Broken down pipe stuck

[Cbr125guy]

My downpipe on my 2007 cbr 125 busted. I'm buying a new one tomorrow but as I went to take it off I noticed there's a chunk that's really stuck and I really have no idea what to do. Any advice would be appreciated!

 

[mistersouthpaw]

Is it that piece near the top ?

 

[mistersouthpaw]

Can you get a pair of vice grips on it? Soak the area with some pb blaster and try to wiggle it? I can’t really tell what piece broke off

 

[Cbr125guy]

I can get a grip of it on one side of the pipe the other side can only close on the engine block.

 

[Cbr125guy]

That's before I took it off the bike.

 

[mistersouthpaw]

Is that whole flange end of the header pipe rusted off?

 

[Cbr125guy]

This is what the down pipe looks like now

 

[mistersouthpaw]

The rusty ring around the exhaust port is part of the header?

 

[Cbr125guy]

I'm pretty sure the black part it part of the pipe.

 

[Cbr125guy]

Ya I'm pretty sure the grey rusted ring around is connected to the block.

 

[J_F]

hit it with a hammer

 

[Cbr125guy]

But I don't want it or pieces falling in the engine

 

[mistersouthpaw]

Get some pb blaster on there and see if you can wedge a flathead or a small prybar in between the pipe end that’s broken and the engine flange where the pipe mates to

 

[mistersouthpaw]

But I don't want it or pieces falling in the engine

Stuff the engine hole with a clean rag or something

 

[J_F]

the pipe is steel...not likely to break into pieces
it will break the rust free and loosen up the bit stuck in there

 

[mistersouthpaw]

the pipe is steel...not likely to break into pieces
it will break the rust free and loosen up the bit stuck in there

Couple small whacks would probably do it just stuff the hole if you’re worried, or try to get a pry bar in there. Penetrating oil will definitely help

 

[Cbr125guy]

So now I'm pretty sure that whole brown ring comes off but it's still jammed I tired hitting it with flat head, hammer it won't budge.

 

[Trials]

You can find some pictures of it here: Honda CBR 125 R Cylinder head barrel and piston top end strip down

The whole thing has to come out, maybe a little tap, tap, tap on the sides of the stuck part. One more possibility, they are dissimilar materials, heat the head and cool the stuck ring if you can. Maybe a little heat with a propane torch on the head and a blast of component cooler or ice to cool the flange.

 

[oioioi]

Would heating it up with a torch help?

 

[Cbr125guy]

I don't think I would want to put a flame near there to be honest. I've tired knocking it with a hammer won't seem to budge really.