1972 ct70 exhaust pipe rust

Discussion in 'Tech Area' started by mxfj40, May 21, 2020.

  1. mxfj40

    mxfj40 New Member

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    I'm working on my 1972 CT70 looks like it's the original Honda muffer /arrester marked model 104 and HM098 when I shake it theres alot of loose rust inside. I've been shaking it and most came out the end and out the rear threadelette ( which is pulled away) for the guard mount. The exhaust seems to be real thin towards the back/ inside the metal dents easily even with soft hits from a plastic hammer. With that much rest coming out of it that you see in the pictures is it worth saving. I know these things are hard to come by
     

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  3. OLD CT

    OLD CT Well-Known Member

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    I wouldn't throw it out. I would blast some compressed air through it to clear out some more rust and use it. Looks like the rear shield bung needs repair and worth the time to fix it.
     
    racerx, allenp42 and kirrbby like this.
  4. mxfj40

    mxfj40 New Member

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    That sounds like a good plan of attack. Thanks OLD CT
     
  5. racerx

    racerx Administrator
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    They usually rot-out along the underside, toward the outlet. If the rust is reasonably localized, the thinned/perforated sections can be cut out, new metal welded-in. If you don't care about the aesthetics, the holes can be patched from the outside, using brazing rod & scraps of sheetmetal.
     

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