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  • #16
    Originally posted by XS1100_OEM4ME View Post
    No, if your bike is dieing at idle, it is not the cold weather. Cold weather will require a longer warm up time with the choke on, but once at opperating temp, it will idle fine if all else is correct. Your carbs are causing the problem. I would make sure that the emulsion tubes are crystal clean, and the jets also. Next, I would set the floats to the higest spec. for your bike. Make "SURE" no fuel mix screw tip is broke off in the carb body, then start at 2 1/4 turns out, that is rich, but you can tune down and will help with warm up in your cold temp's. Sync the carbs with your gauge and the valves I told you about and set your idle at around 1200 RPM. If your carbs are realy clean (especialy the emulsion tubes) and you have good fuel flow to them (ie, no lines going down below the bowl hight then back up). After you have it idleing right you can turn the fuel mix screws in 1/4 turn each, then ride for a while and do it again till the idle drops slightly, then back out 1/8th turn, should be good
    Cool Dude! Ill try this right here. But what are emulsion tubes? Fuel lines shouldnt get below the carb bowls? Someone told me that didnt matter. Hmmm And what floatbowl heighth do I need? Do u know? Fuel Mix srew and Pilot screw are they the same thing? Which is where? Tips breaking off inside the carb sounds commen the way you mention it!!!!!!

    About my Carbtune Pro i contacted <morgan@carbtune.com> in England and asked them why mine are missing and for $5 and a self addressed envelope they are gonna send me the rest of whats missing in my kit. If not i go the aquarium stuff route
    '81 Yamama XS1100 5K7 German Model

    What's the difference between erotic and kinky?
    Erotic = using a feather
    Kinky = using the whole chicken

    Comment


    • #17
      Originally posted by anarchy18 View Post
      Cool Dude! Ill try this right here. But what are emulsion tubes?
      The emulsion tubes are what the main jet screws into and the needle drops down into. Once you pull the main jet out and the diaphragm and needle out the emulsion tube van be pushed out from the main jet hole and it will pop out into the intake area.

      Originally posted by anarchy18 View Post
      Fuel lines shouldnt get below the carb bowls? Someone told me that didnt matter.
      Nope should not matter. The pressure of gravity will keep the fuel flowing into the carbs until the fuel level in the tank and lines drops to the level of the T in between the carbs. It can slow the fuel flow slightly (not much) as the fuel level gets lower though.

      Originally posted by anarchy18 View Post
      Hmmm And what floatbowl heighth do I need? Do u know?
      For the American models, might be different for the German one though, it would be 23mm from the float bowl mating surface (gasket removed) to the very top edge of the float without compressing the float.

      Originally posted by anarchy18 View Post
      Fuel Mix srew and Pilot screw are they the same thing? Which is where? Tips breaking off inside the carb sounds commen the way you mention it!!!!!!
      It is very common that the tips of the pilot screws (fuel mix, idle screws, same thing) to break off on the early model carbs because the tips of them are pointed. Here in America they changed the screws in '80 and they went to a blunt tipped screw and then the tips didn't break off like the early ones, so it was no longer and issue. These screws are going to be located right in in the center of the front intake bell on the carb. Yours will most likely (since it is German I am not positive) be just in front of all the choke parts on the carb in the center of the intake bell on the top inside a tower that will have a plug covering the top. You need to remove that plug, if you havent ever removed that plug then most likely your carbs are not clean down there either.

      Originally posted by anarchy18 View Post
      About my Carbtune Pro i contacted <morgan@carbtune.com> in England and asked them why mine are missing and for $5 and a self addressed envelope they are gonna send me the rest of whats missing in my kit. If not i go the aquarium stuff route
      You will most likely get a 4 inch piece of clear tubing with a very small hole down the middle. what you will do it cut it in 4 equal pieces. Then you will cut something like 4 inches off the end of the black hoses and then shove the little clear pieces into the end of the black hose and then put the short black piece onto the other side of the little clear piece. If that made sense.
      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


      • #18
        Usually when you are experiencing running problems it's because of a problem with fueling or ignition, not that really cold weather can't make starting an issue. After you get the engine warmed up, the problem you are having is doutfully the cool weather. I ride in temps quite a bit lower than 0 C.
        Can't beat the smell of gas & oil

        Comment


        • #19
          Don't forget also that the black box need a minimum voltage to fire the plugs (10v?). They can show a "skin charge" but have no real capacity. Roll up to a traffic light and ... nothin! Gel type batteries seem to be even worse for that problem. When they are through, they are through.
          Skids (Sid Hansen)

          Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation.

          Comment


          • #20
            Engaging the choke was the first thing I tried and almost choked on gas fumes and my eyes watered etc after that and it didnt really help her stay running any better either.////////Either way....way rich in the pilot circuit, and not necessarily the jets either.
            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


            • #21
              Originally posted by XS1100_OEM4ME View Post
              You are so correct Sir, I am a Moron, how could I have missed that, of course the Year matters I only have one year now 1979 I apoligize for being so dumb I will stop trying to help others as it is clear I am stupid
              I was just pointing out that he was talking about an 81 which is different and has different carbs than a 79 which I was not sure if you were aware of. I know that some owners of 80+ bikes are not aware of the adjustable needles on the 79 and earlier carbs. I certain did not mean to imply you were a moron as you are clearly an intelligent guy. The whole point of the site is to help each other, cause I don't think any of us knows everything.
              Cy

              1980 XS1100G (Brutus) w/81H Engine
              Duplicolor Mirage Paint Job (Purple/Green)
              Vetter Windjammer IV
              Vetter hard bags & Trunk
              OEM Luggage Rack
              Jardine Spaghetti 4-2 exhaust system
              Spade Fuse Box
              Turn Signal Auto Cancel Mod
              750 FD Mod
              TC Spin on Oil Filter Adapter (temp removed)
              XJ1100 Front Footpegs
              XJ1100 Shocks

              I was always taught to respect my elders, but it keeps getting harder to find one.

              Comment


              • #22
                Originally posted by anarchy18 View Post
                Cool Dude! Ill try this right here. But what are emulsion tubes? Fuel lines shouldnt get below the carb bowls? Someone told me that didnt matter. Hmmm And what floatbowl heighth do I need? Do u know? Fuel Mix srew and Pilot screw are they the same thing? Which is where? Tips breaking off inside the carb sounds commen the way you mention it!!!!!!

                About my Carbtune Pro i contacted <morgan@carbtune.com> in England and asked them why mine are missing and for $5 and a self addressed envelope they are gonna send me the rest of whats missing in my kit. If not i go the aquarium stuff route
                What CAN happen if the fuel lines go below the carb bowls is that sometimes you can get a bubble of air in the line that can cause fuel delivery problems. It does seem to be a rare occurance from what I've seen though. That said, I personally like to run my fuel line from each petcock to the carb set on the other side, it keeps them from getting pinched and makes it easy to do tuneups as it's easy to turn the tank around and put the tank where the seat normally sits facing backwarks. It also tends to make it so they don't go below the carb bowls as well, even though AFAIK it doesn't matter.
                Cy

                1980 XS1100G (Brutus) w/81H Engine
                Duplicolor Mirage Paint Job (Purple/Green)
                Vetter Windjammer IV
                Vetter hard bags & Trunk
                OEM Luggage Rack
                Jardine Spaghetti 4-2 exhaust system
                Spade Fuse Box
                Turn Signal Auto Cancel Mod
                750 FD Mod
                TC Spin on Oil Filter Adapter (temp removed)
                XJ1100 Front Footpegs
                XJ1100 Shocks

                I was always taught to respect my elders, but it keeps getting harder to find one.

                Comment


                • #23
                  +1

                  +1. if it goes below the bowls it makes a "sump" like the sump trap on your sink, it is a place for crap to build up and for air to get traped, it you dont need too, why do it

                  Originally posted by cywelchjr View Post
                  What CAN happen if the fuel lines go below the carb bowls is that sometimes you can get a bubble of air in the line that can cause fuel delivery problems. It does seem to be a rare occurance from what I've seen though. That said, I personally like to run my fuel line from each petcock to the carb set on the other side, it keeps them from getting pinched and makes it easy to do tuneups as it's easy to turn the tank around and put the tank where the seat normally sits facing backwarks. It also tends to make it so they don't go below the carb bowls as well, even though AFAIK it doesn't matter.
                  1979 XS1100 Special (Mad Max, OEM) Current
                  1980 XS1100 Special
                  1990 V Max
                  1982 KZ750 LTD Twin
                  1986 700 FZR Yamaha Fazer (faster then expected)
                  1979 XS750 Special (my 1st Special)
                  1974 CB750-Four



                  Past/pres Car's
                  1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8

                  Comment


                  • #24
                    Originally posted by cywelchjr View Post
                    What CAN happen if the fuel lines go below the carb bowls is that sometimes you can get a bubble of air in the line that can cause fuel delivery problems. It does seem to be a rare occurance from what I've seen though. That said, I personally like to run my fuel line from each petcock to the carb set on the other side, it keeps them from getting pinched and makes it easy to do tuneups as it's easy to turn the tank around and put the tank where the seat normally sits facing backwarks. It also tends to make it so they don't go below the carb bowls as well, even though AFAIK it doesn't matter.
                    Thats sounds like a good idea right there, crossing the lines!!! I have had problems with mine getting pinched just cause I've had as little as 1" or 2" of too much hose. Especially with really cheap thin walled fuel line. Curls up real easy
                    '81 Yamama XS1100 5K7 German Model

                    What's the difference between erotic and kinky?
                    Erotic = using a feather
                    Kinky = using the whole chicken

                    Comment


                    • #25
                      Well this might be the reason my honda has a delayed throttle response?

                      Originally posted by XS1100_OEM4ME View Post
                      +1. if it goes below the bowls it makes a "sump" like the sump trap on your sink, it is a place for crap to build up and for air to get traped, it you dont need too, why do it
                      I have a Honda Sabre where I have to run my fuel line from the tank to below the carb float bowls in order to be able to add a inline fuel filter. The petcock itself used to have a fuel filter attached to the top of it which was up inside the gas tank but that broke off and looked better cause you didnt see it like that funky setup I have now.

                      Theres not much room between the tank and where the fuel lines turn and run under the carbs (maybe like 4 inches) and then up into them.

                      If I dont put enough hose for the inline fuel filter to hang under the carbs the filter will rest against my motor. That can melt the filter or it will scratch my paint job when i ride. EITHER WAY IT LOOKS FUNKY, I NEED AN ALTERNATIVE!!!
                      '81 Yamama XS1100 5K7 German Model

                      What's the difference between erotic and kinky?
                      Erotic = using a feather
                      Kinky = using the whole chicken

                      Comment


                      • #26
                        Originally posted by natemoen View Post
                        The emulsion tubes are what the main jet screws into and the needle drops down into. Once you pull the main jet out and the diaphragm and needle out the emulsion tube van be pushed out from the main jet hole and it will pop out into the intake area.



                        Nope should not matter. The pressure of gravity will keep the fuel flowing into the carbs until the fuel level in the tank and lines drops to the level of the T in between the carbs. It can slow the fuel flow slightly (not much) as the fuel level gets lower though.



                        For the American models, might be different for the German one though, it would be 23mm from the float bowl mating surface (gasket removed) to the very top edge of the float without compressing the float.



                        It is very common that the tips of the pilot screws (fuel mix, idle screws, same thing) to break off on the early model carbs because the tips of them are pointed. Here in America they changed the screws in '80 and they went to a blunt tipped screw and then the tips didn't break off like the early ones, so it was no longer and issue. These screws are going to be located right in in the center of the front intake bell on the carb. Yours will most likely (since it is German I am not positive) be just in front of all the choke parts on the carb in the center of the intake bell on the top inside a tower that will have a plug covering the top. You need to remove that plug, if you havent ever removed that plug then most likely your carbs are not clean down there either.



                        You will most likely get a 4 inch piece of clear tubing with a very small hole down the middle. what you will do it cut it in 4 equal pieces. Then you will cut something like 4 inches off the end of the black hoses and then shove the little clear pieces into the end of the black hose and then put the short black piece onto the other side of the little clear piece. If that made sense.
                        Im starting to understand some stuff alittle better THANKS TO YOU GUYS!!! EVERYTIME I COME TO THIS SITE I LEARN SOMETHING NEW!!!

                        Colortuning, I just heard of it. Is it a must, do I need it, how important is it? Someone told me it dont matter cause it only checks your bike at idle without a load on it. He said its useless and other guys swear on it!!!

                        WHO THINKS I WILL STILL NEED IT after adjusting the pilot screws and synching the carbs the way I've been taught to do it on here without the colortune?
                        '81 Yamama XS1100 5K7 German Model

                        What's the difference between erotic and kinky?
                        Erotic = using a feather
                        Kinky = using the whole chicken

                        Comment


                        • #27
                          Originally posted by anarchy18 View Post
                          Im starting to understand some stuff alittle better THANKS TO YOU GUYS!!! EVERYTIME I COME TO THIS SITE I LEARN SOMETHING NEW!!!

                          Colortuning, I just heard of it. Is it a must, do I need it, how important is it? Someone told me it dont matter cause it only checks your bike at idle without a load on it. He said its useless and other guys swear on it!!!

                          WHO THINKS I WILL STILL NEED IT after adjusting the pilot screws and synching the carbs the way I've been taught to do it on here without the colortune?
                          The colortune is for adjusting your idle screws. If you can set the idle screws by other means then you do not need it.
                          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


                          • #28
                            I use a colortune sometimes just to get the mixture screws in the ballpark, then fine tune from there reading the spark plug(s) color. Instead, when you sync the carbs you can adjust the mix screws to obtain the highest vacuum reading. That usually gets them right on target.
                            2H7 (79) owned since '89
                            3H3 owned since '06

                            "If it ain't broke, modify it"

                            Comment


                            • #29
                              Anarchy,
                              After reading through this string two things come to mind.
                              One - Your're running oil which too thick for your temps, and
                              Two - Since you're apparently starving for fuel at idle, check your tank vent. It's under your tank filler cap. There's a hole in the middle that needs to be clear in order for the tank to "vent" and not cause a vacuum which will prevent the fuel from freeflowing into your carbs. This "starving" typically more evident at higher speeds but it's worth checking. Also, check your plugs to see if they're wet (black and oily) or dry (they look almost unused) they're the best indicator of how much fuel is reaching the cylinders at the different fuel rates.
                              1980G Standard, Restored
                              Kerker 4 - 1
                              850 Rear End Mod
                              2-21 Flashing LED Arrays on either side of license plate for Brake Light Assist, 1100 Lumen Cree Aux Lights,
                              Progressive springs, Showa rear shocks
                              Automatic CCT
                              1980GH Special, Restored
                              Stock Exhaust, New Handlebars, 1" Spacer in Fork Springs, Automatic CCT, Showa Rear Shocks
                              '82 XJ1100 (Sold)
                              Automatic CCT, RC Engineering 4 X 1 Exhaust, K&N Pods, #50 Pilot Jets, YICS Eliminator. Sorely missed.

                              Comment


                              • #30
                                Hey, pulled the plugs they were black and sooty but dry!!! I'll definately check out that vent hole on the tank but I also think its time to pull my carbs and inspect em.
                                Last edited by anarchy18; 12-05-2011, 05:32 AM.
                                '81 Yamama XS1100 5K7 German Model

                                What's the difference between erotic and kinky?
                                Erotic = using a feather
                                Kinky = using the whole chicken

                                Comment

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