "octy" valve. Not too much of a challenge to fit them while replacing my fuel lines.

      I bought mine at my local bike shop.
      Marty (in Mississippi)
      XS1100SG
      XS650SK
      XS650SH
      XS650G
      XS6502F
      XS650E

      Comment


      • #4
        The dreaded flood is back!!!

        Well, got them all done with new XV920 needle kits and new in-line filters, hooked everything back up, and presto GAS POORING OUT THE CARBS AGAIN. Pulled the vent lines, GAS STILL POORING OUT OF THE CARBS AGAIN. Included is a photo of my work (please note these were 32 years old and had lived outside for years when I started on them, and looked nothing like they do now) I am as precise with the insides as I am with the outsides, set all floats with a mic. slide rule and set float max range to just past open on new needles and nothing is binding

        Here is what they look like if this link comes through:

        http://i955.photobucket.com/albums/a...0-22-11010.jpg
        1979 XS1100 Special (Mad Max, OEM) Current
        1980 XS1100 Special
        1990 V Max
        1982 KZ750 LTD Twin
        1986 700 FZR Yamaha Fazer (faster then expected)
        1979 XS750 Special (my 1st Special)
        1974 CB750-Four



        Past/pres Car's
        1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

        Comment


        • #5
          Did you tap on all 4 float bowls on initial filling? Does the leak stop when tapping on the float bowls? Those 2 hoses you have on the upper T's are running to the airbox or remaining open, correct?
          Last edited by bikerphil; 10-22-2011, 05:38 PM.
          2H7 (79) owned since '89
          3H3 owned since '06

          "If it ain't broke, modify it"

          Comment


          • #6
            Yes

            Originally posted by bikerphil View Post
            Did you tap on all 4 float bowls on initial filling? Does the leak stop when tapping on the float bowls?
            Yes, didn't help. It looks like the leak is only on the right two (wich could mean only one is leaking as the two are linked0 Fuel comes out of the vent hose when I removed the carbs and bench tested tonight, going to pull the bowls and bench test one side at a time pushing the floats up with my fingers
            1979 XS1100 Special (Mad Max, OEM) Current
            1980 XS1100 Special
            1990 V Max
            1982 KZ750 LTD Twin
            1986 700 FZR Yamaha Fazer (faster then expected)
            1979 XS750 Special (my 1st Special)
            1974 CB750-Four



            Past/pres Car's
            1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

            Comment


            • #7
              Yep, it sounds like a float is still hanging up or possibly the float valve washer not sealing.
              2H7 (79) owned since '89
              3H3 owned since '06

              "If it ain't broke, modify it"

              Comment


              • #8
                nice work on those carbs...how long did that take?
                Nick

                1979 XS11 F,Yamaha fairings w/hard bags, TC's fuse box, K&N air filter

                1982 Virago 750 (it's alive!)

                1979 XS 11 F, Windjammer IV, Samsonite luggage cases(another rescue)

                Comment


                • #9
                  Carbs

                  Originally posted by mikubuilder View Post
                  nice work on those carbs...how long did that take?
                  Thanks, about an hour polishing, 1/2 hour cleaning + overnight soak of hard parts, 1 hour rebuilding and setting floats and assembly
                  1979 XS1100 Special (Mad Max, OEM) Current
                  1980 XS1100 Special
                  1990 V Max
                  1982 KZ750 LTD Twin
                  1986 700 FZR Yamaha Fazer (faster then expected)
                  1979 XS750 Special (my 1st Special)
                  1974 CB750-Four



                  Past/pres Car's
                  1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

                  Comment

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