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    #1

    Dent removal from pipe bend

    Has anyone got a method to remove a bottoming out dent from the lower bend in a header pipe?? Heat can be applied to these as they are gonna be either painted flat black with high temp header paint or wrapped. Best heat source i have is a MAPP gas torch.

    I know they make expanders for straights, but how would i get to the lower bend ???
    Last edited by chuck hahn; 08-26-2015, 09:45 AM.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.
    Tags: None
    #2
    Chuck, those header pipes are usually double walled, so unless you can remove the inner pipe it's going to be a difficult job.

    I have looked at fixing a set a while back and couldn't come up with anything simple except one of those big hooked tools used for popping out dents in tanks.

    Good luck.
    2018 Honda Africa Twin AS
    2013 DR 650 Grey, sold 1981 GS 650E Silver,
    1980 GS1000ST Blue & White, X2
    2012 DL650 Vstrom Foxy Orange, in storage
    1981 CT110 X2 "Postie Bikes" Gone to a New Home.
    2002 BMW 1150 GS Blue & White - Sold
    1975 BMW R90/6 Black - Sold 1984 GS1150EF Sold
    1982 BMW R100 Africa trip, Stolen - Recovered- Sold
    1977-1980 Suzuki GS550, GS1000E, GS1000S GSX750, GSX1100,s
    Hondas ST90, CR125 CB175 , CB350 CB750, NSU Quickly, Yamaha RD's 350/400,

    Comment

      #3
      The double wall is the thing that makes it very hard, I've seen big metal balls on bent rods designed for shaping the dents out of pipes but the double wall makes it very difficult.

      If you blocked the ends and put in some air pressure, say 10/15 psi and warm it in the dent till it pops out? You could control the amount of heat to shape the dent coming out.
      Just a suggestion.
      sigpic

      Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

      Comment

        #4
        Drill a hole and use a slide hammer? If it's going to be painted or wrapped anyway no one will ever see the weld.

        A stud welder might work too.


        Life is too short to ride an L.

        Comment

          #5
          This is the Supertrapp exhaust that came on my 83 Honda CB 650 Nighthawk project. Probably never find another set easily. Anyway they are rusty and will need cleaned up well before painting ( which is what I really want to do ). But the wrap is another route to kinda hide the dent some. Not sure of they are single or double walled pipes.

          Pipes as seen here before the tear down to recondition the bike..

          http://vid1148.photobucket.com/albums/o569/chuckhahn1/SAM_0087_1.mp4
          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

          Comment

            #6
            Chuck, if you do end up using the wrap, here's a nice video on the correct procedure.

            how to use fiberglass exhaust pipe wrap for an old school vintage motorcycle rat rod look
            https://www.youtube.com/watch?v=Ja6uqdaWkRc
            Get your Ichiban Tee ! https://teespring.com/stores/ichiban-motoSubscribe to Ichiban Moto ! Want stickers ? Read Below !In this video, I use some exhaust...


            David.
            2018 Honda Africa Twin AS
            2013 DR 650 Grey, sold 1981 GS 650E Silver,
            1980 GS1000ST Blue & White, X2
            2012 DL650 Vstrom Foxy Orange, in storage
            1981 CT110 X2 "Postie Bikes" Gone to a New Home.
            2002 BMW 1150 GS Blue & White - Sold
            1975 BMW R90/6 Black - Sold 1984 GS1150EF Sold
            1982 BMW R100 Africa trip, Stolen - Recovered- Sold
            1977-1980 Suzuki GS550, GS1000E, GS1000S GSX750, GSX1100,s
            Hondas ST90, CR125 CB175 , CB350 CB750, NSU Quickly, Yamaha RD's 350/400,

            Comment

              #7
              I used this tool to get the dents out of the Supertrapp on my 85 750EF.

              They where pretty bad!

              They where not perfect but a lot better.

              And looked OK painted up.

              Made the bike quieter to was a +

              Comment

                #8
                Cool, did you use heat too or was it enough to do it cold?
                sigpic

                Don't say can't, as anything is possible with time and effort, but, if you don't have time things get tougher and require more effort.

                Comment

                  #9
                  Guess I need to see if the pipe is two piece or not and then measure the bore.
                  MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                  1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                  NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                  I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                  Comment

                    #10
                    The ball needs to be a bit smaller than the inner diameter of the pipe, or it will wedge itself in there.

                    I believe the ball on my tool is 1", the inside of the pipe on my bike is 1 1/8".

                    It left a few small wrinkles like it did on SVSooke's pipe, but it's on the bottom, hopefully nobody has the chance to see it.

                    .
                    sigpic
                    mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                    hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                    #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                    #2 son: 1980 GS1000G
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                    Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                    (Click on my username in the upper-left corner for e-mail info.)

                    Comment

                      #11
                      My bend is around the actual bottom bend, so it looks like i may have to get a heavy spring such as the ones on a drain snake and weld to the ball. Otherwise its not gonna go around the corner. Which leads to another thing to ponder..heat. If Its heated and real hot, would trying to force the ball around the corner actually make a huge OUT dent and make the situation all that much worse?????
                      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                      NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                      Comment

                        #12
                        This method looks like a lot of work, but might be what you need.

                        1983 GS750ED-Horsetraded for the Ironhead
                        1981 HD XLH

                        Drew's 850 L Restoration

                        Drew's 83 750E Project

                        Comment

                          #13
                          I can do this easily..just need to go get a thin cutting wheel for the grinder.
                          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                          Comment

                            #14
                            I think some heat from the torch would help a lot too

                            Comment

                              #15
                              Originally posted by tatu View Post
                              Cool, did you use heat too or was it enough to do it cold?
                              It was good cold.

                              Originally posted by chuck hahn View Post
                              Guess I need to see if the pipe is two piece or not and then measure the bore.

                              Originally posted by Steve View Post
                              The ball needs to be a bit smaller than the inner diameter of the pipe, or it will wedge itself in there.

                              I believe the ball on my tool is 1", the inside of the pipe on my bike is 1 1/8".

                              It left a few small wrinkles like it did on SVSooke's pipe, but it's on the bottom, hopefully nobody has the chance to see it.

                              .
                              Yes it's a 1" ball bearing on about a 2' mild steel shaft.

                              Originally posted by chuck hahn View Post
                              My bend is around the actual bottom bend, so it looks like i may have to get a heavy spring such as the ones on a drain snake and weld to the ball. Otherwise its not gonna go around the corner. Which leads to another thing to ponder..heat. If Its heated and real hot, would trying to force the ball around the corner actually make a huge OUT dent and make the situation all that much worse?????
                              The mild steel will bend quite a bit so I'm told.It would probably not work with heat as it needs grease to slide in and get it out.

                              Comment

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