Broken rider peg mount thread

[CanadianSteve]

Evening gentlemen. I’m looking to repair broken threads on the upper left rider foot peg mount and looking for advice.

I was initially thinking of drilling, tapping, and threading a replacement M10x1.25 stud and securing it with red loctite. Upon reviewing the thickness of the remaining mount, I’m thinking the M10 stud will be too wide for the above process. Now I’m wondering if an M8 stud would be the better option.

At this time I do not have access to a welder but if the general consensus is welding, I’ll figure out a way to have someone weld it.

Thx as always,
Steve

 

[Jim]

Have a look here. M10/M8 stud.

 

[gggGary]

The early bikes used M8 threads there.

I think I'd just saw the threads off an M8 bolt from the junk box. AKA "make a stud" drill and tap m8.

 

[CanadianSteve]

Ok awesome thank you both. Just wanted to make sure I was heading in the right direction.

I’ll look for an M8 to M10 adapter locally and if I can’t find one, will just go with the M8 stud option.

Thx guys, much appreciated.

 

[gggGary]

I'd also be conservative on how deep I drilled, mebbie 10mm? Didn't have much luck googling thread depth needed in steel. Use a bottoming tap or if you have a cheap tap that doesn't owe you much grind off the tapered end to use as a bottoming tap. red loctite.
PS tighten in an 8mm bolt with a nut loosely threaded on then cut it to length unthread the nut over the cut to help clean up the thread.

 

[gggGary]

PS I did this repair on a rear top shock mount about 10,000 hard ridden and loaded miles ago.
repeat
PS tighten in an 8mm bolt (cuz you can use a wrench to tighten it!) with a nut loosely threaded on then cut it to length, unthread the nut over the cut to help clean up the thread.