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DT125R FORUM

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  4. 2 head gaskets in two weeks

2 head gaskets in two weeks

Scheduled Pinned Locked Moved Engine
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  • CalumC Offline
    CalumC Offline
    Calum
    wrote on last edited by
    #10

    Powervalve cap? Wtf that is bolted on.

    Always Originate, Never Pirate!

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    0
    • britshgigoloB Offline
      britshgigoloB Offline
      britshgigolo
      wrote on last edited by
      #11

      @Calum yes I know striped the threads don't know if they were doggy to start with so re tapped to next size up and now I know they good just thought I would mention incase it meant something

      CalumC 1 Reply Last reply
      1
      • britshgigoloB britshgigolo

        @Calum yes I know striped the threads don't know if they were doggy to start with so re tapped to next size up and now I know they good just thought I would mention incase it meant something

        CalumC Offline
        CalumC Offline
        Calum
        wrote on last edited by
        #12

        @britshgigolo Yeah well there is going to be massive pressure there bud, you will be massively down on power as well!

        This would have nothing to do with the head gasket though mate. This has to do with the fact two strokes are designed to create a pressure wave to lost fuel and air back into the combustion chamber.

        Always Originate, Never Pirate!

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        • A Offline
          A Offline
          andrewj1680
          wrote on last edited by
          #13

          Mick did my cylinder and head the other week and didn't skim any of the faces he ported it and did the squish but am guessing he didn't feel the need to skim them I cleaned them up torqued it down with genuine gaskets and tbf the bike hasn't missed a beat but then there was nothing wrong with it before I stripped it for Mick and the bikes done less than 5000 miles

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          • britshgigoloB Offline
            britshgigoloB Offline
            britshgigolo
            wrote on last edited by
            #14

            yer when he did mine he skimmed the head heavly to get it right and told me to use two spark plug washers/gaskets to be on the safe side to stop the piston hitting the head wish i had sent the cylinder to him now but the idea was to get it done quick as was a spare top end so i could send my original off to him for him to play with and work some magic on but as have had problems im still waiting to get it running right before i send it off have ordered a new gasket and will skim both head and cylinder again and see what the out come is as no rush as have put the original back in for now as use for work eveyday

            A 1 Reply Last reply
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            • britshgigoloB britshgigolo

              yer when he did mine he skimmed the head heavly to get it right and told me to use two spark plug washers/gaskets to be on the safe side to stop the piston hitting the head wish i had sent the cylinder to him now but the idea was to get it done quick as was a spare top end so i could send my original off to him for him to play with and work some magic on but as have had problems im still waiting to get it running right before i send it off have ordered a new gasket and will skim both head and cylinder again and see what the out come is as no rush as have put the original back in for now as use for work eveyday

              A Offline
              A Offline
              andrewj1680
              wrote on last edited by
              #15

              @britshgigolo I had mine back within a week bud definitely worth having down it responds better on the throttle at whatever rpm where as it really felt lazy before

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              • britshgigoloB Offline
                britshgigoloB Offline
                britshgigolo
                wrote on last edited by
                #16

                thanks for the info and yer will be getting it done as soon as the other runs fine there no point with the spare as its on max limit now so will be getting it resleaved then will send that off to as always good to keep spare on the shelf as never know

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                • britshgigoloB Offline
                  britshgigoloB Offline
                  britshgigolo
                  wrote on last edited by
                  #17

                  Well think I found the problem the piston was catching the head gasket it has been bored to its limit so should of checked really but hope now it will be all ok give the bore and head a light skim to make sure it had not warped but all seems ok so fingers crossed this time will go ok when I get time to put it back in

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                  • CalumC Offline
                    CalumC Offline
                    Calum
                    wrote on last edited by Calum
                    #18

                    If the piston has been bored to it's limit then the powervalve is going to need modifying.

                    If you don't then I guarantee that the engine is going to seize again!

                    Always Originate, Never Pirate!

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                    • britshgigoloB Offline
                      britshgigoloB Offline
                      britshgigolo
                      wrote on last edited by
                      #19

                      i had already done the power valve before and that had no signs of problems when i took it apart just the head gasket and its where you can see it has blown across from the cylinder to the water jacket so hopfully this time it will all be ok

                      CalumC 1 Reply Last reply
                      0
                      • britshgigoloB britshgigolo

                        i had already done the power valve before and that had no signs of problems when i took it apart just the head gasket and its where you can see it has blown across from the cylinder to the water jacket so hopfully this time it will all be ok

                        CalumC Offline
                        CalumC Offline
                        Calum
                        wrote on last edited by
                        #20

                        @britshgigolo You may find a copper head gasket will be your ticket, if modifying the gasket proves too difficult.

                        I believe you still need sealant on copper gaskets, although don't quote me on that.

                        Just be wary of the powervalve is all.

                        Always Originate, Never Pirate!

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                        0
                        • britshgigoloB Offline
                          britshgigoloB Offline
                          britshgigolo
                          wrote on last edited by
                          #21

                          was told to use this with copper gasket Permatex Copper Spray-A-Gasket Hi-Temp Sealant they said give the gasket two coats before fitting my self i dont know anybody that has used one personly so can only try

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                          • MightymanM Offline
                            MightymanM Offline
                            Mightyman
                            wrote on last edited by
                            #22

                            Just confirming.. you aren't supposed to use sealant with genuine head gaskets are you?!

                            TDR 125 - 2001

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                            • britshgigoloB Offline
                              britshgigoloB Offline
                              britshgigolo
                              wrote on last edited by
                              #23

                              yes i know that was talking about the copper head gasket

                              MightymanM 1 Reply Last reply
                              0
                              • britshgigoloB britshgigolo

                                yes i know that was talking about the copper head gasket

                                MightymanM Offline
                                MightymanM Offline
                                Mightyman
                                wrote on last edited by
                                #24

                                @britshgigolo ah okay, thought I'de been doing it wrong this whole time for a second there!

                                TDR 125 - 2001

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