exhaust stud extraction - alloy head

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barker
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exhaust stud extraction - alloy head

Post by barker » Tue Aug 07, 2018 7:54 am

My exhaust studs on my alloy head scooter are refusing to undo.

I know they are a sod on a cub with an iron barrel but on an alloy barrel is there a easy way to get them out before I have to drill and tap?

I saw on YouTube, a guy heating the barrel with a flame then extracting the bolts. Is it that easy?
Last edited by Capitano on Tue Aug 07, 2018 8:36 am, edited 1 time in total.

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Capitano
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Re: exhaust studs

Post by Capitano » Tue Aug 07, 2018 8:34 am

That's how the exhaust nuts and studs came out of my 18 year old CBR1000 that hadn't been touched from new.

Not by me, mind. I took the view that I'd be better off booking a day's work and paying half to my local independent bike shop to do it, rather than spend 2 days doing it badly myself. 8-)

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Re: exhaust stud extraction - alloy head

Post by Diesel Dave » Tue Aug 07, 2018 11:38 am

Cub exhaust studs are in the alloy head.......

You need to get it as hot as you dare without melting the alloy or setting fire to the rest of the bike. That’s why welding a nut onto the stud remnants works as it gets the stud red hot but shouldn’t melt the alloy as there’s not enough time for the alloy to overheat.

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Re: exhaust stud extraction - alloy head

Post by barker » Thu Aug 09, 2018 6:09 pm

made a start on the job , has anyone got any tips as how to drill the studs straight

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Re: exhaust stud extraction - alloy head

Post by JOHNBOY » Thu Aug 09, 2018 6:25 pm

bolt the head on to a pillar drill rotate the plate to suitable angle bobs y uncle

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Re: exhaust stud extraction - alloy head

Post by barker » Thu Aug 09, 2018 8:40 pm

have not got a pillar drill , plus engine is still in the scooter

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Re: exhaust stud extraction - alloy head

Post by JOHNBOY » Thu Aug 09, 2018 10:18 pm

good luck

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Re: exhaust stud extraction - alloy head

Post by davebike » Fri Aug 10, 2018 7:09 am

Head and barrel off try heat and stud extractor
Next weld lump of steel to stud reheat to cherry red keep trying !
when stud snaps bolt to pillar drill or better a mill and use a bull nosed milling cutter !

Far from easy job
MUCH easer if
1 don't use stainless studs
2 always use copper or alley slip on studs

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Re: exhaust stud extraction - alloy head

Post by andyk1k » Fri Aug 10, 2018 8:16 am

Can l post,pistol handheld drill =scrap !

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Re: exhaust stud extraction - alloy head

Post by Tranberg » Fri Aug 10, 2018 1:55 pm

After you've broken the brittle stud extractor, next step is this guy: Spark erosion of broken tap

[youtube]https://www.youtube.com/watch?v=8VvLJWkFGIw[/youtube]

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