Stuck seat post

[gog440]

Hi
I have recently decided to try and get a bit fitter so I bought a very cheap old Ridgeback mtb off ebay, the seat post is completely wedged in place, I have removed the bolt holding it in place but nothing at all will make the bloody thing move (I need to lower it a bit because I am a short arse and cant reach the floor properly where it is).
i have tried shocking it with a big hammer, wd40, vice grips to try and turn it so I can wiggle it, nothing has worked at all. I dont have access to a blow torch so heat is out.
It looks to me like the seat post is aluminium and I am pretty sure the frame is steel so I wondered if I had dissimilar metal corrosion sticking them together but I will be buggered if I can get the damn thing to move


I knew there were a few minor issues with the bike before I bought it but I have managed to fix everything else (loose spokes and stem, brakes not working)

[Jimbo.]

It's seized.

First up: Plusgas. Lots of Plusgas. Then a bit more for good measure. Forget WD40: it's useless.

Turn the frame upside and dump a load of it down the seat-tube (either by removing the BB or going through the bottle mounts). Let it soak for a few hours/overnight. Then try wrenching the thing out.

[gog440]

Jimbo. said:

It's seized.

First up: Plusgas. Lots of Plusgas. Then a bit more for good measure. Forget WD40: it's useless.

Turn the frame upside and dump a load of it down the seat-tube (either by removing the BB or going through the bottle mounts). Let it soak for a few hours/overnight. Then try wrenching the thing out.

Thanks

I guess I need to go get some plusgas tomorrow.

[Bacon Is Proof]

After following the advice above, stick the seat in a vice and use the whole bike as a big lever to twist it off.

Carefully.

It's a method I've used to great success (not with my own well lubed bikes, of course) but I have heard of people damaging frames this way.

[gog440]

Thanks for the advice guys, the bike is a very retro ridgeback 602gs that I paid a whole £27 for on the bay so I wasnt expecting perfection I just didnt expect adjusting the seat to give me so many problems!
The decent seat, stem,rims and tyres were a bit of a bonus though