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  • #1

    Number 2 cylinder is lean

    Finally getting around to doing some serious work on the XJ1100. Bought it in November with 19K on the odometer & I only put around 200 miles on it before winter storage. I'm getting a set of Jardine Spaghetti exhausts prepped & ready to be ceramic coated. When I removed the MAC 4-1 that came with it I found #2 cylinder was running way lean.





    I know the carbs were way out of adjustment because the idle adjustment screws on 2&3 had been tightened down as far as they could go. I don't have a compression tester but I'm hoping the valves in #2 are not damaged. The PO didn't put any exhaust gaskets in when he installed the MAC 4-1. Sweet...

    To the hopeful, it sure had scary power last year even when horribly maladjusted.

    Thoughts?
    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.
    Tags: None
  • #2
    Did you pull the plugs, do they agree with the exhaust?
    '79 XS11 F
    Stock except K&N

    '79 XS11 SF
    Stock, no title.

    '84 Chevy K-10 "Big Blue"
    GM 350, Muncie SM465, NP208, GM 10 Bolt with 3.42gears turnin 31x10.5 Baja Claws

    "What they do have is an implacable, unrelenting presence and movement that bespeaks massive power lurking behind paint and chrome. They don't wail like a screeching ninja, the don't rumble like a harley. They just growl like a spactic, stressed out badger waiting to rip your face off and eat your soul." Trainzz~RIP~

    Comment

    • #3
      Just pulled them, the order they are is in is 4-3-2-1

      1 & 2 appear quite lean. #4 looks like half&half...


      4 3 2 1

      If I remember correctly, they all were black when I pulled the original plugs, I put the Iridiums in right after I got it home.

      Thoughts on these as compared to the pipes?

      Thanks!
      Last edited by KA1J; 04-29-2011, 10:34 AM.
      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.

      Comment

      • #4
        I would go ahead and clean and tune the carbs then look at the plugs. Float levels and slide operation are critical to a proper fuel mixture. Don't forget to check the valve clearences . All those things have to be right before you can fix a rich or lean condition.
        Slow down and enjoy life. If you are in that much of a hurry, you should have left eariler.
        Current rides:
        80 XS1100SG
        82 JX1100
        83 Venture Royale
        86 V-Max

        Comment

        • #5
          What mlew said and put new NGK stock plugs in to tune and sync AND read plug color (after you internally clean up the carbs) with a throttle chop. Then run the Irids if you want.
          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

          • #6
            I did rebuild the carbs over the winter, I now have to make a jig to hold them properly so I can adjust the float level. Even bought a Dynojet kit for it but didn't install it. I also have a carbtune & colortune to get it synced properly.

            While I'm waiting for the exhaust to be coated I'll check & replace the shims as needed.

            A PO had done a terrible job on it, no exhaust gaskets installed. Two carbs were horribly adjusted. The bolt holding on what was a pristine MAC resonator was loose and the muffler fell off & got gouged (I was going slow so there was only slight scoring). Several bolts were very loose. Sloppy job using liquid tape on the intake manifolds. And much more...

            PITA to undo someone else's wrongdoing when they apparently had no idea how to adjust and care for it properly.
            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.

            Comment

            • #7
              you don't need no stinkin jig! just flip the carburetors over remove the gasket and measure that way. that's how its supposed to be done anyways.
              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

              • #8
                Might double check on those gaskets. Oft times they are there but easily dismissed as not,especially the metal clad ones can get crushed in and look like part of the head then you end up adding new ones over old ones.
                79SF
                XJ11
                78E

                Comment

                • #9
                  On those float levels I'm a stickler on the sight tube method which BTW the XJ manual explicitly uses. I always set by measurement first and check with the tubes before install, even my 79. Float levels are never even just by the measurement. When I finish tweaking the measurements are not all the same but the levels are. I might be anal but my fuel levels are even.
                  79SF
                  XJ11
                  78E

                  Comment

                  • #10
                    Originally posted by SFerinTEXAS View Post
                    On those float levels I'm a stickler on the sight tube method which BTW the XJ manual explicitly uses. I always set by measurement first and check with the tubes before install, even my 79. Float levels are never even just by the measurement. When I finish tweaking the measurements are not all the same but the levels are. I might be anal but my fuel levels are even.
                    He's right, that's the 'official' method... in fact the, that's also the FSM procedure for the '81 XS models. Which makes me wonder... did Yamaha find out after converting to the plastic floats that a simple height adjustment (like for the brass floats) didn't work too well?
                    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

                    • #11
                      Can the 81+ carb bowls be uses in earlier model carbs?
                      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

                      • #12
                        No internal differences I can see.... other than that 'bump' for those rubber plugs needed for some '80 carbs.
                        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

                        • #13
                          I have a spare set of 81 carbs, maybe I will put those bowls on my 78 then to check level easier.
                          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

                          • #14
                            Didn't mean to divert the original thread. On the early bowls I use the drilled out metric grease nipples for hose connections.
                            79SF
                            XJ11
                            78E

                            Comment

                            • #15
                              I found out the reason for the lean #2 anyway; the PO or one of his ilk neglected to put the exhaust gasket in #2 cylinder when he installed the pipes...

                              Man I hope the valves weren't damaged.
                              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.

                              Comment

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