Stuck pilot screws

[EazyDuz]

Some potato has messed with the pilot screws in the past, but never put the rubber bungs back in the ends to protect them from the elements.
One screw turns freely, but the other has a mangled head and is seized. I have already sprayed Plus Gas on it and left overnight but there just isnt enough grip there to undo it. I was going to richen the mix to see if it cures my exhaust backfire on decel. Have lightly tapped a screwdriver with a hammer to try and create a new slot but to no avail, not going to try that again as i run the risk of fucking up the threads in the carb body as well.
How would i go about removing it now? its about an inch deep into the carb body, shown almost in the centre of this pic:

https://i.imgur.com/pDgPuZy.jpg
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To shreds you say? Tss tss tss

[The Shaggy D.A.]

I've read on another forum that drilling a shallow pilot hole in the centre of the screw then hammering in a Torx bit works - I'll try to find the thread.
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Chances are quite high you are not in my Monkeysphere, and I don't care about you. Don't take it personally.
Currently : Royal Enfield 350 Meteor
Previously : CB100N > CB250RS > XJ900F > GT550 > GPZ750R/1000RX > AJS M16 > R100RT > Bullet 500 > CB500 > LS650P > Bullet Electra X & YBR125 > Bullet 350 "Superstar" & YBR125 Custom > Royal Enfield Classic 500 Despatch Limited Edition (28 of 200) & CB Two-Fifty Nighthawk > ER5

[The Shaggy D.A.]

Found it - shame the piccies aren't there now.

https://suzukisavage.com/cgi-bin/YaBB.pl?num=1350749896/0#0
____________________
Chances are quite high you are not in my Monkeysphere, and I don't care about you. Don't take it personally.
Currently : Royal Enfield 350 Meteor
Previously : CB100N > CB250RS > XJ900F > GT550 > GPZ750R/1000RX > AJS M16 > R100RT > Bullet 500 > CB500 > LS650P > Bullet Electra X & YBR125 > Bullet 350 "Superstar" & YBR125 Custom > Royal Enfield Classic 500 Despatch Limited Edition (28 of 200) & CB Two-Fifty Nighthawk > ER5

[EazyDuz]

Thanks for the link, will give it a go if i really need to.
Assuming the carb will need to be removed anyway?
____________________
To shreds you say? Tss tss tss

[Ariel Badger]

The only thing I would differently is this....Turn a steel guide that fits into the hole that should have had the rubber bung in it with a hole in the centre the same size as the drill you are going to use. This will take any hit or miss out of drilling the screw accurately. Do not make it so that it is a tight fit as you will need to remove it!
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Bikers make great organ donors, get 115 on your licence today.

[Pete.]

If I was to tackle that I would strip the carbs down on the bench, heat the area with a hot air gun, get some release agent in there, heat it again and then have a go.

One thing - NEVER us copper grease on idle mixture screws, or any other brass part in a carb housing. It's a good way of making them seize in solid due to dissimilar-metal corrosion.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[EazyDuz]

Yea some kind of hollow metal tube going down the hole to protect the inside walls would help, would also mean its drilled centrally
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To shreds you say? Tss tss tss

[Vincent]

Reverse drill and a L/H bit might get it out.
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Space Is Deep

[EazyDuz]

I have since changed exhaust gaskets and it still pops on decel, so i do need to free the fucker.
Used plus gas every day for a week and it still wont turn, the head is totally mangled now.
I read in another thread of someone using a 'pin vice' to create a hole in the screw, then gluing in an allen key, then removing that way.
Can any of these ideas be done with the carb on the bike? I really dont want to take them off
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To shreds you say? Tss tss tss

[Pete.]

Nope, it's carbs-out time.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[EazyDuz]

[EazyDuz]

bump
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To shreds you say? Tss tss tss