Lost number 2 cylinder

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  • kflyboy
    XSive
    • Apr 2012
    • 81
    • Lakewood, Colorado

    #1

    Lost number 2 cylinder

    Went for a a ride yesterday about 5 miles. Started back and number 2 began to miss fire. Got the bike home and pulled the plugs out number 2 was soaked with fuel. There was also fuel in the bottom of the air box. Cleaned the plugs and spun the engine with the plugs ground in the fins and got strong spark on all 4. Pulled the carbs out checked for obstruction in number 2 needle and seat nothing to be found. Put it all back together after checking the carbs still had a miss fire on number 2. I put dynatek wires and new vf1000 coils last year. All floats set at 23mm. This all happened suddenly while I was entering the highway under 3/4 throttle. Any ideas or input would be greatly appreciated. This has never happened before.
  • MPittma100
    XS-XJ Guru
    • Aug 2011
    • 2359
    • Atlanta, GA.

    #2
    Fouled Plug

    No doubt there is/was a problem in number 2 carburetor. May not be firing now due to that plug being fouled. Switch no 2 plug with one of the other cylinder plugs.

    If plug is still getting wet, something is still wrong with number 2 carb.
    1981 XS1100H Venturer
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    Chacal Stainless Steel Braided Brake Lines
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    Limie Accent Moves On In 2015

    Mike

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    • wingnut
      XSive Maximus
      • Oct 2005
      • 695
      • NC

      #3
      Kind of sounds like you could have developed a hole in the #2 float.
      wingnut
      81 SH (Daily Ride)
      81 650XJ (Brother in laws bike, Delivered)
      81 650XJ Jane Doe (Son's Ride)
      82 750XJ Project bike (Son in law's future ride)
      81 XS 400

      No man has a natural right to commit aggression on the equal rights of another; and this is all from which the laws ought to restrain him.โ€

      A government big enough to give you everything you want, is strong enough to take everything you have.

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      • kflyboy
        XSive
        • Apr 2012
        • 81
        • Lakewood, Colorado

        #4
        Plugs

        I did try new plugs and still has fuel on number 2. Do y'all think the coil not firing on number 2 could be the problem?

        Comment

        • Schming
          XS-XJ Guru
          • Jul 2009
          • 2070
          • Pittsburgh,PA

          #5
          Try switching the plug wires on the respective coil #3 to #2 and see if #2 fires
          1980 XS1100G "Dolly G" Full Dresser (with a coat of many colors )
          1979 XS1100SF (stock-euro mods planned)
          1984 XV700L Virago (to be hot-modded)
          1983 XJ750MK Midnight Maxim (semi-restored DD)
          1977 XS650D ( patiently awaiting resto)

          Sometimes it takes a whole tank of gas before you can think straight.

          Comment

          • motoman
            Master of XSology
            • Aug 2005
            • 8413
            • Grand Junction, Colorado

            #6
            Originally posted by Schming
            Try switching the plug wires on the respective coil #3 to #2 and see if #2 fires
            You a pick-up coil wire issue under the left sidecover. Remove the cover and use both hands to try and seperate each wire every inch. If insulation stretches, that's the issue. Bettin' on the white wire as the issue.
            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

            • kflyboy
              XSive
              • Apr 2012
              • 81
              • Lakewood, Colorado

              #7
              Was thinking about trying to switch the coils and see if the issue continues. I will also check the left side cover. Any other ideas?

              Comment

              • motoman
                Master of XSology
                • Aug 2005
                • 8413
                • Grand Junction, Colorado

                #8
                Originally posted by kflyboy
                Was thinking about trying to switch the coils and see if the issue continues. I will also check the left side cover. Any other ideas?
                Nope..........you got secondary ignition issues, and a SLIGHT chance THAT carbs pilot jet is STILL plugged up. You'll have to remove THAT pilot jet and use a magnifying glass and small LED lite to inspect its internal portion........period.
                Last edited by motoman; 12-22-2015, 12:44 AM.
                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

                • kflyboy
                  XSive
                  • Apr 2012
                  • 81
                  • Lakewood, Colorado

                  #9
                  Will look into that thanks motoman!

                  Comment

                  • kflyboy
                    XSive
                    • Apr 2012
                    • 81
                    • Lakewood, Colorado

                    #10
                    Originally posted by wingnut
                    Kind of sounds like you could have developed a hole in the #2 float.
                    Forgot to mention that my bike is an 80G with the plastic floats. Never occurred to me check for a hole in the floats when I pulled the carbs looking for the problem. When it warms up again I will check that and the other issues mentioned. Thanks for all the help guys.

                    Comment

                    • motoman
                      Master of XSology
                      • Aug 2005
                      • 8413
                      • Grand Junction, Colorado

                      #11
                      Originally posted by kflyboy
                      Forgot to mention that my bike is an 80G with the plastic floats. Never occurred to me check for a hole in the floats when I pulled the carbs looking for the problem. When it warms up again I will check that and the other issues mentioned. Thanks for all the help guys.
                      They are a solid fiber material............no such thing as getting a hole in them.(assuming those are 1980 or later carbs) Again, as i previously stated, either a secondary ignition issue OR fuel level is to high having an incorrect float height. That static float height IS just a ball-park setting related to acual fuel height in bowl.
                      Last edited by motoman; 12-22-2015, 07:48 PM.
                      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

                      • kflyboy
                        XSive
                        • Apr 2012
                        • 81
                        • Lakewood, Colorado

                        #12
                        If I switch plug wires 2 & 3 on the coils to narrow it down to #2 carb do I need to switch the wires from the harness that plug into the vf1000 could as well?

                        Comment

                        • motoman
                          Master of XSology
                          • Aug 2005
                          • 8413
                          • Grand Junction, Colorado

                          #13
                          To bad you didn't read post#11. ALL you new folks seriously need to read and follow what's stated by us old folks here who have worked on and reidden these ole' scoots for the past 35+yrs..
                          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

                          • Rasputin
                            XS-XJ Super Guru
                            • Apr 2008
                            • 3179
                            • Lacombe, Alberta, Canada

                            #14
                            Originally posted by motoman
                            To bad you didn't read post#11. ALL you new folks seriously need to read and follow what's stated by us old folks here who have worked on and reidden these ole' scoots for the past 35+yrs..
                            Kind of why my replies get pissy after a while and I am not on here as much lately. Owned and worked on an XS1100 since 1979.... Might know a thing or two. Heck the mechanic that assembled my 79 special has me rebuilding his carbs now. By the way he is still a motorcycle mechanic, but he now specializes in HD's.
                            Oh well. We shall wait and see what the solution is...eh!
                            2-79 XS1100 SF
                            2-78 XS1100 E Best bike Ever
                            80 XS 1100 SG Big bore kit but not fully running yet.
                            Couple of more parts bikes of which 2 more will live!

                            Comment

                            • motoman
                              Master of XSology
                              • Aug 2005
                              • 8413
                              • Grand Junction, Colorado

                              #15
                              Originally posted by Rasputin
                              Kind of why my replies get pissy after a while and I am not on here as much lately. Owned and worked on an XS1100 since 1979.... Might know a thing or two. Heck the mechanic that assembled my 79 special has me rebuilding his carbs now. By the way he is still a motorcycle mechanic, but he now specializes in HD's.
                              Oh well. We shall wait and see what the solution is...eh!
                              Easy...........do as has been suggested, FIRST.
                              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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