backbone bracket thread size

[WannaBeFabrication]

anyone know the thread size for this bracket? its the perfect spot to mount my regulator and I can't seem to figure it out.

 

[member28833]

Reasonable guess.. 1/4-20

 

[WannaBeFabrication]

Reasonable guess.. 1/4-20

I've already tried all the bolts I'd think it would be and nothing I have fits, including 1/4-20. It's definitely a metric and not looking for guesses...

 

[member28833]

Cool pic. My point is that it is not an original bracket. So you have to try a variety of bolts. If you post an accurate thread minor diameter and a closer view. I'll accurately guess by the machinists hand book specs.

 

[WannaBeFabrication]

oh shit,I'm sorry. I thought it was an original bracket. sure looks that way atleast (welds consistent with others, factory frame paint) I'll get more info for you in a few

 

[member28833]

M6 x 1 example

 

[Steve C]

That's an original bracket, my '83 frame has it. M6x1.00 threads right in to both holes.
your results may vary

 

[member28833]

Cool ! So it is original
I've not owned an XS late enough to have seen that. Thanks -R

 

[Team Junk]

Cool ! So it is original
I've not owned an XS late enough to have seen that. Thanks -R

Funny. Someone here in the last couple of days mentioned having their regulator mounted on the frame backbone so I guess that is how it was done.

None of my frames have it.

Anyone know what mounted there?

 

[Jim]

Anyone know what mounted there?

Combined Reg/Rec... 80 and up.

 

[Team Junk]

Seems like a wet and nasty spot to mount electronics. Glad the TCI box wasn't mounted there.

 

[Jim]

Seems like a wet and nasty spot to mount electronics. Glad the TCI box wasn't mounted there.

The plastic false fender does a pretty good job of keeping it dry.

 

[5twins]

Yes, that's stock for the '80 and up TCI bikes. TCI black box was right behind it, hanging off the bottom of the battery box. Earlier bikes hang the rectifier there.

 

[member28833]

I feel kinda bad now about not knowing this

And again reminded to stay on track with the 78-79 stuff

 

[WannaBeFabrication]

Thanks everyone! It's the same thread as the starter cover bolts which seem to be M6x1 like Steve said. Don't know why I didn't try that before.