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Holes drilled in my exhaust :-O

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  • #1

    Holes drilled in my exhaust :-O

    So I have had this bike for about 2 months, haven't really been able to drive it yet due to a really bad stumble between about 1500 - 5000 RPM. This past weekend I pulled the carbs off cleaned/bench synced and then put them back on. I tried to sync the carbs but I couldn't really get it, but even with the carbs not perfect the bike ran 100X better than it did, no more stumbling. I don't really know what I am doing so it could either be that or it could be because of three little 1/8 inch holes that one of the PO's had drilled in the end of the right side exhaust pipe.

    So after I put the bike back together I bought some high heat epoxy putty and I filled in the holes in the right exhaust (I also changed the fuel filters but I don't think that is my problem) and now when I took the bike out to ride it the stumble is back.

    My question is can those three little holes make that much of a difference to bring that stumble back or should I go back and look at something else.

    Thanks in advance!
    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
    Tags: None
  • #2
    Hmmm .... is this a factory exhaust? IIRC, a factory Special exhaust has an eighth inch hole in the pipe just before the muffler as a condensation drain ...
    80G Mini-bagger
    VM33 Smooth bores, Pods, 4/1 Supertrapp, SS brake lines, fork brace

    Past XS11s

    79F Stone stocker and former daily driver, sold May '10 now converting for N.O. to cafe style
    79SF eventually dismantled for parts
    79F Bought almost new in 80, sold for a house
    79F The Ernie bike sold to a Navy dude summer 08
    79SF Squared-off Special, Vetter/Bates tour pkg., Mikes XS coils, G rear fender and tail light. Sold June 09

    Comment

    • #3
      Sorry I should have stated that. No it is an aftermarket 4 to 2 not sure what it is though.
      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

      • #4
        anyone have any thoughts?
        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

        • #5
          Originally posted by natemoen View Post
          I tried to sync the carbs but I couldn\'t really get it.... My question is can those three little holes make that much of a difference to bring that stumble back or should I go back and look at something else.
          What problem did you encounter syncing the carbs? If they are out, it could definitely contribute to a stumbling issue. Three drilled holes in your exhaust I doubt would throw it off so much that it would run like crap. What do your plugs look like?
          2H7 (79) owned since '89
          3H3 owned since '06

          "If it ain't broke, modify it"

          ☮

          Comment

          • #6
            Originally posted by bikerphil View Post
            What problem did you encounter syncing the carbs? If they are out, it could definitely contribute to a stumbling issue. Three drilled holes in your exhaust I doubt would throw it off so much that it would run like crap. What do your plugs look like?
            Its more just the fact that I don't really know what I am doing, when I am doing the sync.
            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

            • #7
              Hi Nathan,
              syncing the carbs isnt to hard, would be easier if someone
              can show you if not and your using vac guages,

              heres what to do
              1st you want to callibrate the guages,
              i do this by removing one of the carb inlet rubbers
              and attaching the guages 1 at a time, you want the guages
              to read the same, adj is made by removing the lens cover and adj
              the small screw on the face plate.
              once the guages are calibrated
              connect the 4 tubes to the 4 inlet rubbers,
              and adj the dampers to prevent the needles from jumping xsecively,
              then adj carbies using the sync srcews you used to do the bench sync,
              1 and 2 then 4 to 3, then adj the left bank to the right bank and your done.
              pete


              new owner of
              08 gen2 hayabusa


              former owner
              1981 xs1100 RH (aus) (5N5)
              zrx carbs
              18mm float height
              145 main jets
              38 pilots
              slide needle shimmed .5mm washer
              fitted with v/stax and uni pod filters

              [url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]

              Comment

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