ST90 frame rust - is it junk?

Discussion in 'CT90, CT110, ST70, ST90 Discussion' started by placek59, Mar 3, 2021.

  1. placek59

    placek59 Member

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    I picked up a rough ST90 a couple years ago. The guy said it was solid and the frame was in good shape. I didn't get any great pictures but it was cheap. I drove just over an hour to go pick it up and when I got there I noticed rust holes in the frame. I knew I could make money on ebay with what parts were good so I bought it anyway. Now you know the story... Is the rust in the frame fixable ? or just junk? I don't want a show bike, just a rider.
     

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  3. lukelaw1

    lukelaw1 Active Member

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    anything is repairable as long as you are willing to pay for it.
     
  4. cjpayne

    cjpayne Well-Known Member

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    I would only think thats going to get worse.
    To really find out, I would take it to a body shop.
     
  5. b52bombardier1

    b52bombardier1 Well-Known Member

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    Looks bad to me and I'd seek a different frame for less money than it will cost to fix this one. To be sure, get this frame media blasted inside and out to see that it is likely in worse shape than we realize.

    Rick
     
  6. red69

    red69 Well-Known Member

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    Depends on your ability to do the repair. That looks like inside out corrosion, possibly caused by a wet battery. Here's what I had to deal with on two S90"s. The white one had battery damage and the other one (in primer) was damage from mouse urine. I used a wire feed welder after cutting out the corrosion and replacing it with new sheet metal.
     

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  7. Old Guy Too Many Bikes

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    Nice job on the S90 frame. It's not easy to wire feed on such thin metal. Even at the lowest setting, with .035 wire, I have a tough time not burning through. When I can, I use an air flanger to keep from having to butt weld.
     
  8. DAX-IT!!!

    DAX-IT!!! Member

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    From the single picture you've provided, the bits that are rusty seem perfectly salvagable. Just get it sandblasted, then you can see the real extent of the old tin worm and make a proper assessment. Its amazing what sandblasting and a MIG welder can do ;).

    I think if it were mine, i'd give it a go!!:)
     

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