Stot wrote:
If M8 'fits', The bolt you lost probably wobbled around making it baggy before it dropped out altogether. You might need to get a helicoil in there.
Cheers
Stot
Cheers
Stot
sounds about right 
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| Lost rear caliper mounting bolt XB12 https://www.ukbeg.com/forum/viewtopic.php?f=8&t=25609 |
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| Author: | regcheeseman [ 20 May 2025 18:49 ] |
| Post subject: | Lost rear caliper mounting bolt XB12 |
I lost my XB - S rear caliper to carrier bolt somewhere on the way to work today. Thankfully we have stocks of metric and imperial fasteners so I grabbed a few 5/16 and 3/8 and went out on my break to fix it but it seems the thread is a M8 - but a very baggy M8? The 5/16 UNC wasnt going to go in without a fight and I didnt want to force it. What fastener should be fitted? |
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| Author: | Stot [ 21 May 2025 13:05 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
If M8 'fits', The bolt you lost probably wobbled around making it baggy before it dropped out altogether. You might need to get a helicoil in there. Cheers Stot |
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| Author: | barney [ 21 May 2025 19:48 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
Stot wrote: If M8 'fits', The bolt you lost probably wobbled around making it baggy before it dropped out altogether. You might need to get a helicoil in there. Cheers Stot sounds about right
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| Author: | regcheeseman [ 21 May 2025 23:31 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
It fell out in 20mins on a 14 mile run - doubt much wear happened in that time? I had whipped the caliper off pre mot to grease sliders and check pads. But yeah, there may be historical wear...can I tap a M8 out to 5/16 UNC or is that just going to leave another baggy mess. Not a fan of the helicoil, maybe I'll weld up and re-machine. |
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| Author: | Stot [ 22 May 2025 14:09 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
5/16 major diameter is only 7.94mm so you would be threading into already loose threads, no meat to it. If you can fit a 3/8 bolt through the hole in the calliper you could probably use that, you could even open the hole in the calliper without issue if you don't mind that kind of thing. I did this to my front calliper as the bolt was stripped and glued in when I got it. You would need to weld, redrill and tap or Helicoil it to do it properly really. Cheers Stot |
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| Author: | brother in buells [ 23 May 2025 20:17 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
Just go get the proper bolt for it! No need for screwing things up even more. Twinmotorcycles do have them , but maybe Maz to!? |
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| Author: | barney [ 24 May 2025 08:05 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
brother in buells wrote: Just go get the proper bolt for it! No need for screwing things up even more. Twinmotorcycles do have them , but maybe Maz to!?
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| Author: | brother in buells [ 24 May 2025 17:29 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
https://www.twinmotorcycles.nl/webshop/ ... &aid=54863 https://www.twinmotorcycles.nl/webshop/ ... &aid=47680 |
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| Author: | brother in buells [ 24 May 2025 18:02 ] |
| Post subject: | Re: Lost rear caliper mounting bolt XB12 |
Which one are you missing? |
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