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Buell Forum » THUMPer Forum » Blasting Away - The Thumper Quick board » Archive through June 15, 2010 » Broken exh stud: Helicoil or stepper stud? « Previous Next »

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The4ork
Posted on Thursday, June 10, 2010 - 07:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

what would you guys do, im gonna take the head off today and possibly try attack it myself, or taking it to a machinist

should i get it helicoiled? stepper stud?
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Ezblast
Posted on Thursday, June 10, 2010 - 09:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you can simply get it out, then I would get another stud and put it in. testing for fit, if loose, I would take back out and helicoil - if not loose, then I'd leave alone and go from there.
EZ
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The4ork
Posted on Friday, June 11, 2010 - 01:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

for one i cant get it out...

i tried an ez out, and all it did was drill through it but wont come out

so then i tried a slightly larger drill bit hoping maybe it would brake and come out...

my ez out was slightly off center, so i cant try any bigger drill bits without cutting in the head and cant get the dang thing out : (
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Reepicheep
Posted on Friday, June 11, 2010 - 08:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Here was my thinking when I had this same problem...

1) Start with just retapping.
2) If that pulls out, you are at about the right size for a heli coil.
3) If that pulls out, you are about at the right size for a tim-sert.
4) If that pulls out, send it to Wes Brown to repair and get it ported and get the parts for a big bore kit.

I never got past step 1 though... the retapped hole has always held (maybe 40k miles on two bikes).

It's easy to get that hole off center. Get the Jims tool, and that should line up the drill and let you machine it out.

If you really want to do it without the jims tool, and I wouldn't recommend it, you can use a tungsten carbide bullet shaped dremel bit to carefully machine out the old stud... but the deeper you go into the head, the harder it gets to do well. There are EDM solutions as well, no idea how much that costs.
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Buellistic
Posted on Friday, June 11, 2010 - 11:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

What happened to using REVERSE FLUTE DRILLS ???
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Ezblast
Posted on Friday, June 11, 2010 - 01:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Those work well as well, but are hard to find for a lot of folks - lol
EZ
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