FJ1200 puzzler

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  • planedick
    XS-XJ Guru
    • Mar 2005
    • 2068
    • Yorba Linda, California

    #1

    FJ1200 puzzler

    Owner has aftermarket pipes, pretty much straight thru, dynojet kit, original 110 mains replaced with 112 and needle replaced with one with clips for changing height.

    First time it was brought to me it was without the original jets or the original springs so I wasn't sure what had been done. I raised the needles and it went from not running at all except with the enrichment circute full on, to running good enough to scare the s**t outa me.

    Well, almost a year later and it's back with the same symptons. Won't run at all except with full enrichment. Changed the jets to 114 and test run was good except for above 5000. I guess I will go with the 118 jets in the kit.

    The real problem is what is slowly changing. Owner said it was OK at first, but steadly got slower and slower until it wouldn't run at all. I can't think of what would slowly change like that???????

    PS I'm told the owner rides like it was a Hardly, low rpm's, puttin' around......
    You can't stay young forever, but you can be immature for the rest of your life...

    '78E "Pathfinder" Show bike...
    Lovingly restored by Dave Delzell
    Drilled airbox
    Tkat fork brace
    Hardly mufflers
    late model carbs
    Newer style fuses
    Oil pressure guage
    Custom security system
    Stainless braid brake lines
  • wa407mpp
    XSive Maximus
    • Jul 2007
    • 717

    #2
    Did he let it set a long time with gas in the carbs?
    Fastmover
    "Just plant us in the damn garden with the stupid
    lion". SHL
    78 XS1100e

    Comment

    • planedick
      XS-XJ Guru
      • Mar 2005
      • 2068
      • Yorba Linda, California

      #3
      Riding

      He's been riding it regular, besides, I've already had the carbs off and apart for cleaning and rejetting twice so far this time. Something is slowly changing over time and I can't think what it might be. Good compression all across and good spark and the plugs look like the mix has been good. Luckily the bike comes with a service manual and a complete service record.
      You can't stay young forever, but you can be immature for the rest of your life...

      '78E "Pathfinder" Show bike...
      Lovingly restored by Dave Delzell
      Drilled airbox
      Tkat fork brace
      Hardly mufflers
      late model carbs
      Newer style fuses
      Oil pressure guage
      Custom security system
      Stainless braid brake lines

      Comment

      • LoserShoes
        XSive Maximus
        • Apr 2005
        • 524
        • Bangor Maine

        #4
        Sounds like an air leak, maybe the carb holders?

        Steve
        80 XS1100G Standard - YammerHammer
        73 Yamaha DT3 - DirtyHairy
        62 Norton Atlas - AgileFragile (Dunstalled) waiting reassembly
        Norton Electra - future restore
        CZ 400 MX'er
        68 Ducati Scrambler
        RC Planes and Helis

        Comment

        • FJ111200
          XStremely XSive
          • Oct 2007
          • 317
          • Crewe, Cheshire, UK

          #5
          Air filter clogged up?

          Comment

          • planedick
            XS-XJ Guru
            • Mar 2005
            • 2068
            • Yorba Linda, California

            #6
            New filter

            Can see right through air filter, no obstruction. Using propane I couldn't see any leaks around the carb holders.
            You can't stay young forever, but you can be immature for the rest of your life...

            '78E "Pathfinder" Show bike...
            Lovingly restored by Dave Delzell
            Drilled airbox
            Tkat fork brace
            Hardly mufflers
            late model carbs
            Newer style fuses
            Oil pressure guage
            Custom security system
            Stainless braid brake lines

            Comment

            • wa407mpp
              XSive Maximus
              • Jul 2007
              • 717

              #7
              bad gas, maybe water?
              Fastmover
              "Just plant us in the damn garden with the stupid
              lion". SHL
              78 XS1100e

              Comment

              • Montreux_Blue
                XS-XJ Guru (Deceased)
                • May 2008
                • 1143
                • Longitude: -85° 57' 43" Latitude: 37° 52' 55"

                #8
                Clogged fuel cock?
                http://www.myspace.com/i_give_you_power

                1980 XS11 Special - chopped, dropped and OCTY is still installed - NOW IT'S FOR SALE! $1,800 OBO


                Famous Myspace quote:

                "Don't mess with TEXAS! It's not nice to pick on retards."

                It's funny because I am from TEXAS!

                Comment

                • planedick
                  XS-XJ Guru
                  • Mar 2005
                  • 2068
                  • Yorba Linda, California

                  #9
                  Gas

                  New gas and it has a fuel pump with new filter and it does pump real good. Don't ask how I know.............
                  You can't stay young forever, but you can be immature for the rest of your life...

                  '78E "Pathfinder" Show bike...
                  Lovingly restored by Dave Delzell
                  Drilled airbox
                  Tkat fork brace
                  Hardly mufflers
                  late model carbs
                  Newer style fuses
                  Oil pressure guage
                  Custom security system
                  Stainless braid brake lines

                  Comment

                  • FJ111200
                    XStremely XSive
                    • Oct 2007
                    • 317
                    • Crewe, Cheshire, UK

                    #10
                    Which model is it mate? 1TX, 3CV or 3XW?

                    Sorry they are the European models. Still, let me know if you can, i'm looking at the manual here with all the model codes.
                    Last edited by FJ111200; 06-26-2008, 06:54 AM.

                    Comment

                    • madmax-im
                      Master of XSology
                      • Sep 2007
                      • 6753
                      • Southern Comfort...Wendell NC

                      #11
                      well whats left if it isnt fuel or its delivery?maybe something electrical?
                      1980 XS650G Special-Two
                      1993 Honda ST1100

                      Comment

                      • egsols
                        XS-XJ Guru
                        • Jan 2006
                        • 1090
                        • Barrie, Ontario, Canada

                        #12
                        needle replaced with one with clips for changing height.

                        I raised the needles and it went from not running at all except with the enrichment circute full on, to running good enough to scare the s**t outa me.
                        If it is slowly getting worse over time, could it be that the needles are wearing? JAT
                        Ernie
                        79XS1100SF (no longer naked, now a bagger)
                        (Improving with age, the bike that is)

                        Comment

                        • FJ111200
                          XStremely XSive
                          • Oct 2007
                          • 317
                          • Crewe, Cheshire, UK

                          #13
                          Another one according to the Haynes book of lies is, and don't know how true, and quote,
                          "Engine oil viscosity too high. Using a heavier oil than the one recommended can damage the oil pump or lubrication system and cause drag on the engine".
                          Mmmm.

                          Comment

                          • snowdog51
                            XStremely XSive
                            • May 2006
                            • 348
                            • st. paul ,mn

                            #14
                            fj

                            perhaps the exhaust is going bad needing more fuel thus larger jets

                            bill
                            bill hane

                            Comment

                            • planedick
                              XS-XJ Guru
                              • Mar 2005
                              • 2068
                              • Yorba Linda, California

                              #15
                              Can't find a way

                              How is it possible to hook up the crankcase vent to the airbox after I put it back on? No possible way to access it and can hardly see it even.....
                              You can't stay young forever, but you can be immature for the rest of your life...

                              '78E "Pathfinder" Show bike...
                              Lovingly restored by Dave Delzell
                              Drilled airbox
                              Tkat fork brace
                              Hardly mufflers
                              late model carbs
                              Newer style fuses
                              Oil pressure guage
                              Custom security system
                              Stainless braid brake lines

                              Comment

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