vaccume advance

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  • Nightengale
    XSive Maximus
    • Jun 2011
    • 521
    • Hampton, VA.
    #1

    vaccume advance

    I have fj1100 carbs on my bike and love them, and i am finally getting around to making them work wiith the vaccume advance. The only question i have is that i have read to put a jet in the line to make it work properly, but i know dont know what size or kind of jet to use. Any help woould be appreciated. Also for those that are familiar with my bike i have some baffles on order as well.
    xs1100 hartail bobber

    http://i1169.photobucket.com/albums/...-38-36_563.jpg
    Tags: None
    • motoman
      Master of XSology
      • Aug 2005
      • 8413
      • Grand Junction, Colorado
      #2
      Originally posted by Nightengale
      I have fj1100 carbs on my bike and love them, and i am finally getting around to making them work wiith the vaccume advance. The only question i have is that i have read to put a jet in the line to make it work properly, but i know dont know what size or kind of jet to use. Any help woould be appreciated. Also for those that are familiar with my bike i have some baffles on order as well.
      Any of the small Mikuni or Kiehn jets in the 40 range oughta' dampen the cyl. pulses. Just make sure whatever style jet used fits tightly in hose.
      81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

        Comment

        • Nightengale
          XSive Maximus
          • Jun 2011
          • 521
          • Hampton, VA.
          #3
          thanks

          Originally posted by motoman
          Any of the small Mikuni or Kiehn jets in the 40 range oughta' dampen the cyl. pulses. Just make sure whatever style jet used fits tightly in hose.
          that helps alot. i have some old kz440 carbs laying around i think i will check them out to see what size they have in them.
          xs1100 hartail bobber

          http://i1169.photobucket.com/albums/...-38-36_563.jpg

            Comment

            • Shockman54
              Truly XSive
              • Feb 2012
              • 145
              • Minneapolis, MINN.
              #4
              i replaced the vacuum line on mine because it had a hole in it, where exactly am i supposed to place this jet? i had no idea there was one in there in the first place...
              1979 xs special, just finished the top end rebuild and then i still have lots of work.
              progress thus far...
              http://s1268.photobucket.com/albums/...t=IMAG0202.jpg

              "If it runs bad, it's usually the carbs. If the tires go flat, I suspect the carbs. If the wind blows the bike over, the carbs were probably to blame. If my wife yells at me about something, I tell her to talk to the carbs" -Incubus

                Comment

                • Nightengale
                  XSive Maximus
                  • Jun 2011
                  • 521
                  • Hampton, VA.
                  #5
                  not one

                  Originally posted by Shockman54
                  i replaced the vacuum line on mine because it had a hole in it, where exactly am i supposed to place this jet? i had no idea there was one in there in the first place...
                  There's not a jet in the original line, and you don't need one. I have different carburetors on my bike, that wasn't set up for the vacuum advance on our bikes, so the jet in the vacuum advance line, is something that I need to make it work with my carburetors.
                  xs1100 hartail bobber

                  http://i1169.photobucket.com/albums/...-38-36_563.jpg

                    Comment

                    • TADracer
                      XS-XJ Guru
                      • May 2006
                      • 1417
                      • Kenner, Louisiana USA
                      #6
                      I have tapped my Keihin carbs from a ZRX1200 and found the vacuum pulsing because it was nearly impossible to drill a hole small enough to act as a damper. I used an old pilot jet and screwed it right into this plastic fitting I used to connect the line to the carb.

                      Mike Giroir
                      79 XS-1100 Special

                      Once you un-can a can of worms, the only way to re-can them is with a bigger can.

                        Comment

                        • Nightengale
                          XSive Maximus
                          • Jun 2011
                          • 521
                          • Hampton, VA.
                          #7
                          Cool thanks for the help
                          xs1100 hartail bobber

                          http://i1169.photobucket.com/albums/...-38-36_563.jpg

                            Comment

                            • motoman
                              Master of XSology
                              • Aug 2005
                              • 8413
                              • Grand Junction, Colorado
                              #8
                              Originally posted by Shockman54
                              i replaced the vacuum line on mine because it had a hole in it, where exactly am i supposed to place this jet? i had no idea there was one in there in the first place...
                              There wasn't, the vacuum tube on #2 carb of the original Mikunis was already 'pin-holed' at its base.
                              81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

                                Comment

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