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DT125R FORUM

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  3. Bike running fast revs

Bike running fast revs

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  • O Offline
    O Offline
    oldman
    wrote on last edited by
    #20

    Yes 0_1507742590451_20171011_182026-979x1305.jpg

    1 Reply Last reply
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    • declanD declan

      @declan should there be a gasket between the engine and the reed block spacer

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

      @declan That was literally one of the things I rattled off before hand...

      Always Originate, Never Pirate!

      declanD 1 Reply Last reply
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      • CalumC Calum

        @declan That was literally one of the things I rattled off before hand...

        declanD Offline
        declanD Offline
        declan
        wrote on last edited by
        #22

        @calum yes but my bike doesent have one @oldman is there two of those gaskets?

        CalumC 1 Reply Last reply
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        • declanD declan

          @calum yes but my bike doesent have one @oldman is there two of those gaskets?

          CalumC Online
          CalumC Online
          Calum
          wrote on last edited by Calum
          #23

          @declan No

          alt text

          Item 8 and be sure to buy either genuine or Athena.

          As said, it's common for them to go there on these bikes because people either do naff copies, use inferior parts or reuse gaskets.

          Always Originate, Never Pirate!

          declanD 1 Reply Last reply
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          • CalumC Calum

            @declan No

            alt text

            Item 8 and be sure to buy either genuine or Athena.

            As said, it's common for them to go there on these bikes because people either do naff copies, use inferior parts or reuse gaskets.

            declanD Offline
            declanD Offline
            declan
            wrote on last edited by
            #24

            @calum see I have a gasket underneath the inlet manifold is this in the wrong place then Bud?

            CalumC 1 Reply Last reply
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            • declanD declan

              @calum see I have a gasket underneath the inlet manifold is this in the wrong place then Bud?

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

              @declan The inlet is "Rubber" therefore doesn't need a gasket.

              The Engine is metal and therefore needs a gasket.

              So yes. As I said at the start, it's an airleak. It's where I suspected it to be.

              Always Originate, Never Pirate!

              declanD 1 Reply Last reply
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              • CalumC Calum

                @declan The inlet is "Rubber" therefore doesn't need a gasket.

                The Engine is metal and therefore needs a gasket.

                So yes. As I said at the start, it's an airleak. It's where I suspected it to be.

                declanD Offline
                declanD Offline
                declan
                wrote on last edited by
                #26

                @calum I’ll get the gasket switched round tomorrow and we will see how it goes thanks for you time mate

                CalumC 1 Reply Last reply
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                • declanD declan

                  @calum I’ll get the gasket switched round tomorrow and we will see how it goes thanks for you time mate

                  CalumC Online
                  CalumC Online
                  Calum
                  wrote on last edited by
                  #27

                  @declan As said, really that gasket should be renewed!

                  It's your bike do as you please, If you were a more experienced engine builder, I would defer to your judgement on whether or not that gasket could be reused.

                  But as you got it the wrong way around, I would say you're not too experienced.

                  It may work and cause no problems, it may fail on you when you're out and miles from home.

                  I would renew the gasket personally, saves yourself from headache down the line.

                  Always Originate, Never Pirate!

                  declanD 1 Reply Last reply
                  1
                  • CalumC Calum

                    @declan As said, really that gasket should be renewed!

                    It's your bike do as you please, If you were a more experienced engine builder, I would defer to your judgement on whether or not that gasket could be reused.

                    But as you got it the wrong way around, I would say you're not too experienced.

                    It may work and cause no problems, it may fail on you when you're out and miles from home.

                    I would renew the gasket personally, saves yourself from headache down the line.

                    declanD Offline
                    declanD Offline
                    declan
                    wrote on last edited by declan
                    #28

                    @calum I didn’t put it on the wrong way it was already like that and I’ve worked on bikes all my life and did 2 years mechanics course at college but no I couldn’t say I’m an experienced engine builder but I wouldn’t re use a gasket if I thought it was bad

                    CalumC 1 Reply Last reply
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                    • declanD declan

                      @calum I didn’t put it on the wrong way it was already like that and I’ve worked on bikes all my life and did 2 years mechanics course at college but no I couldn’t say I’m an experienced engine builder but I wouldn’t re use a gasket if I thought it was bad

                      CalumC Online
                      CalumC Online
                      Calum
                      wrote on last edited by
                      #29

                      @declan Okay sorry bud. Was jut the vibe I was getting.

                      Put it this way, on engines, if you have two meeting surfaces, they should be surpressed with a gasket.

                      The reason why the inlet manifold doesn't need a gasket between the reed cage is because the inlet manifold is rubber,

                      But metal on metal definitely needs a gasket.

                      Always Originate, Never Pirate!

                      1 Reply Last reply
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                      • O Offline
                        O Offline
                        oldman
                        wrote on last edited by
                        #30

                        Experience has kicked me up the butt more than once (I am, after all, an old man!) and personally always use new seals,gaskets etc when refitting something, mainly because when problems arise like you are experiencing I know I can rule out a duff seal (you do get duff new ones occasionally, quality counts) and have been using Athena kits that have proved to be reliable.There is nothing worse than stripping something down you have just meticulously rebuilt because of a "minor" hiccup. By the way, I hate fitting that rubber boot as well, my fingers are a bit to pudgy to fit comfortably in the airbox

                        declanD 1 Reply Last reply
                        0
                        • O oldman

                          Experience has kicked me up the butt more than once (I am, after all, an old man!) and personally always use new seals,gaskets etc when refitting something, mainly because when problems arise like you are experiencing I know I can rule out a duff seal (you do get duff new ones occasionally, quality counts) and have been using Athena kits that have proved to be reliable.There is nothing worse than stripping something down you have just meticulously rebuilt because of a "minor" hiccup. By the way, I hate fitting that rubber boot as well, my fingers are a bit to pudgy to fit comfortably in the airbox

                          declanD Offline
                          declanD Offline
                          declan
                          wrote on last edited by
                          #31

                          @oldman thanks guys just pretty discouraged right now just feel like I can’t catch a break hopefully if I keep going it will work as it should

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                          • O Offline
                            O Offline
                            oldman
                            wrote on last edited by
                            #32

                            Know how you feel, felt the same when my inlet rubber split, take a break and get back to it with a clear head.

                            declanD 1 Reply Last reply
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                            • O oldman

                              Know how you feel, felt the same when my inlet rubber split, take a break and get back to it with a clear head.

                              declanD Offline
                              declanD Offline
                              declan
                              wrote on last edited by
                              #33

                              @oldman thank you hopefully it will start and idle tomorrow

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                              • S Offline
                                S Offline
                                scrimsmustang
                                wrote on last edited by
                                #34

                                Is this reving high as soon as you start it ? Common things that will cause it also are a blown or incorrectly sealed cylinder base gasket or a leaking left crank seal, its usually the left side that goes they dry out and perish over time. Only a couple of quid and easy to fit, same with the base gasket.

                                declanD 1 Reply Last reply
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                                • S scrimsmustang

                                  Is this reving high as soon as you start it ? Common things that will cause it also are a blown or incorrectly sealed cylinder base gasket or a leaking left crank seal, its usually the left side that goes they dry out and perish over time. Only a couple of quid and easy to fit, same with the base gasket.

                                  declanD Offline
                                  declanD Offline
                                  declan
                                  wrote on last edited by
                                  #35

                                  @scrimsmustang when first started it was perfect but soon as i gave it a nice rev it acted up

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                                  • O Offline
                                    O Offline
                                    oldman
                                    wrote on last edited by
                                    #36

                                    Not trying to teach you to suck eggs but is it possible slide binding on carb interior? Just wondered if that might explain the cable coming adrift also?

                                    declanD 1 Reply Last reply
                                    0
                                    • O oldman

                                      Not trying to teach you to suck eggs but is it possible slide binding on carb interior? Just wondered if that might explain the cable coming adrift also?

                                      declanD Offline
                                      declanD Offline
                                      declan
                                      wrote on last edited by
                                      #37

                                      @oldman possibly I just started it up and still the same I did notice the slide was sluggish but it was still coming to rest

                                      declanD 1 Reply Last reply
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                                      • declanD declan

                                        @oldman possibly I just started it up and still the same I did notice the slide was sluggish but it was still coming to rest

                                        declanD Offline
                                        declanD Offline
                                        declan
                                        wrote on last edited by
                                        #38

                                        @declan okay so it’s working now the oil pump had stopped pumping had air in it no idea how but I guess that was my fault i wd40 every cable and after many hours it’s going but the cable keeps slipping out the carb does anyone have a fix for this?

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                                        • O Offline
                                          O Offline
                                          oldman
                                          wrote on last edited by
                                          #39

                                          Something must be missing. Can you post some pics up so I can compare with mine? Is the cable new(ish)?

                                          declanD 1 Reply Last reply
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