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Tag mount plate

Discussion in 'Technical' started by shansel88, Dec 28, 2017.

  1. shansel88

    shansel88 Member

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    2004 Big Dog Chopper - but I have now had 2 issues with plate welded to frame for tag bracket.
    1st - original tag bracket - mounted to welded plate with 1/2 bolt - snapped the plate just below thew the bolt holt - bolt fell out- tag was dragging by light wire.

    @nd bough aftermarket - mounts with 2 1/4-20 bolts - mounted tag vertical this time - and same thing - 1 1/4 bolt - snapped the frame plate - 1/2 way in hole and allowed bolt to come out??

    Any heard of this?? I dont understand what is causing the frame plate to snap? It sees no real weight- vibration?? WTF?? lol
     
  2. Brandon Downey

    Brandon Downey Active Member

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    If you have time, maybe post a pic of how it's mounted. Then we can brainstorm ideas on how this could be happening.
     
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  3. Hirter6Pack

    Hirter6Pack Not Quite A Guru
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    You got a hell of a left turn.:whoop:
     
  4. shansel88

    shansel88 Member

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    I will try and get some pics - But basically the plate everyone has is cracking through bold holes and letting the bolt fall out.

    At first I thought maybe it hit when i turned left - as it was mounted horizontal - though it thought primary belt drive would hit first??

    But after this second break - from a hole i drilled - I was thinking woman was standing on it or something. Maybe put her on a diet??? but the more i look its just not that close to the foot peg - nor would it be comfortable?? so?????
     
  5. Brandon Downey

    Brandon Downey Active Member

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    My first thought is stepping up to a higher grade bolt (like Grade 8), but we definitely need to see what could be causing the issue. Is there any scraping on the bottom edge of your plate holder that would indicate it made contact with the pavement during a left hand turn?
     
  6. shansel88

    shansel88 Member

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    Nope - no scraping - and higher grade bolt isn/t the solution, the bold isnt busted - bolt and nut on bold are still on the mounting bracket when the frame plate breaks. I'm actually busting the plate in the frame (between the swing arm tubes). The only purpose of that plate is to hold the tag, and its literally snapping off?? Maybe it was too hot when welded and it brittle?? I really dont know if anyone has seen this or not??
     
  7. Brandon Downey

    Brandon Downey Active Member

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    Oh now I understand. I'm not a welder, so I can't offer any solid info pertaining to that process but what you said sounds like a possibility. Someone with welding experience will chime in here I'm sure.
     
  8. chubs

    chubs Well-Known Member

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    If the plate is breaking out from the bolt holes, I believe the problem could, ( that is COULD ), be due to the edge of the holes being sharp, something called "stress risers". If the holes have a smooth radius to both sides of the plate, a lot of the stress is spread out over the plate instead of right at the edge. Not sure where your plate is breaking, but I think you said at the holes. Am I correct in that ? And you're right, there's a lot of vibration going on down there.
     
  9. pauldeepsea

    pauldeepsea Well-Known Member

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    Do you have washers in between the bolt and where it mounts into the bracket. There is allot of vibration in our bikes and the washers help distribute the force. I am thinking you should have a washer and a lock washer in between the head of the bolt. The washers will also keep the bolts tight


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  10. shansel88

    shansel88 Member

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    excellent idea- i dont have a washer- and come to think of it my old one did not as well?? I guess it is vibration cracking the plate - but damn i've just never seen it before and i've broken it twice in a year - smh
     
  11. Mickeetwo

    Mickeetwo Guru
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    I believe Paul is right. Mine has a washer and a lock washer on it. I've never heard of this problem before
     
  12. pauldeepsea

    pauldeepsea Well-Known Member

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    Every once it awhile I get things right.
     
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  13. awg

    awg Well-Known Member

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    My 04 RT had the same thing. Washer and lock washer. Good place to start.
     
  14. shansel88

    shansel88 Member

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    I will add some washers and try again. I love my baby, so I'll do what it takes!

    bike 1.jpg bike 4.jpg
     
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  15. pauldeepsea

    pauldeepsea Well-Known Member

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    Nice pic. That should be or should have been picture of the month


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  16. pauldeepsea

    pauldeepsea Well-Known Member

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    Add a washer and a locking washer. I think this will fix the problem
     

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