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Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

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  • #1

    Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

    Hi All,

    I am starting up this new thread as after searching at various forums and here I still have not got concrete answer of it.

    Can the crankshaft be changed to a heavier crankshaft in the Royal Enfield UCE engine Bullets, though as far as I know the UCE Bullet crank weight is not all time low and not too light either but still the question remains.

    If yes then please provide a detail explanation like

    1. What is the technicality and complexity involved
    2. What would be the advantages and disadvantages etc
    3. What else needs to be changed if putting a heavier crank

    And if not then why?

    Experts please pour in your thoughts. The best is if anyone already has got it done then please share the details.

    Moderator: I have to start a new thread as no concrete input was found in any other threads
    Tags: bullet, bullet 350cc, bullet classic, crank, heavy crank, royal enfield, royal enfield uce bullet, thump, uce
  • #2
    Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

    Topic Approved
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    • #3
      Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

      Originally posted by The Monk View Post
      Topic Approved
      Thanks for approving it Monk

      Comment

      • #4
        Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

        What's the benefit of putting a heavier crank shaft? These days engineers are trying to put lightweight materials, right? So, why would you want to put a heavier crankshaft?
        "HASTA LA VICTORIA, SIEMPRE !" - Chesigpic


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        • #5
          Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

          Originally posted by rx100.7050 View Post
          What's the benefit of putting a heavier crank shaft? These days engineers are trying to put lightweight materials, right? So, why would you want to put a heavier crankshaft?
          Well call it whatever you want but I have my own fascination :

          -- Heavier crank means the Bullet can easily chug along at the speed of 20-25 on 4th gear so the need to downshift would be less, I know I would loose on pickup and speed and may be little bit on mileage as well
          -- As far as I know and researched, the thump would be more prominent and distinct, not continous
          -- Not bothered much about high end torque so already exceptional low end torque would become even more

          Well it might not go well with many but I have transformed from a speed freak to a relaxed rider now so the questions is not why I need the question is can I or if yes then how

          Comment

          • #6
            Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

            No real takers on this

            Comment

            • #7
              Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

              Any specific gain just by changing "only" the crankshaft?

              Some points:

              1) How much will be the weight difference?

              2) Can the heavier shaft be fitted in the existing space?

              3) Crankshaft bearings will have to be changed (if significant weight difference).

              4) Can the gearbox shaft produce enough torque to move the shaft at a constant rate?

              Cheerz!!
              The real beauty lies in throttle's twist!!

              Headlight can be replaced, Head cannot be. Wear a helmet.

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              • #8
                Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                Originally posted by gyan_recl350 View Post
                Hi All,

                I am starting up this new thread as after searching at various forums and here I still have not got concrete answer of it.

                Can the crankshaft be changed to a heavier crankshaft in the Royal Enfield UCE engine Bullets, though as far as I know the UCE Bullet crank weight is not all time low and not too light either but still the question remains.

                If yes then please provide a detail explanation like

                1. What is the technicality and complexity involved
                2. What would be the advantages and disadvantages etc
                3. What else needs to be changed if putting a heavier crank

                And if not then why?

                Experts please pour in your thoughts. The best is if anyone already has got it done then please share the details.

                Moderator: I have to start a new thread as no concrete input was found in any other threads

                which one are you referring to the 350 or the 500 , if it is 350 then you can , by using the 500 crank, in fact the present std 350 come with the 500s crank from the factory itself
                Kawasaki KB100/enduro/125 substitute parts list http://www.xbhp.com/talkies/508615-post105.html

                Comment

                • #9
                  Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                  Originally posted by devils_friend View Post
                  Any specific gain just by changing "only" the crankshaft?

                  Some points:

                  1) How much will be the weight difference?

                  2) Can the heavier shaft be fitted in the existing space?

                  3) Crankshaft bearings will have to be changed (if significant weight difference).

                  4) Can the gearbox shaft produce enough torque to move the shaft at a constant rate?

                  Cheerz!!
                  Below are the answers:

                  1. Around 3 to 3.5 kgs
                  2. Probably yes as the UCE standard model has heavier crank than all other 350 cc UCE REs, it has same crank weight as 500 Bullets (actually this is what all I want to know but instead I am answering this )
                  3. More details required as this are the things I want to know
                  4. No idea

                  ----consecutive posts auto-merged-----

                  Originally posted by kb100 View Post
                  which one are you referring to the 350 or the 500 , if it is 350 then you can , by using the 500 crank, in fact the present std 350 come with the 500s crank from the factory itself
                  Sorry forgot to mention, I am referring 350 UCE engine Bullets. Yes I am aware that standard's crank is of same weight as the 500 Bullets but nobody has provided complete details on if it can be done for other UCE 350 cc REs and if yes then complete details please

                  Comment

                  • #10
                    Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                    This thread is dying

                    Mods: Is this thread put into wrong section?

                    Comment

                    • #11
                      Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                      Originally posted by gyan_recl350 View Post
                      This thread is dying

                      Mods: Is this thread put into wrong section?
                      Yes, In this world nothing is impossible, However the efforts (time and money) is not worth against the gains you have.
                      The crank-shaft for Classic 500 IMO costs around 10-11K and the labor will be something around 3-4K.

                      The risk of work not done correctly will always be there.

                      Best of luck for the conversion.

                      Regards
                      Mandar

                      Comment

                      • #12
                        Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                        Originally posted by Mandar_C500 View Post
                        Yes, In this world nothing is impossible, However the efforts (time and money) is not worth against the gains you have.
                        The crank-shaft for Classic 500 IMO costs around 10-11K and the labor will be something around 3-4K.

                        The risk of work not done correctly will always be there.

                        Best of luck for the conversion.

                        Regards
                        Mandar
                        Agree with you but more than "can", I needed the details on "how" anyways thanks for the input.

                        Btw not going for it straight away

                        Comment

                        • #13
                          Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                          Originally posted by gyan_recl350 View Post
                          Agree with you but more than "can", I needed the details on "how" anyways thanks for the input.

                          Btw not going for it straight away
                          I have already one way of doing it in my earlier post,
                          Other way is:
                          You can add weight by attaching the metal all over the circumference to the existing crank. But this is a specialist's job. The you have to balance the weight on both sides.

                          I would still suggest please don't go for this mod.

                          Regards
                          Mandar

                          Comment

                          • #14
                            Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                            Originally posted by Mandar_C500 View Post
                            I have already one way of doing it in my earlier post,
                            Other way is:
                            You can add weight by attaching the metal all over the circumference to the existing crank. But this is a specialist's job. The you have to balance the weight on both sides.

                            I would still suggest please don't go for this mod.

                            Regards
                            Mandar
                            Hmm attaching metal all over the circumference would always invite asymmetry , but anyways looks like I am not going for it but still would like to know all the technicals involved

                            Btw thanks mandar for the inputs

                            Sent from my X10i using xBhp Connect mobile app

                            Comment

                            • #15
                              Re: Can crankshaft be changed to heavier one in the Royal Enfield UCE Bullet

                              I think this thread is all but dead

                              Sent from my X10i using xBhp Connect mobile app

                              Comment

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