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DT125R FORUM

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  4. The Helios Project (Aprilia RS 125 Rotax 122 Biaggi Race Replica)

The Helios Project (Aprilia RS 125 Rotax 122 Biaggi Race Replica)

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  • CalumC Calum

    Bike fired up into life with little to no dramas after 6 months of storage.

    https://youtu.be/a5Nc9Fd5jvM

    Since I last rode it, I removed the RAVE solenoid in favour for the Italkit adjustable pneumatic valve.

    Was excited about taking it for a spin...

    I made it to the end of my drive and tapped the rear brake... Sezied solid. Locked the wheel up and it was a effort just to get it back into the garage!

    The master cylinder had seized. So after checking the rear caliper for damage, I set about sorting the master cylinder out. Dismantled it fully, it it with a blow torch and that seems to have freed the piston!

    Just come back from a quick blip up the road! What a machine!!!

    I absolutely love the power delivery of a smoker. Amazing.

    NINJAN Offline
    NINJAN Offline
    NINJA
    wrote on last edited by
    #298

    @calum Sounds wicked bro!!! 👍

    SEDUCED BY THE DARK SIDE!!!

    CalumC 1 Reply Last reply
    1
    • NINJAN NINJA

      @calum Sounds wicked bro!!! 👍

      CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #299

      @ninja goes well. I need to get a dyno session arranged and see what it makes.

      Always Originate, Never Pirate!

      NINJAN declanD 2 Replies Last reply
      0
      • CalumC Calum

        @ninja goes well. I need to get a dyno session arranged and see what it makes.

        NINJAN Offline
        NINJAN Offline
        NINJA
        wrote on last edited by
        #300

        @calum That would be very interesting to see for-sure. 😀

        SEDUCED BY THE DARK SIDE!!!

        1 Reply Last reply
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        • CalumC Calum

          @ninja goes well. I need to get a dyno session arranged and see what it makes.

          declanD Offline
          declanD Offline
          declan
          wrote on last edited by
          #301

          @calum sweet bike

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          • Z Offline
            Z Offline
            zegwed
            wrote on last edited by
            #302

            Good afternoon. Perfectly refined. A huge job that is exciting. I wanted to find out the spec sheet on the hydraulic clutch (if possible for all modifications), for what reasons was the release cylinder selected? I can't find on the Internet which one you put.

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            • CalumC Offline
              CalumC Offline
              Calum
              wrote on last edited by
              #303

              Hi @zegwed Spec sheet? I just made it up? Lambretta clutch spring, Ducati 996 Master/Slave cylinder and then machine up a plate to hold it together.

              Something like this: 222522806529

              It works really well, especially as I'm running tough springs etc.

              Always Originate, Never Pirate!

              1 Reply Last reply
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              • Z Offline
                Z Offline
                zegwed
                wrote on last edited by
                #304

                I thought so from ducati))))) did you make a retaining plate? And tell me more clutch handles and brakes of which company? I'll try to implement it))))

                1 Reply Last reply
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                • CalumC Offline
                  CalumC Offline
                  Calum
                  wrote on last edited by Calum
                  #305

                  ^^^Ducati Master & Slave cylinders.

                  Yes I machined up the plate on the lathe.

                  334637519334

                  Always Originate, Never Pirate!

                  1 Reply Last reply
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                  • Z Offline
                    Z Offline
                    zegwed
                    wrote on last edited by
                    #306

                    Do you remember the dimensions??

                    1 Reply Last reply
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                    • CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by
                      #307

                      No....
                      alt text

                      alt text

                      alt text

                      Just made it up.

                      Always Originate, Never Pirate!

                      1 Reply Last reply
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                      • CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #308

                        Always wanted these heel plates but sadly they were no longer being made when I was building mine.

                        Happy then, when I saw TYGA were manufacturing these. Again the quality is as you'd expect from TYGA... Utterly flawless.

                        Pleased to actually have the period correct heel plates for my bike in stunning carbon fibre. Thanks TYGA!

                        P.S. Make more carbon for my bike 😛

                        Always Originate, Never Pirate!

                        1 Reply Last reply
                        0
                        • CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #309

                          First time I have ridden this in two years...man what a bike. Everything on this bike is just so tight. Rapid little bike this, mind blowing you used to be able to buy these at 17!

                          Always Originate, Never Pirate!

                          1 Reply Last reply
                          2
                          • CalumC Offline
                            CalumC Offline
                            Calum
                            wrote on last edited by
                            #310

                            I don't often go out on this bike, but today was a momentous occasion.

                            My brother finally finished his Yamito 350 project after picking it up in 2021 in an unfinished state, my brother undertook a huge job of things today and is now a happy chap with his wheelie monster Cagiva Mito with an RD421 conversion kit.

                            Dyno'd at ~75whp and 34lbft torque, the thing nearly flipped coming off the lights onto a dual carriageway.

                            Handles like a 125 goes like a 600+!

                            Always Originate, Never Pirate!

                            HOTSHOT IIIH 1 Reply Last reply
                            2
                            • CalumC Calum

                              I don't often go out on this bike, but today was a momentous occasion.

                              My brother finally finished his Yamito 350 project after picking it up in 2021 in an unfinished state, my brother undertook a huge job of things today and is now a happy chap with his wheelie monster Cagiva Mito with an RD421 conversion kit.

                              Dyno'd at ~75whp and 34lbft torque, the thing nearly flipped coming off the lights onto a dual carriageway.

                              Handles like a 125 goes like a 600+!

                              HOTSHOT IIIH Offline
                              HOTSHOT IIIH Offline
                              HOTSHOT III
                              wrote on last edited by HOTSHOT III
                              #311

                              @Calum Love seeing these Mitos with RD engines fitted, it's kind of how the 350LC/YPVS would look if Yamaha released a modern version today.

                              I think the 999Lazer YouTube channel would be up for featuring this bike, it's predominantly a MX channel but they've been branching out lately to anything two-stroke, recently they did a comparison between the Langen Two Stroke and a 30-year-old V-Twin TZR250 and they've done some other road-going stuff:

                              https://www.youtube.com/watch?v=v6rGpiTzYGQ&t=2s

                              Helios looking good as well!!

                              1 Reply Last reply
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                              • CalumC Offline
                                CalumC Offline
                                Calum
                                wrote on last edited by
                                #312

                                Always Originate, Never Pirate!

                                1 Reply Last reply
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