SOHC.co.uk Forums > CB350/400

Snapped bolt, now what?

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taysidedragon:
If the screw went right through to fit a nut on the inside of the leg, I bet there was some corrosion on the thread which was sticking out. That's probably why it got stiff then snapped when the corroded part was inside the threaded hole.
If so it might come out easier if you try and remove it from the inner side of the slider. Reversing back out.

exvalvesetdabbler:
My thoughts as well.  Drill from the opposite side to where the bolt head was.  Did the bit that came away with the bolt head have threads. Ie a set screw or a plain shank.  Beginning to wonder if someone just hammered a bolt into what was left of striped threads in which case it might press out after applying heat.

andy120t:
Depending on the outcome it might be more cost effective to find a used replacement.

Athame57:

--- Quote from: andy120t on July 01, 2025, 07:41:06 PM ---Depending on the outcome it might be more cost effective to find a used replacement.

--- End quote ---
Thought of that. I found a good one on 400four site, just in case I need that contingency plan.  ;)

Murf:
As said Probably a real bodge with a bolt of some odd thread just forced in. But easy fix for a competent engineer. 

Get old bolt out as described earlier in this thread, then if resulting hole is too big for a thread insert,  drill to nice clean hole, make up a stainless steel bush with internal m6 thread that is an interference fit in hole,  put bush in freezer for 1/2 hour, heat area around hole, press cold bush into hole, use some locktight if desired, let it all cool and you now have a nice repair that can’t be seen.

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