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Carburetor Tune-up Clarification

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  • Carburetor Tune-up Clarification

    I'm going to tune up my carbs when the weather gets nicer out (my god I can't wait) and would like to clarify something and ask a question.

    first off, I just want to make sure I know where the vacuum bleeder nipple things are. They're the cap looking things on the top side of the rubber carb mounts, engine side right? There's a pic at the bottom of the post.

    Another question is the idle mixture screws. I've heard that if you run the engine, screw one in, then slowly back it out the revs should start rising, when they lower again you back off 1/4 to 1/2 turn and go on to the next one. Should I even bother touching these? My bike has the K&N pod filters and a full Yoshi exhaust.

    Thanks for the info!
    Attached Files

  • #2
    Nice pic Kiwiman!!!
    Yes that is where you hook up the synchro..
    About the fuel mix, I've heard lots of tales..
    I set mine up 2 turns from bottom..
    I hear there is a way to do it using a synchro..
    Not sure though.

    You do realize one of you K&N pods fell off..
    :P

    Comment


    • #3
      pod didn't fall of, I took that one off. HOWEVER, I had some work done to it (lots of carbon build up in head, got it removed) and then drove it home from school for 4 hours only to find that the shop didn't tighten any of the pods and the one for cylinder 3 fell off. No idea how long it wasn't on there, I can only imagine.

      If anyone knows of a good shop in the Troy, NY area, let me know. I've since done all of the work myself. I love my bike

      Comment


      • #4
        I haven't done it that way, I started at 1 3/4 turns out and tried different setting until I got it right. Rich vs. Lean that is.

        Factory Pros tech website is one of the best for tuning your carbs. There are links in the Carb Sync section of a great fellow named 771Doug.

        Start here 771 Doug's Website

        B_P,
        What you mean by using the Sync tool you heard from me. Let me clarify. You can adjust them while running if you have the tool to do it. (please see other thread). A shop would use an exhaust gas analyser to check the air/fuel mixture and should adjust the screws accordingly. It really has nothing to do with the sync, other than it needs to be done if you change either air or fuel flow. Then re-sync, and a good shop should do it as part of a sync job.
        AMA member # 224227

        Comment


        • #5
          to get the best air/fuel mixture you can do a process called an IDLE drop. I think I have described this process before on this forum.



          **edited for clarity, and to avoid outright humor** 8)
          TDA Racing/Motorsports
          1982 Honda CB750 Nighthawk, 1978 Suzuki GS750 1986 Honda CBR600 Hurricane; 1978 Suzuki GS1100E; 1982 Honda CB750F supersport, 1993 Suzuki Katana GSX750FP. 1981 Suzuki GS1100E (heavily Modified) http://katriders.com/vb/showthread.php?t=94258
          Who knows what is next?
          Builder of the KOTM Mreedohio september winning chrome project. I consider this one to be one of my bikes also!
          Please look at this build! http://katriders.com/vb/showthread.php?t=91192

          Comment


          • #6
            Yeah Thaz, that is part of the tuning procedure listed on the Factory Pro web site. That is how I adjusted mine.
            AMA member # 224227

            Comment


            • #7
              Meikol2 & THAZKAT
              Meikol2 mentioned the tool used to adjust the screws.
              I have that covered, what I read (about a KZ) was
              at idle (not 1800 RPM) adjust the air/fuel mix and watch the carb vacuum (using the synchro)
              I know about the idle drop method but this one
              seemed more acurate, however it may not work with a Suzi, and I don't know the exact method.
              I'll have to dig up the magazine I read it in.

              I will differ to Thazkat as he is edumacated..

              Comment


              • #8
                Honda mfg. uses the IDLE drop as a factory adjustment for all of their bikes. After doing an IDLE drop it has been proven that the emmisions is lower than just doing a carb sync.


                **Got you again, ThAzKat!**
                No, I am not your idol!!!
                TDA Racing/Motorsports
                1982 Honda CB750 Nighthawk, 1978 Suzuki GS750 1986 Honda CBR600 Hurricane; 1978 Suzuki GS1100E; 1982 Honda CB750F supersport, 1993 Suzuki Katana GSX750FP. 1981 Suzuki GS1100E (heavily Modified) http://katriders.com/vb/showthread.php?t=94258
                Who knows what is next?
                Builder of the KOTM Mreedohio september winning chrome project. I consider this one to be one of my bikes also!
                Please look at this build! http://katriders.com/vb/showthread.php?t=91192

                Comment


                • #9
                  who was that mystery man??

                  Comment


                  • #10
                    how does the Idle drop method work? I searched but couldn't find anything. Is it similar to the method I mentioned, adjust screw to get the maximum suck on the manometer?

                    Comment


                    • #11
                      hmmm.... does this work?
                      http://www.nightrider.com/biketech/carbadjust.htm

                      Comment


                      • #12
                        Kiwiman, did you go to 771doug's website I linked above? Look at the Jet Kit page or below for the link to the FactoryPro Tech page, specifically item #4.


                        CV Carb Tuning
                        AMA member # 224227

                        Comment


                        • #13
                          Check 771's site out. I will get back with a large post on the exact adjustments.
                          TDA Racing/Motorsports
                          1982 Honda CB750 Nighthawk, 1978 Suzuki GS750 1986 Honda CBR600 Hurricane; 1978 Suzuki GS1100E; 1982 Honda CB750F supersport, 1993 Suzuki Katana GSX750FP. 1981 Suzuki GS1100E (heavily Modified) http://katriders.com/vb/showthread.php?t=94258
                          Who knows what is next?
                          Builder of the KOTM Mreedohio september winning chrome project. I consider this one to be one of my bikes also!
                          Please look at this build! http://katriders.com/vb/showthread.php?t=91192

                          Comment


                          • #14
                            http://www.factorypro.com/tech/carbtun.html

                            Factory Carb site...all you will ever need or want to know. 8)
                            My first aid kit comes with lights and siren

                            But sir, we are Navy SEALs, we are supposed to be surrounded...

                            Comment


                            • #15
                              First off, thank you idol gods. lol

                              second factory pro does explain about all you need. Any problems call Ivan.
                              TDA Racing/Motorsports
                              1982 Honda CB750 Nighthawk, 1978 Suzuki GS750 1986 Honda CBR600 Hurricane; 1978 Suzuki GS1100E; 1982 Honda CB750F supersport, 1993 Suzuki Katana GSX750FP. 1981 Suzuki GS1100E (heavily Modified) http://katriders.com/vb/showthread.php?t=94258
                              Who knows what is next?
                              Builder of the KOTM Mreedohio september winning chrome project. I consider this one to be one of my bikes also!
                              Please look at this build! http://katriders.com/vb/showthread.php?t=91192

                              Comment

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