Holes drilled in Swingarm, bad or no big deal?

Discussion in 'The Garage' started by mikesova, Oct 23, 2013.

  1. mikesova

    mikesova Michigander

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    aluminum.
    #21
  2. Beezer

    Beezer Long timer

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    I'd plug em to keep them from filling up with water. wouldn't worry about the strength
    #22
  3. jules083

    jules083 Long timer

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    Both of my sportsters, late 90's models, and my 2013 dyna have passenger pegs on the swingarm. I rode on the back of a friend's sportster with swingarm pegs when I had a breakdown once, it wasn't bad at all.

    Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
    #23
  4. stainlesscycle

    stainlesscycle Long timer

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    drill some small drain holes in the bottom - if they're not already there...
    #24
  5. Maggot12

    Maggot12 U'mmmm yeaah!!

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    JB weld and thread a short bolt in there.
    #25
  6. sailah

    sailah Lampin' it

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    I welded up a swingarm for a buddy who had a DR250 or something. Aluminum. The kickstand had worn a hole, actually a long trough, 5 times bigger than that hole. No issues.

    [​IMG]

    [​IMG]

    Personally I wouldn't worry about it. If it ever does crack, I'd buy one on ebay, change out the bearings and ride on.
    #26
  7. Mgbgt89

    Mgbgt89 Long timer

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    I think its a great design. Just yell to your passenger to give you some extra rear preload for the rough stuff. Works great.
    #27
  8. LuciferMutt

    LuciferMutt Rides slow bike slow

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    It will be fine. Small round holes do very little to the integrity of straight bars under relatively minor loads.

    Would it be better without it? Sure. The truth is, though, most of us will never come close to the structural limits of a part like that during the lifetime of the motorcycle. Almost guaranteed that something else is going to fail before the swingarm does.

    Tapping it and putting a bolt in it is going to do absolutely nothing to help the integrity and will likely make it worse since the threads are now creating stress risers in the material (ie places for cracks to start).

    Welding in a sleeve? Unless you are really good at welding aluminum properly, and most people aren't, you are going to make it worse than it is now.
    #28
  9. WebGringo

    WebGringo Adventurer

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    JB weld is your friend. Make a note when you buy it, bitch about it, but at the end of the day JB fixes that in 10 minutes.
    #29
  10. wheeler23

    wheeler23 Adventurer

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    Think of a swing arm as a steel floor or ceiling joist. A box tube with a hole in the side will not effect a load applied in a vertical direction. Joist get their strength from the top and bottom straps hooked together by "x" braces with it being mostly open from the sides. A round hole will not create a stress riser and I wouldn't think twice about it being a safety issue. Put a plastic grommet plug in it to keep out dirt and water and ride it! Just an honest opinion from a deg. engineer.
    #30
  11. mamm

    mamm < advertise here! >

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    What's the difference?










    :hide

    Now seriously, I wouldn't worry about the swingarm - as said before, I'd worry about what else the previous owner did...

    I wouldn't buy it.
    #31
  12. 30Bones

    30Bones Long timer

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    Run it as is, it's not a big deal at all.
    #32
  13. kubiak

    kubiak Long timer

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    lol!
    #33
  14. Boatman

    Boatman Upward and onward!!

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    ^^^^^^
    Exactly!

    Cosmetic issue only.

    If the holes bug you, just patch them with JB Weld or run a bolt through it with a lock nut.
    #34
  15. cjbiker

    cjbiker Nobody's Robot

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    I don't know if it makes a difference, but the swingarms on these bikes are made with a C-channel and then have a thinner aluminum piece welded on the inside. Oh, and they come with several holes for the brake line clamps and chain slider.

    [​IMG]

    I'd suggest that you get him to knock $100 off the price and buy the one I offered you :lol3

    Be warned that the swingarm bolt on the XR250/400 can be very difficult to remove. Next XR I buy, I'm bringing a breaker bar and a few sockets and checking if the bolt is siezed before I hand over any cash :deal
    #35
  16. mikesova

    mikesova Michigander

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    I'm going to wait a couple weeks and do just that. I probably won't be replacing the swingarm though. I've heard it can be a real biotch to get the bolt out.
    #36
  17. Twin-shocker

    Twin-shocker Long timer

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    Why not just get someone to TIG the holes up? Looks a nice bike other than the holes, and if he cant sell then get the seller to arrange the welding? (very easy about 20 minutes work).
    #37