Cbr125r downpipe header is stuck

Move it to the Technical section and you might get some help there.
 
If he has the time @Brian P knows his stuff and has had those bikes apart before. I haven't personally touched one so the picture doesn't make sense to me.
 
Degumotorbike said:
Hey went to change my exhaust has it was blowing etc, when I went to remove it the exhaust snapped and the header is still on and won’t move
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Get in there with a Dremel and grind a couple of slots, then pick the remainder out.
 
TK4 said:
Get in there with a Dremel and grind a couple of slots, then pick the remainder out.
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I would chisel that out. You want to fold the wall of the broken pipe inward. An air chisel will make short work, if you don't have one, you can use a hammer with a punch, cold chisel, or large flat screwdriver. Just be sure you are only striking the pipe, not the port material.
 
Mad Mike said:
I would chisel that out. You want to fold the wall of the broken pipe inward. An air chisel will make short work, if you don't have one, you can use a hammer with a punch, cold chisel, or large flat screwdriver. Just be sure you are only striking the pipe, not the port material.
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Agree. I wouldn't want a grinding disc that close to the inside of the engine (especially one without an oil filter). Focus on getting one part of the pipe folded in, grab on tight and twist and the rest should peel away from the wall. If the really doesn't want to work, then try another cut/fold.
 
GreyGhost said:
Agree. I wouldn't want a grinding disc that close to the inside of the engine (especially one without an oil filter). Focus on getting one part of the pipe folded in, grab on tight and twist and the rest should peel away from the wall. If the really doesn't want to work, then try another cut/fold.
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A Dremel lollipop is not a disc.
 
Degumotorbike said:
Tried blow touching it it’s not moving
The chistel isn’t working
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I assume you mean propane? That wouldn't have a chance. Tons of metal to sink heat and it is exposed daily to a flame the size of the pipe.

How is chisel not working? It has to work. Given enough energy in the hits and number of hits, you can chisel anything apart, it may just take a while. How heavy/what type of hammer were your using? I am assuming cold chisel and not wood chisel?
 
years of corrosion with dissimilar metals will have that welded in the hole. if you can cut a couple slots in there with an occilating tool you'll have better luck, but its a small space. I'd go at it with a flat blade screwdriver that you dont need and a dead blow metal hammer and work your way around the circle. try not to beat up the surrounding metal the pipe is stuck in.
I agree if you have a propane or similar torch your wasting your time, and heating things inside that exhaust port that dont need that heat.
 
Please don't take this as an insult.
What you did to get yourself to this point pretty much shows us your mechanical lack of skills. Trying to fix the mess by yourself imho is pointless. Get proper help before you make this unfixable.
 
Oh fun. I know exactly where that spot is. The header pipe is plain steel (cheap bike), and rusts through, meanwhile the end of it seizes to the copper gasket between that and the cylinder head.

Brute force will break stuff. The oxygen sensor is right there in the exhaust port, and to me, it looks like you've already torched that. It also looks like one of the exhaust studs has come out of the head. That's not a big issue on its own, but you need to be careful.

FYI if this is for a 2011-on CBR125, I have an almost-complete bike in parts that you can have cheaper than a new cylinder head and a set of tires (which are good on mine). The cylinder head, and the exhaust system, are already removed for you. (Con-rod big-end bearing has a knock, and the piston and cylinder walls are done thanks to not having an oil filter plus the debris from the bearing getting in there.) PM me if interested.
 
Brian P said:
Oh fun. I know exactly where that spot is. The header pipe is plain steel (cheap bike), and rusts through, meanwhile the end of it seizes to the copper gasket between that and the cylinder head.

Brute force will break stuff. The oxygen sensor is right there in the exhaust port, and to me, it looks like you've already torched that. It also looks like one of the exhaust studs has come out of the head. That's not a big issue on its own, but you need to be careful.

FYI if this is for a 2011-on CBR125, I have an almost-complete bike in parts that you can have cheaper than a new cylinder head and a set of tires (which are good on mine). The cylinder head, and the exhaust system, are already removed for you. (Con-rod big-end bearing has a knock, and the piston and cylinder walls are done thanks to not having an oil filter plus the debris from the bearing getting in there.) PM me if interested.
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So do you not have a small bike on the road anymore or did you get another one?
 
GreyGhost said:
So do you not have a small bike on the road anymore or did you get another one?
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It's occupying my workbench, where it has sat since I diagnosed the rod knock, while I ignore what I eventually want to do with it. (Bike has 70,000 km of being beaten on, mostly at wide-open throttle) If someone makes a reasonable offer for a bike in boxes, I'll sell it. If it's still occupying my workbench when I get bored this coming winter, perhaps I'll fix it. Good tires, good bodywork, good frame. Engine is out of the bike and the top-end is apart. 2011 orange and silver.

I have enough other toys to play with.
 
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