Exhuast studs

[kramdra]

So on boxing day me'cbr600 downpipe fell apart

I got it off but most of the studs snapped with 10mm sticking out.


These are properly stuck in. Ive trye lots of penetrating oil.

The one that came out squeaked, really high pitched, as the bolt took some of the threads with it.



Ive tryed welding to em. the stus just broke a little further up. They are very stuck.



Im going to try some more things, but any ideas on here?

[Ichy]

I can be of no help to a solution but I had the exact same problem on my old CBR. welding is pointless as the studs seem to be quite brittle. A lot of heat worked on most of the stuck ones, I'm talking gas torch heat. One of them just would not budge no matter what I did. I ended up drilling it out and tapping again.

If you can attach the exhaust with what remains it might be worth running the bike up to temperature and seeing if that helps. The aluminium block should expand more than the steel studs.


Wait until you see the price of new studs .
A good suggestion from Stinkwheel is to fit the exhaust with brass nuts. They are soft and will strip the thread rather than snap the stud.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[Pete.]

When you say you 'welded to them' - did you use the trick of putting a nut over the stud and welding down in the hole to weld the nut to the bolt, or did you do something different?
____________________
a.k.a 'Geri'

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

[kramdra]

How did you drill it out? I dont want to take the engine out or head off! !!!

The bike shop wants to do that.

[Ichy]

I was lucky since it was the one on the end and there was plenty of space. Unless you have similar luck I think you may struggle without removing the head.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[m1tch]

[Raffles]

[Mikey3]

or once they are out just routinely slacken them and retighten them - maybe with every oil change or something, save them logging themselves in, as well as copper slip of course, or perhaps some locktite.
Mike
____________________
'04 Yamaha WR450F
'99 SV650 Streetfighter Project - mid build
'Motorcycling is about what you do; not about what you own, or how much you spend on it'

[kramdra]

Will be using stainless studding and nuts if I get them out.

I dont think copper grease is is great for exhaust studs. I will be using graphite spray. Im also making up some caps to go over the studs to prevent dirt getting on them.

[Robby]

Don't use stainless, 3 reasons:

1. Stainless and alloy react, turning the alloy to dust.
2. When stainless snaps off, it's a bitch to drill out.
3. Although stainless doesn't rust, the road crap still gets baked into the threads. Even with little caps on the covers, dirty water will seep in over time and bake on.

Mild steel studs with brass or copper nuts. If you are having to put so much force onto the nut when tightening that you strip the threads, you are putting on too much force.

I get M6 or M8 car exhaust studs off ebay. A quarter of the price of buying the same thing sold as a bike stud. I think I bought a full set for some manner of VW with a V6 engine last time, lots of studs for about a tenner.


As for removal, I have often been left with no option but to drill. Left hand drill bits can help, but more often its just a case of using progressively larger bits, and quite possibly re-tapping the hole if the last bits of thread are stuck into the alloy. Decent drill bits are your friend, I forget which particular steel alloy is the one to go for, but they were slightly more expensive than titanium coated ones (still fairly cheap though, about £20 for a set).

[Pete.]

[Raffles]

[kestrel]

[Ichy]

[Noxious89123]

Aren't the studs on an F4 made of alloy? When I put new downpipes on I changed some of the studs as the nuts were seized onto them (Luckily the studs just came out of the head instead). The new genuine Honda studs looked like alloy to me, not steel. The nuts are just plated steel I think, as mine have rusted to fck, despite looking all nice and shiny like chrome when new. Again, genuine honda parts.
____________________
'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi

[Ichy]

The OEM ones I had to remove were definitely steel.
____________________
https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[MaybeGuy]

You'll have all the room you need if you take off the front end and radiator.
____________________
Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Ichy]

[MaybeGuy]

[Blau Zedong]

[Ichy]