octy to carbs

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  • Jelmo11
    XSive
    • Nov 2011
    • 45
    • Sidney, Ohio

    #1

    octy to carbs

    Ok so I feel kinda dumb but I took my carbs off and cleaned them/rebuilt them and now I forget where the fuel lines go and how they are ran the bike is a 79xs11 special so it does have an octy and id like to keep it so can anyone. Please help on how tto run the fuel lines again please
  • CatatonicBug
    Master of XSology
    • Oct 2008
    • 6117
    • Clinton, UT

    #2
    There should be a diagram under the seat.

    Otherwise, the far left port on the octy (we'll call this #1) goes to the front of the left petcock and has a splitter that runs to the left connection between carbs 1 & 2. #2 goes to the rear of the left petcock. Port #3 connects to the rear of the right petcock. Port 4 runs to the front of the right petcock and has a splitter that runs to the right connection between carbs 3 & 4.

    Be VERY careful about the length of the lines. If you are replacing them, ALWAYS use the old lines as a template to cut new pieces exactly the same lenngth as the old ones. Even 1/2" extra can cause the lines to kink.
    1980 XS850SG - Sold
    1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
    Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
    Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

    Whether you think you can, or you think you cannot - You're right.
    -H. Ford

    Comment

    • jetmechmarty
      Master of XSology
      • Nov 2003
      • 7764
      • Coldwater, Mississippi

      #3


      I modified mine just a bit. I found brass tee fittings at my local hardware store and replaced #18 with them. I also crossed line #20. I ran the left to the right and the right to the left. This gave me more room when taking the tank on and off. (#20 goes to the tees between the carbs) I used new hose and clamps sourced from Mike's XS.

      I installed these between the carburetors:
      Marty (in Mississippi)
      XS1100SG
      XS650SK
      XS650SH
      XS650G
      XS6502F
      XS650E

      Comment

      • fredintoon
        Master of XSology
        • Mar 2004
        • 6795
        • Saskatoon SK

        #4
        Originally posted by Jelmo11
        Ok so I feel kinda dumb but I took my carbs off and cleaned them/rebuilt them and now I forget where the fuel lines go and how they are ran the bike is a 79xs11 special so it does have an octy and id like to keep it so can anyone. Please help on how to run the fuel lines again please
        Hi John,
        now you've seen the fuel line diagram that Marty posted you may realize why my SG's octo was long gone before I ever got the bike.
        Not that it don't work, it's that dumping the thing and using 2 lines instead of 8 is a great example of "Simplificate and add lightness."
        Fred Hill, S'toon
        XS11SG with Spirit of America sidecar
        "The Flying Pumpkin"

        Comment

        • crazy steve
          XS-XJ Guru MODERATOR
          • Jan 2009
          • 7932
          • Beautiful outer Yelm, WA

          #5
          Originally posted by CatatonicBug
          Be VERY careful about the length of the lines. If you are replacing them, ALWAYS use the old lines as a template to cut new pieces exactly the same lenngth as the old ones. Even 1/2" extra can cause the lines to kink.
          Yep, that's a true story... It can be a real nightmare getting all those lines routed and kink-free, that's the big reason the octy disappears so often...
          Fast, Cheap, Reliable... Pick any two

          '78E original owner - resto project
          '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
          '82 XJ rebuild project
          '80SG restified, red SOLD
          '79F parts...
          '81H more parts...

          Other current bikes:
          '93 XL1200 Anniversary Sportster 85RWHP
          '86 XL883/1200 Chopper
          '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
          Cage: '13 Mustang GT/CS with a few 'custom' touches
          Yep, can't leave nuthin' alone...

          Comment

          • Edisto
            XSive
            • Apr 2006
            • 60
            • Roanoke, Va

            #6
            I am fighting that demon now with fuel line length. ARGGGGGF
            1979 XS1100 F
            1980 XS1100 Special--Frankenstein
            1982 XJ1100 Maxium x 2
            1980 Honda CB 900
            1981 Honda CB 900
            1981 Honda CB650x2
            2003 Honda 1300 VTX Retro-sold

            Comment

            • jetmechmarty
              Master of XSology
              • Nov 2003
              • 7764
              • Coldwater, Mississippi

              #7
              Originally posted by Edisto
              I am fighting that demon now with fuel line length. ARGGGGGF
              That's why I went from the left fuel cock to the right carburetors, and the right fuel cock to the left carburetors. It was the easiest way to get the installation free of kinks. Also, my brass tee fittings take up more space than the original plastic ones. The final product is nice and neat. (as well as it can be with all those hoses)
              Marty (in Mississippi)
              XS1100SG
              XS650SK
              XS650SH
              XS650G
              XS6502F
              XS650E

              Comment

              • Jelmo11
                XSive
                • Nov 2011
                • 45
                • Sidney, Ohio

                #8
                Ok guys thanks for the help on octy to petcocks but how do I hook my octy to my carbs. Proplerly ?

                Comment

                • Jelmo11
                  XSive
                  • Nov 2011
                  • 45
                  • Sidney, Ohio

                  #9
                  Is it 20 and 19 to. Carbs??

                  Comment

                  • bikerphil
                    Master of XSology
                    • Jan 2008
                    • 8631
                    • South Flori-DUH

                    #10
                    20 is the two fuel lines to the carbs and 19 is the vacuum hose to the #2 carb boot port.
                    2H7 (79) owned since '89
                    3H3 owned since '06

                    "If it ain't broke, modify it"

                    ☮

                    Comment

                    • Jelmo11
                      XSive
                      • Nov 2011
                      • 45
                      • Sidney, Ohio

                      #11
                      Ok so I have the lines ran from the octy correctly and now I'm stuck my carbs have. 4 ports on them two between the 1 and 2 and 2 more between 3 and. 4 they both have one upper and one lower but what ports do line 20 go into and what are the other two for and I have a hose coming up from what I think is a crank case is that a vent I'm so lost sorry

                      Comment

                      • JasonRedbeard
                        Truly XSive
                        • Dec 2011
                        • 109
                        • Tuscaloosa, AL

                        #12
                        Fuel lines run to the lower T ports between the carbs. Upper T ports are bowl vents and should each have a hose running to a nipple on the air filter housing (assuming you still have the stock housing.)

                        The bigger 1/2" or so vent hose from the engine case also goes to the air filter housing.
                        My Special is as old as I am.

                        Comment

                        • natemoen
                          Master of XSology
                          • May 2010
                          • 8640
                          • Fargo

                          #13
                          Originally posted by JasonRedbeard
                          Fuel lines run to the lower T ports between the carbs. Upper T ports are bowl vents and should each have a hose running to a nipple on the air filter housing (assuming you still have the stock housing.)

                          The bigger 1/2" or so vent hose from the engine case also goes to the air filter housing.
                          +1 He has you covered for those.
                          Nathan
                          KD9ARL

                          μολὼν λαβέ

                          1978 XS1100E
                          K&N Filter
                          #45 pilot Jet, #137.5 Main Jet
                          OEM Exhaust
                          ATK Fork Brace
                          LED Dash lights
                          Ammeter, Oil Pressure, Oil Temp, and Volt Meters

                          Green Monster Coils
                          SS Brake Lines
                          Vision 550 Auto Tensioner

                          In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                          Theodore Roosevelt

                          Comment

                          • fredintoon
                            Master of XSology
                            • Mar 2004
                            • 6795
                            • Saskatoon SK

                            #14
                            Originally posted by JasonRedbeard
                            Fuel lines run to the lower T ports between the carbs. Upper T ports are bowl vents and should each have a hose running to a nipple on the air filter housing (assuming you still have the stock housing.)
                            The bigger 1/2" or so vent hose from the engine case also goes to the air filter housing.
                            Hi John,
                            in addition to what Jason sez; there's the possibility that a dreaded PO Frankensteined a later model airbox onto your bike. Check the spigots the carb vent lines hook up to, the later models have a different carb vent system, there are no upper vent lines and the air box spigots your vent lines plug onto are not bored through. It's the same plastic moulding so you can drill them through yourself.
                            Fred Hill, S'toon
                            XS11SG with Spirit of America sidecar
                            "The Flying Pumpkin"

                            Comment

                            • KA1J
                              XSive Maximus
                              • Oct 2010
                              • 664
                              • Groton, CT

                              #15
                              Originally posted by fredintoon
                              Hi John,
                              now you've seen the fuel line diagram that Marty posted you may realize why my SG's octo was long gone before I ever got the bike.
                              Not that it don't work, it's that dumping the thing and using 2 lines instead of 8 is a great example of "Simplificate and add lightness."

                              How do you keep the same petcocks and simplify the routing? I know you can change petcocks and make it simpler but how to keep the existing ones and still have run, prime, reserve & off available?

                              Gary
                              82 XJ1100 Maxim "hurricane"- DEKA EXT18L AGM battery , NGK BPR6EIX spark plugs, Green Dyna coils, Sylvania SilverStar Ultra H4 bulb, 139 dB Stebel Nautilus air horn, Home-made K&N air filter based on an original paper filter frame, new piston rings, Barnett Clutch Springs, SS braid/Teflon brake lines, TKAT fork brace, rebuilt calipers, master cylinders, new brakes, reupholstered seat, lotsa little things and so many answered questions here.

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