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Stripped rear brake master cylidner mounting bolts!!

4108 Views 41 Replies 11 Participants Last post by  Veefer97
I have an 06 gixxer k6 and I stripped the shit out of these bolts trying to get them off:

They're only supposed to be torqued to 7 ft-lb per the service manual. But with their thread lock and the fact that they haven't been touched since mfg of this motorcycle they're practically welded in there.

They have a 4mm hex head which is tiny and didn't stand a chance with the force to get these off. I rounded the hole and the hex grip is gone.

Now I dremeled a nice slit to fit a flathead screw driver, but these fuckers won't budge. The flathead is stripping the slit and I can't get any leverage. They're mangled now and I think it's time for a screw extraction.

So 3 questions:

1) Does anyone have the size spec of these screw threads (width, length & thread)? Specifically the width so I know what size extractor bit to use.

2) Do you agree that it's time for a screw extract? What product is best and where to buy? EZ out? Home Depot? Auto store?

3) Extra opinions on this matter

:comp FUUUUUUUUUCK! :comp
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I myself prefer the extractor method. Use a left hand twist bit and many times it will come out when the pressure is lessened by the hole. If not, I use a set of snap-on extractors that I bought as a set with the left handed bits. I can't tell if the threaded portion passes all the way through the back of the mount from the picture, but it would be much easier if it does. Use cutting fluid and take your time to get the hole drilled straight through and you should have no problems. I also recommend chasing the threads with a tap when you do get it out.
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