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Honda Stunner Sprocket Change

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  • #1

    Honda Stunner Sprocket Change

    Hello All,

    I would like to know if I can use the Honda Unicorn's front sprocket (15 teeth) directly on my Honda Stunner (stock setup 14 teeth) ?

    According to one of the members on xbhp this can be done but I am not very sure since I read somewhere on xbhp that one has to shave off the edges of the Unicorn's sprocket to fit into the Honda Shine. Since Shine and Stunner have the same engine so I am not sure if the Unicorn's front sprocket is a direct fit on Stunner or not..

    Experts please help..
    Signals which are timed for 50 Kmph are also timed for 100 Kmph :)
    Tags: None
  • #2
    Query approved.
    (Been There Done That) x 3.25

    Comment

    • #3
      Thanks Sunil for approving the query...

      Can anyone help me out here?
      Signals which are timed for 50 Kmph are also timed for 100 Kmph :)

      Comment

      • #4
        Originally posted by cmahajan View Post
        Hello All,

        I would like to know if I can use the Honda Unicorn's front sprocket (15 teeth) directly on my Honda Stunner (stock setup 14 teeth) ?

        According to one of the members on xbhp this can be done but I am not very sure since I read somewhere on xbhp that one has to shave off the edges of the Unicorn's sprocket to fit into the Honda Shine. Since Shine and Stunner have the same engine so I am not sure if the Unicorn's front sprocket is a direct fit on Stunner or not..

        Experts please help..
        Yes what you have read is right.Instead what you can do is replace the rear sprocket with stunner FI's one.Stunner FI's rear sprocket is having one tooth less than the carb. stunner.So you will get the required taller gearing! & this wont require any special modifications

        Comment

        • #5
          Originally posted by amitmalve View Post
          Yes what you have read is right.Instead what you can do is replace the rear sprocket with stunner FI's one.Stunner FI's rear sprocket is having one tooth less than the carb. stunner.So you will get the required taller gearing! & this wont require any special modifications
          Are you sure about this man?

          There is one member on xbhp who claims to have replaced the Stunner's front sprocket with the Unicorn's front sprocket successfully himself (without the help of a mechanic and within 15 minutes)

          Also, I am not in the favor of changing the rear sprocket because it would cost a whole lot more than the front sprocket...
          Signals which are timed for 50 Kmph are also timed for 100 Kmph :)

          Comment

          • #6
            Originally posted by cmahajan View Post
            Are you sure about this man?

            There is one member on xbhp who claims to have replaced the Stunner's front sprocket with the Unicorn's front sprocket successfully himself (without the help of a mechanic and within 15 minutes)

            Also, I am not in the favor of changing the rear sprocket because it would cost a whole lot more than the front sprocket...
            I already told you to change the rear sprocket with Stunner FI's/Twister's/Dazzler's rear sprocket.

            If you replace the rear sprocket, you will not have any technical issues as this sprocket is already being used in Stunner FI by Honda. You will end up slight decrease in initial acceleration, but you will gain 10 kmph in every gear. You will also see reduction in vibrations. Also fit handle bar rubbers from Unicorn which will further reduce the vibrations.

            The rear sprocket's price is 450.
            Last edited by ravi@17bhp; 02-23-2011, 09:19 AM.
            HH Karizma (Current) || CBF Stunner PGM-FI || Honda CB Unicorn Dazzler
            Honda Aviator || Kinetic Flyte || Kinetic Blaze || HH Splendor

            Two ZMAs, 9 Days in Western Ghats

            Comment

            • #7
              Mahajan, its not a rocket science replacing sprockets. Trust me, YOU CAN DO IT too!!!

              Anyway to address your issue, here's much simpler approach. Remove the front sprocket, take it to a local garage or H.A.S.S & ask for Uni's front sprocket from the stores or from the garage, compare it side by side, mm by mm & then you can decide by yourself if it can be done.

              Even if you're unable to remove the sprocks, go to H.A.S.S & ask for both Uni's & Stunner's sprocks, compare it & see. If the store person asks as why you need, tell them your plan on mind & I'm sure he'll call a mech from the service division & you can get an ASSURED response.
              Skill is what keeps you on a Motorcycle
              Awareness + Skill is what keeps you out of harm's way
              ATGATT + Awareness + Skill means you might Live To Ride another day

              Comment

              • #8
                Originally posted by aargee View Post
                Mahajan, its not a rocket science replacing sprockets. Trust me, YOU CAN DO IT too!!!

                Anyway to address your issue, here's much simpler approach. Remove the front sprocket, take it to a local garage or H.A.S.S & ask for Uni's front sprocket from the stores or from the garage, compare it side by side, mm by mm & then you can decide by yourself if it can be done.

                Even if you're unable to remove the sprocks, go to H.A.S.S & ask for both Uni's & Stunner's sprocks, compare it & see. If the store person asks as why you need, tell them your plan on mind & I'm sure he'll call a mech from the service division & you can get an ASSURED response.
                That makes sense...

                However, I'd like you all to go through this thread and read the posts by "Honda_CBF". He claims to have replaced the front sprocket with the Unicorn's successfully.

                Honda 125 Stunner CBF - xBhp.com : The Global Indian Biking Community
                http://www.xbhp.com/talkies/motorcycle-ownership-experiences/4918-honda-125-stunner-cbf-22.html
                Share what you think about the motorcycle you own or have owned in the past.
                Signals which are timed for 50 Kmph are also timed for 100 Kmph :)

                Comment

                • #9
                  Originally posted by cmahajan View Post
                  That makes sense...
                  Will go through the link, but like Ravi & Amit suggested, you need to seriously consider replacing the rear sprocks for higher top end at the cost of acceleration. Otherwise, you may not be able to appreciate the difference of replacing the front sprocks.
                  Skill is what keeps you on a Motorcycle
                  Awareness + Skill is what keeps you out of harm's way
                  ATGATT + Awareness + Skill means you might Live To Ride another day

                  Comment

                  • #10
                    Originally posted by aargee View Post
                    Will go through the link, but like Ravi & Amit suggested, you need to seriously consider replacing the rear sprocks for higher top end at the cost of acceleration. Otherwise, you may not be able to appreciate the difference of replacing the front sprocks.
                    Well, I'm not sure if that is entirely correct.

                    Here is a little math:

                    The Stunner's stock setup is 42/14 = 3

                    If I replace the front sprocket the ratio would be 42/15 = 2.8 (6% change)

                    If I replace the rear sprocket the ratio would be 43/14 = 3.071 (2.3% change)

                    This means that the change would be more if I replace the front sprocket an not the rear one...

                    Have I got it correct?
                    Signals which are timed for 50 Kmph are also timed for 100 Kmph :)

                    Comment

                    • #11
                      ^^^ oh!!! ok...what I meant was this one...
                      Stunner FI's rear sprocket is having one tooth less than the carb
                      Go for smaller rear sprocks & bigger front sprocks combination if you want to cruise at higher speeds at less vibrations.
                      Skill is what keeps you on a Motorcycle
                      Awareness + Skill is what keeps you out of harm's way
                      ATGATT + Awareness + Skill means you might Live To Ride another day

                      Comment

                      • #12
                        Originally posted by aargee View Post
                        ^^^ oh!!! ok...what I meant was this one...


                        Go for smaller rear sprocks & bigger front sprocks combination if you want to cruise at higher speeds at less vibrations.
                        Oh yes of course...I knew that...my bad...

                        So the new equation is 41/14 = 2.92 (7.14% change)

                        So you are right. Changing the rear sprocket will make more difference but the difference from changing the front sprocket won't be much...

                        6% as compared to 7.14%

                        So I would still prefer to change the front sprocket since the difference in costs is huge (front sprocket costs less than Rs 100 and rear sprocket costs Rs 450 according to Ravi)

                        Why pay Rs 350 more for the same change?
                        Signals which are timed for 50 Kmph are also timed for 100 Kmph :)

                        Comment

                        • #13
                          Well, if I were you, I'd wait to get things done if the cost is high rather than relying too much on the cost factor. But the choice & money is yours.

                          Why pay Rs 350 more for the same change?
                          But again, without changing the front sprocks, you initial pickup with each gear will only be pathetic. You'll find a little improvement when both of them are changed together. But again, these are my experiements with Rx 15/34, 16/34 combinations & not with Stunner/Unicorn.

                          I hope you got a good idea as how to make progress on this one.
                          Skill is what keeps you on a Motorcycle
                          Awareness + Skill is what keeps you out of harm's way
                          ATGATT + Awareness + Skill means you might Live To Ride another day

                          Comment

                          • #14
                            Originally posted by aargee View Post
                            Well, if I were you, I'd wait to get things done if the cost is high rather than relying too much on the cost factor. But the choice & money is yours.

                            But again, without changing the front sprocks, you initial pickup with each gear will only be pathetic. You'll find a little improvement when both of them are changed together. But again, these are my experiements with Rx 15/34, 16/34 combinations & not with Stunner/Unicorn.

                            I hope you got a good idea as how to make progress on this one.
                            I am getting all calculations wrong..hehe...

                            These are the revised calculations.

                            Case 1 - Front Sprocket Change
                            New ratio = 42/15 = 2.8
                            Change = (3 - 2.8) / 3 * 100 = 6.66% change

                            Case 2 - Rear Sprocket Change
                            New ratio = 41/14 = 2.9285
                            Change = (3 - 2.9285) / 3 * 100 = 2.38% change

                            So it is clear that the change in gearing would be more if I change the front sprocket and not the rear sprocket...

                            So can anyone give me a good reason as to why I should prefer a rear sprocket change rather than the front?

                            Am I even doing the calculations correctly?
                            Signals which are timed for 50 Kmph are also timed for 100 Kmph :)

                            Comment

                            • #15
                              Hey guys, all stunner owner can shift to uni's front sprocket..... Its damn easy....
                              And it'll give increased speed of ~5kmph on usable rpms.
                              And one tooth drop at rear sprocket can never increase speed upto 10kmph.
                              It may give around 2kmph increase.
                              http://www.facebook.com/ateesh.kumar

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