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DT125R FORUM

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Best piston

Scheduled Pinned Locked Moved Top End
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  • aidan1996A aidan1996

    @vtrn_raptor Makita all the way

    DartyD Offline
    DartyD Offline
    Darty
    wrote on last edited by
    #6

    @aidan1996 lol

    Keep it real

    1 Reply Last reply
    0
    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #7

      Personally I would stick with Wossner Wiesco since they are forged metals. But I ran Mitaka for years and they were just as good. Aa said you get what you pay for

      Always Originate, Never Pirate!

      1 Reply Last reply
      2
      • aidan1996A aidan1996

        @vtrn_raptor Makita all the way

        BurridgeB Offline
        BurridgeB Offline
        Burridge
        wrote on last edited by
        #8

        @aidan1996 said in Best piston:

        @vtrn_raptor Makita all the way
        Power tools and Pistons. Yas.

        1 Reply Last reply
        0
        • MightymanM Mightyman

          Think you mean Mitaka @Biker_123 !

          I would definitely recommend this. http://www.ebay.co.uk/itm/271007694130?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

          Purchased the listing a couple of weeks ago when I found out it was the place Norfe used to use back when he was offering engine rebuild services on the old forum.

          Remove everything from your barrel, stick it in the post and you will receive a re-bored barrel with the correctly sized Mitaka piston + gaskets in just a few days. Excellent value for money.

          BurridgeB Offline
          BurridgeB Offline
          Burridge
          wrote on last edited by
          #9

          @MIGHTYMAN said in Best piston:

          Think you mean Mitaka @Biker_123 !

          I would definitely recommend this. http://www.ebay.co.uk/itm/271007694130?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

          Purchased the listing a couple of weeks ago when I found out it was the place Norfe used to use back when he was offering engine rebuild services on the old forum.

          Remove everything from your barrel, stick it in the post and you will receive a re-bored barrel with the correctly sized Mitaka piston + gaskets in just a few days. Excellent value for money.

          £61?! I paid more than that back when I was 16 for a rebore and crappy new piston for a SYM Jet 50!

          1 Reply Last reply
          1
          • Irongamer727I Offline
            Irongamer727I Offline
            Irongamer727
            wrote on last edited by
            #10

            Anyone heard if KHC pistons? I had one in my DT when I ran stock cylinder. I can only find it on alibaba lol.

            KHC piston, shit or shit? https://imgur.com/gallery/axdthPy

            Glynn123G 1 Reply Last reply
            0
            • Irongamer727I Irongamer727

              Anyone heard if KHC pistons? I had one in my DT when I ran stock cylinder. I can only find it on alibaba lol.

              KHC piston, shit or shit? https://imgur.com/gallery/axdthPy

              Glynn123G Offline
              Glynn123G Offline
              Glynn123
              wrote on last edited by
              #11

              @irongamer727 oho don't get my started on K.H.C Pistons, one big mistake was made when putting one in my gas gas, piston rings didn't actually fit the grooves, like at all, and this was a matching set. Rings are made of what must literally be the most brittle type of chinesium. Pretty sure the skirt snapped on the next owner too as he sold it shortly after showing cases of an extremely damaged nikasil bore. Since then I will never buy anything other than a wossner or wiseco, what a mistake that £20 piston was...

              Irongamer727I 1 Reply Last reply
              0
              • Glynn123G Glynn123

                @irongamer727 oho don't get my started on K.H.C Pistons, one big mistake was made when putting one in my gas gas, piston rings didn't actually fit the grooves, like at all, and this was a matching set. Rings are made of what must literally be the most brittle type of chinesium. Pretty sure the skirt snapped on the next owner too as he sold it shortly after showing cases of an extremely damaged nikasil bore. Since then I will never buy anything other than a wossner or wiseco, what a mistake that £20 piston was...

                Irongamer727I Offline
                Irongamer727I Offline
                Irongamer727
                wrote on last edited by
                #12

                @glynn123
                https://imgur.com/gallery/Ovdhjwg

                Here's the state of my old cylinder. Not sure it was because of the piston but this doesn't look very nice at all. There was this horrible knocking/rattling from the cylinder for those who remember. That's why I decided for the Athena really.

                6000km piston https://imgur.com/gallery/Koz7v5j

                Here's the piston, about 6000km on it.
                Looks pretty okay I guess. I've removed some carbon on the top to look for signs of detonation and such. The carbon build-up isn't actually that bad.

                1 Reply Last reply
                0
                • Irongamer727I Offline
                  Irongamer727I Offline
                  Irongamer727
                  wrote on last edited by
                  #13

                  On this piston, I can't see any signs of piston slap.

                  CalumC 1 Reply Last reply
                  0
                  • Irongamer727I Offline
                    Irongamer727I Offline
                    Irongamer727
                    wrote on last edited by
                    #14

                    https://m.alibaba.com/product/60701710970/Motorcycle-Pistons-Rings-For-YAMAHA-TZR125.html?spm=a2706.amp_showroom

                    Think I found it, I mean if you buy this shit, you shouldn't be legally allowed to own a motorized vehicle...
                    I can only imagine what @Calum must think😉

                    1 Reply Last reply
                    1
                    • Irongamer727I Irongamer727

                      On this piston, I can't see any signs of piston slap.

                      CalumC Offline
                      CalumC Offline
                      Calum
                      wrote on last edited by Calum
                      #15

                      @irongamer727 That new Forged Vertex one I've just got is going to slap like a BIATCH!

                      Massive piston to wall clearances.

                      It's hard to tell from the finish how decent a piston is, to really appreciate it you have to understand the properties of the alloy they used. This gets above my comprehension level and I leave that to the professionals.

                      But in my book, "Tuning For Speed", Irwin explains what type of alloy is best used for each application. And more interestingly, the best places to get such metals. Namely Birmingham England (about 40 minutes drive from me), whilst referencing the company. Bare in mind this chap is from Australia, so the fact he's referencing something from across the globe is pretty impressive.

                      Alas, our manufacturing has since long gone. But a good book never the less.

                      Always Originate, Never Pirate!

                      Irongamer727I declanD 2 Replies Last reply
                      0
                      • CalumC Calum

                        @irongamer727 That new Forged Vertex one I've just got is going to slap like a BIATCH!

                        Massive piston to wall clearances.

                        It's hard to tell from the finish how decent a piston is, to really appreciate it you have to understand the properties of the alloy they used. This gets above my comprehension level and I leave that to the professionals.

                        But in my book, "Tuning For Speed", Irwin explains what type of alloy is best used for each application. And more interestingly, the best places to get such metals. Namely Birmingham England (about 40 minutes drive from me), whilst referencing the company. Bare in mind this chap is from Australia, so the fact he's referencing something from across the globe is pretty impressive.

                        Alas, our manufacturing has since long gone. But a good book never the less.

                        Irongamer727I Offline
                        Irongamer727I Offline
                        Irongamer727
                        wrote on last edited by
                        #16

                        @calum why would you want big clearances? I measured the bore and the piston and the diameter was nearly the same. To tight is not good of course but I can't imagine why a performance engine would want big clearances.

                        CalumC 1 Reply Last reply
                        0
                        • Irongamer727I Irongamer727

                          @calum why would you want big clearances? I measured the bore and the piston and the diameter was nearly the same. To tight is not good of course but I can't imagine why a performance engine would want big clearances.

                          CalumC Offline
                          CalumC Offline
                          Calum
                          wrote on last edited by
                          #17

                          @irongamer727 It's the thermal co-efficients of forged components which is why there are big piston to wall clearances. Forged components will expand much greater than weaker cast components. Which means the gap will close and it will be fine, but this makes it absolutely paramount that you wait for the engine to get up to operating temperature.

                          Same thing as my Starlet.

                          Always Originate, Never Pirate!

                          Irongamer727I 1 Reply Last reply
                          0
                          • CalumC Calum

                            @irongamer727 It's the thermal co-efficients of forged components which is why there are big piston to wall clearances. Forged components will expand much greater than weaker cast components. Which means the gap will close and it will be fine, but this makes it absolutely paramount that you wait for the engine to get up to operating temperature.

                            Same thing as my Starlet.

                            Irongamer727I Offline
                            Irongamer727I Offline
                            Irongamer727
                            wrote on last edited by
                            #18

                            @calum oh now that you say it I remember.
                            I mean I would not be surprised if my previous piston has expanded a bit too much in the cylinder.

                            As you can see on the link there is like a mirror finish in the exhaust and inlet side. I don't have a clue where the ticking/rattling sound came from though.

                            CalumC 1 Reply Last reply
                            0
                            • Glynn123G Offline
                              Glynn123G Offline
                              Glynn123
                              wrote on last edited by
                              #19

                              My wossner was absolutely silent when I first rebuild the Dt, had a barrel bored to match the piston at the recommended tolerances from wossner. Hundred miles on it started getting rattley, it's now pretty piston slappy at the top end but checked 1000 miles on when headgasket went and piston and ring tolerances were perfect haha, makes great power and starts good so I'm not worried, never heard a good running two stroke any better really, it's when they're silent you need to worry haha.

                              1 Reply Last reply
                              0
                              • CalumC Calum

                                @irongamer727 That new Forged Vertex one I've just got is going to slap like a BIATCH!

                                Massive piston to wall clearances.

                                It's hard to tell from the finish how decent a piston is, to really appreciate it you have to understand the properties of the alloy they used. This gets above my comprehension level and I leave that to the professionals.

                                But in my book, "Tuning For Speed", Irwin explains what type of alloy is best used for each application. And more interestingly, the best places to get such metals. Namely Birmingham England (about 40 minutes drive from me), whilst referencing the company. Bare in mind this chap is from Australia, so the fact he's referencing something from across the globe is pretty impressive.

                                Alas, our manufacturing has since long gone. But a good book never the less.

                                declanD Offline
                                declanD Offline
                                declan
                                wrote on last edited by
                                #20

                                @calum only 21 mins from me 😀

                                1 Reply Last reply
                                0
                                • Irongamer727I Irongamer727

                                  @calum oh now that you say it I remember.
                                  I mean I would not be surprised if my previous piston has expanded a bit too much in the cylinder.

                                  As you can see on the link there is like a mirror finish in the exhaust and inlet side. I don't have a clue where the ticking/rattling sound came from though.

                                  CalumC Offline
                                  CalumC Offline
                                  Calum
                                  wrote on last edited by
                                  #21

                                  @irongamer727 Sounds more like glazed bore which is due to incorrect run in procedure.

                                  I've switched from Wossner now, after PJME have advised they've started manufacturing their stuff in China.

                                  Now China has some of the worlds foremost engineering plants in the world. It's their QC that lets them down.

                                  I've now switched.

                                  Always Originate, Never Pirate!

                                  Irongamer727I 1 Reply Last reply
                                  0
                                  • CalumC Calum

                                    @irongamer727 Sounds more like glazed bore which is due to incorrect run in procedure.

                                    I've switched from Wossner now, after PJME have advised they've started manufacturing their stuff in China.

                                    Now China has some of the worlds foremost engineering plants in the world. It's their QC that lets them down.

                                    I've now switched.

                                    Irongamer727I Offline
                                    Irongamer727I Offline
                                    Irongamer727
                                    wrote on last edited by
                                    #22

                                    @calum have a look at the link😛

                                    1 Reply Last reply
                                    0
                                    • CalumC Offline
                                      CalumC Offline
                                      Calum
                                      wrote on last edited by
                                      #23

                                      Definiteoy got a fueling issue there.

                                      Always Originate, Never Pirate!

                                      Irongamer727I 1 Reply Last reply
                                      0
                                      • CalumC Calum

                                        Definiteoy got a fueling issue there.

                                        Irongamer727I Offline
                                        Irongamer727I Offline
                                        Irongamer727
                                        wrote on last edited by
                                        #24

                                        @calum is that cylinder scrap? The piston was 58.4 mm. So I guess it is soon no point boring that cylinder? Not that I will use it again.

                                        CalumC 1 Reply Last reply
                                        0
                                        • Irongamer727I Irongamer727

                                          @calum is that cylinder scrap? The piston was 58.4 mm. So I guess it is soon no point boring that cylinder? Not that I will use it again.

                                          CalumC Offline
                                          CalumC Offline
                                          Calum
                                          wrote on last edited by
                                          #25

                                          @irongamer727 You can go overbore. Really need to modify the valve when you do. And you can have a new liner put in.

                                          Always Originate, Never Pirate!

                                          1 Reply Last reply
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