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DT125R FORUM

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  4. Crankshaft replacement!

Crankshaft replacement!

Scheduled Pinned Locked Moved Engine
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  • M Offline
    M Offline
    MDN91
    wrote on last edited by
    #1

    Hi!
    Have anyone replaced their crankshaft by themself? I am a car mechanic, and have little experience with these types of engines. I can't seem to find a guide with pictures on the web yet, so if anyone know of one, please let me know. A have the Haynes Workshop Manual, and it's not very helpful since my english isn't very good (I NEED PICTURES :D)
    Hope you can help me.
    Kind regards,
    Morten, Denmark

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    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #2

      Crankshaft replacement is a piece of cake.

      Split the crankcase. Very easy

      Always Originate, Never Pirate!

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      • CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #3

        http://i1152.photobucket.com/albums/p488/calum122/DT125/DT125 Project Thread/GearboxRememberence4_zps841aac41.jpg

        http://i1152.photobucket.com/albums/p488/calum122/DT125/DT125 Project Thread/GearboxRememberence13_zpsc5fd83cc.jpg

        http://i1152.photobucket.com/albums/p488/calum122/DT125/DT125 Project Thread/b164b9c9-9245-43f0-aeee-5b0507b4d553_zps67ac9c25.jpg

        http://i1152.photobucket.com/albums/p488/calum122/IMG_1795_zps351dbfe7.jpg

        http://i1152.photobucket.com/albums/p488/calum122/DT125/DT125 Project Thread/B0953FE5-E575-4561-BFC6-770330F8FA77_zpsrn3uq8j1.jpg

        It's all documented in my build thread mate.

        Always Originate, Never Pirate!

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        • CalumC Offline
          CalumC Offline
          Calum
          wrote on last edited by
          #4

          It will need to be pressed out the other side.

          Always Originate, Never Pirate!

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          • M Offline
            M Offline
            MDN91
            wrote on last edited by
            #5

            I see - i'm just a bit worried about getting into the gearbox parts and mess something up, when I have to split the cases. But I guess i'll give it a go 🙂 Thanks for the pics! By the way, i'm considering buying a complete new aftermarket crankshaft, called "Jasil" from ebay, any experience with these?

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            • CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #6

              The standard cranks are good for nuff power mate. I've forged the connecting rod and that's it. I don't see what there is to gain from a modified crank?

              Lightened flywheel perhaps. Ut a Zeeltronic Ignition system is a must. And then a decent underslung exhaust system with bigger carb and ported and polished head and barrel.

              It's all in my build thread. There isn't a Lot I haven't done.

              The gearbox mate don't worry about. It's a doddle and if you cable tie it like I have then you cannot go far wrong. Cable tie it all together before removing it and plave it back in cable tied.

              Mate you're a mechanic. I work in IT and haf no prior knowledge of mechanics before starting the build. It's a piece of cake.

              Always Originate, Never Pirate!

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              • M Offline
                M Offline
                MDN91
                wrote on last edited by
                #7

                It's not about power - I don't know anyone who can replace a connecting rod near of where I live, so that's the only reason i'm looking to buy a complete crank 🙂 People who does this are not very common in Denmark, even my local Yamaha dealer can't do it..
                But thanks for the input, it's just that i've never splitted this type, but i'll give it a go - thanks! 🙂

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                • CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by
                  #8

                  Aww mate what a waste.

                  Pjme mate. You can send the crank off to be rebuilt mate. Honestly don't throw your money away.

                  Rebuilding yhe crank is a specialist Job. Even if you have to send it away to be rebult yhere are loads of companies that do crank rebuilds. Even in Denmark

                  Always Originate, Never Pirate!

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                  • M Offline
                    M Offline
                    MDN91
                    wrote on last edited by
                    #9

                    I guess i'll look into it in the upcoming week, no of my local dealers could help my though, but I guess I could send it somewhere, as you propose. I am going to buy the parts from PJME, can you explan to me what "TZ Style Big End Bearing" means, and is it the way to go?

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                    • CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by Calum
                      #10

                      Yamaha do a ruthless two stroke race bred machine called the TZ. The TZ is a full Grand Prix bike. So presumably it runs some sketchy kind of little end bearing.

                      http://pages.ebay.com/motors/link/?nav=item.view&id=201394504785&alt=web

                      That's the rods I use. Very high quality. But PJME recommend Long rods for generic builds. Mines supposively tuned.

                      Always Originate, Never Pirate!

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