Broken Shock Stud

[tatu]

And another note, shock studs are not replaceable so putting a new bit on is not possible

Ahem....

http://www.thegsresources.com/_forum/showthread.php?232668-Stripped-Shock-Mount-Repair&highlight=shock+mount+repair

[cowboyup3371]

Ahem....

http://www.thegsresources.com/_forum...k+mount+repair

Sorry Tatu, I misread your original thread as you used a bolt but see now it's an extra stud. Wish I had one like that and access to a lathe

[cowboyup3371]

Ugghhh, I hate my life sometimes. Cut off the old threads, drilled out the hole, and was cutting what I figured would be the last turn when the dang tap broke off inside.

I ended up cutting off the stud and i'm going to now drill through the frame to slide in a M12x1.50x100mm long bolt. If this works then my friend will weld it into place for me.

[AMK]

Soooo close.
The bad thing with tapping is that you have all the work done till you hear that snap.
I liked tatu's procedure too.

[geol]

The tap is a pain to drill out but you might be able to drill through it with a carbide drill bit. You can get a large enough automotive exhaust manifold stud to do the fix. Most auto parts stores will have 1/2" exhaust manifold studs in stock which is about the same size as an M12 bolt. You can just screw it into the tapped hole and then tack weld it. I would recommend using cutting oil (not WD40) when doing this stuff and to use a carbide tap... not one of those made in China no-names from Harbor Freight. I have give you some free advice on this but I have myself paid for this bit of education. Most taps ARE made in China these days but reputable brands won't snap like the ones that come in the $10 kit from Harbor Freight.

[AMK]

Keeping as much of the original stud would be preferable. Hitting the bottom of the hole with the tap will increase the odds of breakage.
At this point I would highly recommend tatu's fix. If that fails then weld.

[cowboyup3371]

I don't have a parts bike to take a stud off of so I'm working with the bolt idea. I'm going by Dayton Tool Crib tomorrow to get a 12mm drill bit since the best I can do for now is a 1/2" (12.7mm). If I cannot get the 12mm drill bit then I'll work with the 1/2" go from there.

My friend will then weld in the bolt to ensure it doesn't go anywhere. Thank you all for the help.

[salty_monk]

I would use the highest grade bolt you can find if you replace the whole thing. 10.9 minimum would be my thinking.

[cowboyup3371]

We're done with it after my friend welded in the bolt this evening. We then installed the shock and he tested it by jumping on it with all of his close to 300 pounds. I'll give it a test ride with my own 200 pounds either tomorrow or Sunday to see how it holds up but for now it's pretty solid. No, she won't be allowed on it until I have ran the bike for a few dozen miles to ensure it won't bust on her

[Steve]

I'd say dress up that joint with a file so the washer can fit up against it better and you will be set.

.

[tatu]

I don't have a parts bike to take a stud off of so I'm working with the bolt idea. I'm going by Dayton Tool Crib tomorrow to get a 12mm drill bit since the best I can do for now is a 1/2" (12.7mm). If I cannot get the 12mm drill bit then I'll work with the 1/2" go from there.

My friend will then weld in the bolt to ensure it doesn't go anywhere. Thank you all for the help.

It's good that you have resolved this.
Just to say that the same method can be used using an ordinary bolt, also to add that the original stud on the bike is nothing special, just plain old mild steel.

[AMK]

Good deal. You should be fine.

[Redman]

Ah... part of the fun of having a 30+ year old bike, eh...?

So, at some point here, we should have an update to the "new rider" thread.....?


.

[tkent02]

Looks frail to me. All of the weight is on the welded bolt, not on the thicker shoulder as it was originally. When you will find out is when you hit a big hole or something and bottom the shock hard, probably not when you want a shock mount to break off. A few dozen miles is not likely to bottom out the shock, which will put many many times the stress on that weld that a 300 lb rider does sitting on it.