Announcement

Collapse
No announcement yet.

Carb sync/carbtune pics

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Carb sync/carbtune pics

    Our intrepid bwringer stopped by today (12-26-08) with twr1776's carb tuning tools in hand and made gave my bike a Christmas present !

    My bike and I say Thank You !

    Here's some pics and a video.


    This is what we're starting with.
















    Here's the video. Somebody tell me it linked okay, please. Got it all sorted out and the bike's is running great ! Thanks again.

    Store your photos and videos online with secure storage from Photobucket. Available on iOS, Android and desktop. Securely backup your memories and sign up today!
    Larry D
    1980 GS450S
    1981 GS450S
    2003 Heritage Softtail

    #2
    linked great. just sold me on the morgan's gear.

    Comment


      #3
      pretty sweet little video there

      Comment


        #4
        Originally posted by Dave_17954 View Post
        pretty sweet little video there

        Yeah, it could've been longer, but I was still figuring out the video function on the new Christmas camera.


        Larry D
        1980 GS450S
        1981 GS450S
        2003 Heritage Softtail

        Comment


          #5
          I just got my carbtune the other day. Haven't had a chance to use it yet as the running bikes are winterized and stored somewhere else, and the bikes in the garage aren't running yet. Maybe soon though. Pretty slick little unit.

          Comment


            #6
            What's happening in the video?

            Comment


              #7
              so that colortune is where its at, huh? i think im going to buy both.

              Comment


                #8
                thanks for doing the pics and vid
                I have never seen a better demo of how this thing works
                very well done

                Comment


                  #9
                  Originally posted by cyberdork View Post
                  What's happening in the video?

                  The carbtune is basically a see-through spark plug. It allow you to see the spark and tune as needed.

                  Too much blue is rich and too lean is bright yellow, almost white.

                  We tuned until they were yellow with just a slight hint of blue. Maybe a touch rich, but I know where they're set and can make a quarter turn later, if needed.
                  Larry D
                  1980 GS450S
                  1981 GS450S
                  2003 Heritage Softtail

                  Comment


                    #10
                    Very cool, I received my carbtune and colortune about two weeks ago. As soon as Nessism can rescue me enough to get my carbs back together, I'll be trying mine out.
                    It's smoke that make electronic components work.
                    Every time I've let the smoke out by mistake, they never work again.
                    '80 GS250T... long gone... And back!
                    '86 Honda Bol D'Or... very sadly long gone
                    '82 GS1000SZ
                    '82 GS1100GL
                    '01 Honda CBR1100XX BlackBird

                    Comment


                      #11
                      In the video (that's my right foot...), I cranked the idle mixture screw out about half a turn to demonstrate how the flame color turns yellow, then in again to show it turning a nice blue.

                      You want to get the flame a nice blue, then make it a little richer than that for best idle and throttle pickup from idle. I made the flame nice and blue, then backed it out 1/4 turn from there. We may do some more tweaking once we get a break in the weather and can test-ride the bike, but it's very close now.

                      In the video, the spark appears to be missing a beat every so often, but I think that's sort of an artifact of how the video was recorded.

                      We got the mixture screws very close simply by listening to how the engine idled down and how it reacted to "blipping" the throttle rapidly:
                      • If it "hangs", meaning that it tends to return to idle very slowly, that's a sign the idle mixture is too lean.
                      • If it "dips", meaning that it goes below idle speed (or dies) when you release the throttle and then returns back up to idle speed, that's a sign the idle mixture is too rich.
                      • A lean or very rich idle mixture can also cause stumbling when you blip the throttle.
                      • If you have an intake leak, you might also notice the lean symptoms of a "hanging" idle and that the idle speed increases as the engine gets hotter. An intake leak also makes the engine run much hotter than it should.


                      To use these indications, you have to be in the ballpark already -- clean carbs with clean idle passages and a properly sealed intake system, along with a healthy ignition system. If one of these factors is off, then twiddling the idle screws doesn't tell you anything.


                      Those brass vacuum port tubes are from my mercury synchronizer. The Morgan comes with these little plastic tubes that are sort of a pain to deal with. They work fine, but it's just easier to grab hold of the brass tubes.

                      Lastly, you'll note that the vacuum readings aren't totally identical. I think I ended up getting the 3/4 readings a little closer after Larry took the picture, but the important thing to know is that you can't ever really get this absolutely perfect -- you'll make yourself crazy trying to get everything exact.
                      Last edited by bwringer; 12-27-2008, 08:36 PM.
                      1983 GS850G, Cosmos Blue.
                      2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
                      2015 Yamaha FJ-09, Magma Red Power Corrupts...
                      Eat more venison.

                      Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

                      Celeriter equita, converteque saepe.

                      SUPPORT THIS SITE! DONATE TODAY!

                      Co-host of "The Riding Obsession" sport-touring motorcycling podcast at tro.bike!

                      Comment


                        #12
                        Originally posted by Larry D View Post
                        The carbtune is basically a see-through spark plug. It allow you to see the spark and tune as needed.

                        Too much blue is rich and too lean is bright yellow, almost white.

                        We tuned until they were yellow with just a slight hint of blue. Maybe a touch rich, but I know where they're set and can make a quarter turn later, if needed.
                        Is the color chart different for different models with the colortune? i do know that the carbtune has two models.

                        I only ask because when i did my tuning according to the color chart yellow is rich and blue is correct mixture, light blue is lean. I have the twin carbs.

                        I know some like to have a yellow center ring with a blue outer ring to run slightly richer rather than leaner to prevent detonation etc.

                        For example when you blip the throttle it turns yellow because of the extra fuel admitted to the cylinder, then returns to blue when idling steadily.
                        Last edited by Guest; 12-28-2008, 01:34 AM.

                        Comment


                          #13
                          Yes, a nice bright blue is the "correct" idle mixture (most complete burning), but you get the best throttle response when it's a touch richer than that.

                          The same applies to any engine with carburetors, from motorcycles to cars.

                          If you leave the mixture a bit lean, it'll stumble when you try to pick up the throttle. If you're riding hard in the twisties, you need the off-idle transition to be smooth as silk so you can ease into the throttle sooner.
                          1983 GS850G, Cosmos Blue.
                          2005 KLR685, Aztec Pink - Turd II.3, the ReReReTurdening
                          2015 Yamaha FJ-09, Magma Red Power Corrupts...
                          Eat more venison.

                          Please provide details. The GSR Hive Mind is nearly omniscient, but not yet clairvoyant.

                          Celeriter equita, converteque saepe.

                          SUPPORT THIS SITE! DONATE TODAY!

                          Co-host of "The Riding Obsession" sport-touring motorcycling podcast at tro.bike!

                          Comment


                            #14
                            Originally posted by bwringer View Post
                            Lastly, you'll note that the vacuum readings aren't totally identical. I think I ended up getting the 3/4 readings a little closer after Larry took the picture, but the important thing to know is that you can't ever really get this absolutely perfect -- you'll make yourself crazy trying to get everything exact.
                            But it sure is easier to get the readings DAMN close with the Carbtune. I love that the readings don't bounce around like with a mercury stick. Nice, steady readings:

                            85 GS1150E May '06 BOM
                            79 GS1000S Wes Cooley Beast





                            Comment


                              #15
                              Luckily there is an acceptable range they all have to be in to be correct.

                              It's about 1/2 an inch on the scale so long as they are all in this range it makes a world of difference.

                              Comment

                              Working...
                              X