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I've just got a bike off a friend to repair/service for him, it's an old steel kona. The seat post is seized solid into the frame, to make things worse there's no saddle on it as the previous owner decided to cut the ramp:bolts off the seat post where the saddle attaches to help in removing said post, what an absolute doughnut. So now i'm stuck with a post in a frame and no real leverage to twist it out,
Any ideas?
Various ways, my first method is to use a tube block onto the seatpost to get more leverage.
caustic soda down the bb end.
Fill the seat tube with Plus Gas with a bung in the hole at the top of the bottom bracket. Let it soak for a week. Then get the Stilsons on the seat post with the frame in a vice.
If that fails, and it did when I tried to free one a few years ago, Argus Cycles in Bristol can ream the seat post out of the tube. They did a cracking job on an old MK1 Heckler, you wouldn't even know they had been in there.
drill a hole through the stump post to insert some leverage & get down and twisty on it?
Caustic soda. Buy gloves, be patient, work in a very well ventilated area. If you're careful it'll dissolve out and leave no trace
Have you got access to a vice? strip frame and stick seat tube in the vice, use the frame as leverage.
Spray loads of penetrating oil in and around the seat-tube and leave for a bit- if you can remove the BB, you could turn the frame upside down and spray some in from that end too.
Remove wheels, turn frame upside down then as above clamp the seatpost in a vice (flattening the end) and use the frame for leverage.
If you don't have a vice then you could perhaps clamp on a pipe wrench or some mole grips or else drill a hole through the seatpost and feed through a length of metal bar (big screwedriver perhaps?) to give you some extra leverage
I second the seat tube in vice and frame as leverage.
ive totalled a frame doing that, just once mind.
ive also run a hacksaw blade down the inside of cut off seatpost till it would come out, if i had known how long it was likely to take i would have not started.
good luck
I've done this with a genesis 853 altitude frame and a seized aluminium seat post. I tried all of the above and eventually dissolved it out with caustic soda. I stripped the frame, plugged up all the holes with plasticine and mixed up some very strong caustic soda and dissolved it out over a week. Don't be tempted to put too much in, just be patient. I stuck the hose in and flushed it all out for a couple of hours after I took the seat post out. Worked a treat.