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Connecting a Tachometer For Carb Tuning

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  • #16
    Originally posted by abhijeet080808 View Post
    Connect it to the pulse wire from another Pulsar and see.

    You was right the tacho was the culprit.
    I caught hold of another one & it worked on my HH Super Splendor & M800

    Now how do I make it work for a NV because it is a 2 stroke engine.

    I got the Data Sheet of the main IC CS8190ENF16.
    4shared.com - document sharing - download CS8190ENF16__Data Sheet.pdf
    I know for shore that 2 resistance are to be changed one is variable (220 k) and the other fixed (200 k)

    I can't figure how to calculate the value for these resistance to be changed although I have the formula.


    Any idea's
    A Bird in the Bush is Worth, 2 in the Hand, cause
    Pleasure lies in Pursuit, not in Possession

    Comment

    • #17
      sorry for late info

      Originally posted by zmint View Post
      I think bajaj pulsar is a CDI equipped bike. (I got the tacho from one of these bikes)

      You mean the PULSE signal(BLUE WIRE) should get around 100v DC.

      but on the Coil positive input, I think it is 12V ?
      any how I tried connecting :
      brown = Battery +ve
      black yellow = Battery -ve
      blue = cdi OUT to ignition coil IN i.e. +ive of Coil.

      But nothing happened..
      Please Help ...
      Bro I am sorry for my wrong info...I totally forgot to tell ya... n infact was confused in few things.... any ways....
      Brown wire = battery +ve
      Black and yellow = pulse wire which goes to IG coil
      Blue = battery -ve
      the thing will start immediatly... since i changed the wire code for my help so was not able to recollect the wiring diagram...
      secondly there is one 100K preset on the tacho.. which is for changing the pulse delay..right now i am working on it... will let you know...

      n main thing u will live 100yrs... coz when i started working ontacho i was thinking about u only...lol
      please forgive me for lil misguiding
      "CorePower"
      Motorcycle Performance
      Pune

      Comment

      • #18
        Wow, man! You actually found out a data sheet? I though these were some proprietary chips and did not even try!

        Now, I can increase the needle response speed to be same as those found in modern bikes! (We need to decrease C4)


        About you problem, go to page 8 of the datasheet. Now, see the 1st formula. In 2 stroke max frequency is doubled. So, acc to formula Rt should be half of original value.

        That is it. If it does not work properly, Ccp may need to be decreased by some value. (See formula 2) Then, we need to set Rt once again using the same 1st formula.

        Try it out and see. And also please note down the values - Rt, R3, R4, C4, Ccp. And share them with me!

        Edit: @Chinmay - Black/Yellow is GND, Blue is IGN! I am positive!

        And that 100k preset is the resistor Rt
        Last edited by abhijeet080808; 12-13-2009, 08:36 PM.
        Your biking tells a lot about the person you are!

        Comment

        • #19
          Originally posted by abhijeet080808 View Post
          please note down the values - Rt, R3, R4, C4, Ccp. And share them with me!
          I know the working principal of most electronic components and can also identify them. (Please confirm the Value of resistance quoted by me)

          I got the idea of this Datasheet thing from DIY tacho for a car, using a bike's tacho - Team-BHP [If some one is interested ?]
          But I expect that I will tell to you guys some kind of voltage generated by 2 Stroke CDI
          and you will give me the appropriate value of the components to be changed in order
          to get the required result.
          Thanks.


          ---------------------------------------------
          A bird in the bush is worth 2 in hand cause
          Pleasure lies in pursuit not in possession
          But beginners like me should remember the rule of KISS :
          A Bird in the Bush is Worth, 2 in the Hand, cause
          Pleasure lies in Pursuit, not in Possession

          Comment

          • #20
            I would not know the actual values as I haven't opened up mine. As I have said, you need to set the preset resistor to half its original value. Find out to how much resistance the 220k is actually set at using a multimeter. Now, you need to set it at half that value.

            I hope you got what I meant. Let me know you results.
            Your biking tells a lot about the person you are!

            Comment

            • #21
              Find out to how much resistance the 220k is actually set at using a multimeter. Now, you need to set it at half that value
              .
              and
              I had given you some tips on the other website. Tried them?
              Yes I tried them yesterday. The Pot was set to 148.5 and fine tuned it to 74.3 but nothing. Then tried rotating the pot for other values but again a big no.
              What now ?

              With regards

              Zmint
              A Bird in the Bush is Worth, 2 in the Hand, cause
              Pleasure lies in Pursuit, not in Possession

              Comment

              • #22
                ^^What I said was for 4 stroke to 2 stroke conversion. I thought the tacho is in working condition, no?

                First get a working tacho. Then we will see!

                Originally posted by zmint View Post
                You was right the tacho was the culprit.
                I caught hold of another one & it worked on my HH Super Splendor & M800

                Now how do I make it work for a NV because it is a 2 stroke engine.
                Your biking tells a lot about the person you are!

                Comment

                • #23
                  Originally posted by abhijeet080808 View Post
                  ^^What I said was for 4 stroke to 2 stroke conversion. I thought the tacho is in working condition, no?
                  First get a working tacho. Then we will see!
                  Abhijeet Jee I think there is some misunderstanding. I alreday told you that I have a working tacho (Remember, Tacho 'B' is very much working on my HH). It this Tacho I am talking about now.(convert it for a 2 stroke engine)

                  One thing more brother. I think I will be fooling around you, through this wonderful forum for quite some time, although I read all my replies, more than once before posting, in order to see that I am not offending anyone. Yet if at any point of time you find be irritating or geeting to your nervs, please don't hesitate to show me the door. (I don't think you would mind, for me, tring to get help somewher else also.

                  With regards
                  Zmint
                  A Bird in the Bush is Worth, 2 in the Hand, cause
                  Pleasure lies in Pursuit, not in Possession

                  Comment

                  • #24
                    Originally posted by zmint View Post
                    Abhijeet Jee I think there is some misunderstanding. I alreday told you that I have a working tacho (Remember, Tacho 'B' is very much working on my HH). It this Tacho I am talking about now.(convert it for a 2 stroke engine)

                    One thing more brother. I think I will be fooling around you, through this wonderful forum for quite some time, although I read all my replies, more than once before posting, in order to see that I am not offending anyone. Yet if at any point of time you find be irritating or geeting to your nervs, please don't hesitate to show me the door. (I don't think you would mind, for me, tring to get help somewher else also.

                    With regards
                    Zmint
                    Ok.. now that you have clarified, one more thing, what happens when you conect the tacho? It works correctly on your splendour, but not on your Vespa right? Do you see any o/p in case of Vespa? If you get o/p, but it is not the correct o/p (I mean wrong rpm readings) then this mod will work.

                    If you get nothing, it could be another case. This tacho works only with CDI ignitions. Is Vespa's ignition CDI? I heard these scooters use magneto ignition. You can research on this further and see.

                    As for your questions, I am happy to help. Misunderstandings do happen on online forums, just keep your reply clear and concise as far as possible. As for seeking help somewhere else, no I don't mind. Just share your solution here too!
                    Your biking tells a lot about the person you are!

                    Comment

                    • #25
                      Originally posted by abhijeet080808 View Post
                      Do you see any o/p in case of Vespa?
                      No output. The needlel is emotionless . It does't know, that someone is trying to see me dancing (giving a good 2 stroke pulse)

                      This tacho works only with CDI ignitions. Is Vespa's ignition CDI?
                      Offcourse it is I am dead sure. I have the detailed wiring diagram (both b/w and in colour)

                      If you get nothing, it could be another case.
                      Now what can this another case be
                      A Bird in the Bush is Worth, 2 in the Hand, cause
                      Pleasure lies in Pursuit, not in Possession

                      Comment

                      • #26
                        Well, if it is really a CDI ignition, and the tacho is working fine, and even the connections are proper, I really don't know why it does not work!

                        How about sharing the wiring diagram here? Maybe we can verify the CDI and also for curiosity's sake!
                        Your biking tells a lot about the person you are!

                        Comment

                        • #27
                          Originally posted by abhijeet080808 View Post
                          How about sharing the wiring diagram here? Maybe we can verify the CDI
                          If you take a look at the first page of this thread you can see the wiring diagram.
                          http://www.xbhp.com/talkies/attachme...ng-diagram.jpg &
                          Page not found - xBhp.com
                          http://www.xbhp.com/talkies/attachments/help-me/15338d1257571828-connecting-tachometer-carb-tuning-manual-diagram-part-2-per-.jpg

                          for curiosity's sake!
                          And, to fuel your curiosity, here the low resolution colored version ..
                          A Bird in the Bush is Worth, 2 in the Hand, cause
                          Pleasure lies in Pursuit, not in Possession

                          Comment

                          • #28
                            ^^ Dunno how I missed them!

                            Only one possibility then, this CDI works at a lower voltage compared to Pulsars. If you have access to a CRO you can verify. Else, check out the resisitor that must be connected from blue wire (CDI input) to the input pin at the IC. You can decrease that resistor's value and see. ( I think a resistor is there! You can see what sort of ckt is there!)

                            Also, please verify that the tacho hasn't conked off!
                            Your biking tells a lot about the person you are!

                            Comment

                            • #29
                              A Bird in the Bush is Worth, 2 in the Hand, cause
                              Pleasure lies in Pursuit, not in Possession

                              Comment

                              • #30
                                The correct setting is within that range. The exact setting depend on how you want to tune - for power or for economy. You can verify the pick-up/mileage and tune accordingly.

                                Originally posted by zmint View Post
                                Also while inspecting the Spark plug. I have a bit of doubt. When we stop the bike it is mostly running at idle. Will inspecting the Spark plug after it has run on idle for sometime. give the true picture ? I think switching off the engine instantly, when its running in its economy zone and then inspecting the spark plug, will give a better idea about the combustion Or am I, unnecessarily taking it a bit more seriously.
                                To read the spark plug, you run the engine at a specific rpm, say 3k rpm, for about 10 minutes and shut down the engine quickly from that rpm only. Now, read the plugs. This will tell you how the mixture is at that particular engine rpm only.

                                So, running at idle will give you an idea about the mixture at idle only.
                                Your biking tells a lot about the person you are!

                                Comment

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