snapped off pivot pin bolt on K75 transmission. Thoughts?

[k75newb]

I swapped out my 96 K75 transmission to a K1100 transmission. All was going well. I was doing the work in a friends garage with limited time and space (but it had heat. A necessity at this time of year in Alberta). I didn't have my torque wrench with me when tightening things up, so put most together snug. Transmission mounts fine, right side swing arm pivot pin with 3 bolt plate and left side adjustment pin fine, driveshaft fine, final drive fine, popped the wheel on so it could be moved. Got it home to tighten to spec the bolts in question. When I put the torque wrench on the 3 bolt pivot pin the third bolt to be torqued snapped off.  :mbird
Can I just support the swing arm/final drive assembly and remove the right side pivot to tap out the stud? Or do you think I should disassemble the rear end completely (remove wheel, FD, driveshaft) to do stud removal?

[Scott_]

Where did it snap off at, is it flush with the housing, or is it flush with the bushing such that if you removed the bushing can you get vice grips on it?
If you think you can get an extractor in the broken stud without drilling it completely thru, I'd say go for it.

[subforry]

Don't even think about drilling out a bolt/stud without left hand (reverse) drill bits.  Set can be bought for less than $20.

[rbm]

I think you might be able to get the right side pivot out without having to disassemble the entire rear end.  Make sure no weight is on the swingarm by lifting the rear end until the rear shock is fully extended (maybe support the rear frame, remove the rear tire, and support the swingarm with a jack). Loosen the left pivot so that the swingarm is not prestressed.  Then you should stuff rags in between the transmission housing and swingarm to make sure that the swingarm does not drop to the right when you remove the pivot.

Extract your broken bolt and reassemble everything.

[k75newb]

Thanks all. Yes, it appears that it snapped off within the flange hole area so if I remove the pivot pin there should be enough to get some vice grips on (fingers crossed). Regardless, I'll pick up some left hand reverse drill bits should I need to drill it. I'll do what I can to take any weight off the entire assembly and rear end and give it a go. I'll then carefully chase the holes with a tap and clean the bolts for re-install.

[bocutter Ed]

It may not even need 'extracting'. It's not like you broke the head off a seized bolt. Could be it's loose in the hole?

[johnny]

every motobricker needs a full set of vice grips... 2" to 12"... those and a 6 in 1 is all i carry for tools anymore... o... and a 12mm allen too... ha ha ha... lets roll...

j o