Snapped thread tool.

[R1stu]

So for a while now I have been trying to drill out a rounded exhaust bolt from the gv125. Managed to drill out and tap it however the helicoil came out. So I tried putting a little deeper thread and the tool snapped clean off.

Now what's the best way to remove this now?
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Carbon closet tart! https://www.bikepics.com/members/r6stuk/02r6/
Stolen bike. 2000 R1: https://www.bikepics.com/members/r6stuk/00r1/
Current bike 1991 Honda ST1100 Pan European, 1986 Honda cb350sg (Finished)

[bugeye_bob]

cant you grip the broken part with anything to unscrew it, give the broken tool few gentle taps and see if it loosens it, even a small dab of super glue may be enough to unscrew the broken part of the tool.

[Fisty]

A tap extractor.

Ive had success smashing a tap out with a punch but Would I risk that in a head?

Probably not.
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[Vincent]

That's a bitch. Your best bet may be to get the head off and take it to a machine shop to do.

If you try to drill it....and I wouldn't recommend it.....go for a left handed drill.
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[Pete.]

[R1stu]

I'll grab a pic later, was looking at them flute extractors but can only see them from the states. Was thinking maybe 4 nails down the side and rotate out with them?
____________________
Carbon closet tart! https://www.bikepics.com/members/r6stuk/02r6/
Stolen bike. 2000 R1: https://www.bikepics.com/members/r6stuk/00r1/
Current bike 1991 Honda ST1100 Pan European, 1986 Honda cb350sg (Finished)

[Vincent]

Nope......I'd snatch Petes hands off at the elbows if I was you
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[R1stu]

I would, if I knew enough about being able to put the engine back together working again wouldn't know how to set timing and all that shizzel
____________________
Carbon closet tart! https://www.bikepics.com/members/r6stuk/02r6/
Stolen bike. 2000 R1: https://www.bikepics.com/members/r6stuk/00r1/
Current bike 1991 Honda ST1100 Pan European, 1986 Honda cb350sg (Finished)

[Vincent]

[R1stu]

Here's some pics

https://i145.photobucket.com/albums/r232/stuartkeith/DSC_0163_zpsw5zowpbe.jpg

https://i145.photobucket.com/albums/r232/stuartkeith/DSC_0164_zpsfrgqtngo.jpg
____________________
Carbon closet tart! https://www.bikepics.com/members/r6stuk/02r6/
Stolen bike. 2000 R1: https://www.bikepics.com/members/r6stuk/00r1/
Current bike 1991 Honda ST1100 Pan European, 1986 Honda cb350sg (Finished)

[Jmh600]

I'd personally try and use a set of circlip pliers (the fixed type ones with the round posts, not the interchangeable head type) and get one pin down either side and twist it out.... Also, lots of wd40
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Jmhmotorcycles

[Ariel Badger]

I would be sending Pete some pounds to cover his time along with your head. That looks like it needs sparking out.
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[Islander]

You can dissolve a steel tap out of aluminium by using a very concentrated solution of alum. It may take a few days but it works. It'll need a thorough degreasing first of course.

[Fisty]

[Ribenapigeon]

Maybe use a dremel and grind a slot into the top of the tap then a flat ended screwdriver to unscrew it? If you also grind into the area surrounding the bolt hole you could build it back up afterwards with an aluminium brazing rod.

[Fisty]

[Ribenapigeon]

[Fisty]

[Ribenapigeon]

So make your point fisty.

[Fisty]

[Ste]

Listen to Pete and Mr Fisting.

[bikenut]

you have access to a mig welder and the skill to use one??
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[Fisty]

[Ariel Badger]

[Ribenapigeon]

I suppose you could grind into the stud hole then rather than screww a new stud in weld or braize one in.