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    3MB head.... Should I buy it?

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    • dtluke
      dtluke last edited by

      So after scouring the internet I found one for sale - in France... Its off a derbi bike but they use the same engines? Anyway. Would you buy this for £35? Does that head look damaged or just dirty?

      alt text

      alt text

      dtluke 1 Reply Last reply Reply Quote 0
      • dtluke
        dtluke @dtluke last edited by dtluke

        @dtluke wow, I actually managed to upload a photo! It's £24 for the head and £11 delivery from France.... A decent price but the ad says (impact to the combustion chamber) that's from google translate.... I'm guessing I should leave it but advice welcome as I would quite like a 3MB head!

        1 Reply Last reply Reply Quote 0
        • Mightyman
          Mightyman Global Moderator last edited by

          You would need work done to that one... The pits in the centre are where loose metal has been smashed against it.

          dtluke Calum 2 Replies Last reply Reply Quote 1
          • dtluke
            dtluke @Mightyman last edited by

            @MIGHTYMAN hmmmm, sounds painful. J guess you can't sand it back too much as it'll take away the correct compression ratio?

            1 Reply Last reply Reply Quote 0
            • Mightyman
              Mightyman Global Moderator last edited by

              Not too sure on the specifics. But I imagine it would either be just about salvageable if the pits weren't too big, OR a specialist would have to actually build it up by adding ally back into it. Either way keep looking around and a cheaper option might pop up soon.

              dtluke 1 Reply Last reply Reply Quote 1
              • dtluke
                dtluke @Mightyman last edited by

                @MIGHTYMAN Thanks. I agree - was just being hopeful someone would tell me it'll be fine 😉

                1 Reply Last reply Reply Quote 0
                • Calum
                  Calum @Mightyman last edited by

                  @MIGHTYMAN said in 3MB head.... Should I buy it?:

                  You would need work done to that one... The pits in the centre are where loose metal has been smashed against it.

                  That OR engine detonated. Detonation is engine killer.

                  Absolute waste of money buying that head it's fucked. You would have to have it worked, in which case you might as well get the 3BN head worked

                  1 Reply Last reply Reply Quote 1
                  • AndyYam
                    AndyYam last edited by

                    wanna buy a 4dl head?

                    Darty dtluke 2 Replies Last reply Reply Quote 0
                    • Darty
                      Darty @AndyYam last edited by

                      @AndyYam Yes.

                      1 Reply Last reply Reply Quote 1
                      • dtluke
                        dtluke @AndyYam last edited by

                        @AndyYam is the 4DL as good as the 3MB? I've just put on my third head gasket now (Athena gasket) and still have a leak so I'm guessing my 3bn is warped anyway 😞

                        Burridge 1 Reply Last reply Reply Quote 0
                        • Calum
                          Calum last edited by

                          Look at this on eBay http://www.ebay.es/itm/302062068939

                          dtluke 1 Reply Last reply Reply Quote 2
                          • dtluke
                            dtluke @Calum last edited by dtluke

                            @Calum thanks Calum, think I will go for that if you reckon its a good buy? I really can't find much info on the web about putting a 4dl head on a 3mb00 DTR barrel? I assume it will be an improvement over the 3bn - especially if minesl is warped!

                            NINJA 1 Reply Last reply Reply Quote 0
                            • NINJA
                              NINJA @dtluke last edited by NINJA

                              Great find @Calum

                              @dtluke Genuine Belgarda parts are the perverbial needles in hay stacks - nuff said!!! 😉

                              1 Reply Last reply Reply Quote 1
                              • Burridge
                                Burridge @dtluke last edited by

                                @dtluke said in 3MB head.... Should I buy it?:

                                @AndyYam is the 4DL as good as the 3MB? I've just put on my third head gasket now (Athena gasket) and still have a leak so I'm guessing my 3bn is warped anyway 😞

                                Use a genuine Yamaha gasket when you put your new head on, a lot more money but it'll be worth it

                                1 Reply Last reply Reply Quote 1
                                • Calum
                                  Calum last edited by

                                  The 4dl head sits on a 3mb barrel. Graham Bell says the head is where the majority of the power is made. Get that right and you can't go far wrong.

                                  I have done many heads before and haven't had any problems with Athena. There is a tutorial on qhat you should do to prep the head and barrel using a sheet of glass and various grades of wet and dry paper. Do what I say in that turorial and it will seal.

                                  1 Reply Last reply Reply Quote 2
                                  • dtluke
                                    dtluke last edited by

                                    Cheers guys, I have bought that head. Looking forward to it arriving

                                    1 Reply Last reply Reply Quote 1
                                    • AndyYam
                                      AndyYam last edited by

                                      I think i have 1-2 4DL heads sitting around in the garage. I'm away for a week in Wales as of monday. If i have time before then ill get photos up in the for sale section. If not it'll be when i get back.

                                      What did that one on ebay go for? as a guide for price.

                                      1 Reply Last reply Reply Quote 0
                                      • kennymurphy97
                                        kennymurphy97 last edited by

                                        Will a 1989 3MB head fit the 3MB barrel of my 2000 dt?

                                        1 Reply Last reply Reply Quote 0
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