one piston frozen in cylinder, need advice

[tgm_enterprizes]

On my 1970 n600 that sat for 30 years, the driver side piston is really stuck in the cylinder.
so far I have tried
1.Penetrating oil (2 months , no difference).
I now have the engine out, the head off and the piston looks like it has melded against the cylinder wall. (no gap, it looks like its hard corroded to the wall. (Odd since the cylinder wall is smooth and the head looks great. I guess a little water got in or somehow dripped in it and caused this issue)
I tried beating the piston, drilling the top outer edge and more beating. (piston is now ruined, cylinders are probably hone-able)
Then I heated up the piston top using a mapp gas torch, more beating.
Then an air chisel around the top edge, more beating. All with no sign of it loosening.
My thought is now running to me cutting the cylinder vertically (down the front and down the back) and pulling it off the piston.
Piston is 1.6 inches down from the top edge of the cylinder. I have an aluminum bar between the block and steel liner at the bottom of the cylinder. (So the rod is not at the bottom of it's stroke).
If I had an acetylene torch, I would melt the piston out, but don't have one.
At some point, I will give up and get another engine. (I really wanted this to remain a numbers matching since it's a 1 owner texas car, 30k miles).
Does (has) anyone have this type of stuck piston and what did you do?
Richard

[Bill]

Tom;
There comes a time when you have to decide to fish or cut bait.
I tried several ways too, it came down to cutting the cylinder off the piston and then cutting the piston off the rod just to save the crank shaft.    There are plenty of cylinders and pistons available.  But crankshafts are scarce as hen’s teeth.
Bill.

[dana]

I got it apart today. I did it by using an air chisel (multiple tips). I broke the top out, then worked my way down one side. It was frozen all the way around.
I ruined one piston and I cracked the cylinder liner, but I feel happy to have finally beat this little darling into submission.
I am now in the market for new pistons/rings and cylinder plus gaskets . (Anybody got a set ready to go?)
Call me if yes, or I will buy off eBay or from Bill XXX-XXX-XXXX
Richard Morris

[Bill]

Just so we are all on the same page, the Honda 600 cylinder block is not sleeved they are part of the casting.
Bill

[dana]

I think you mave mis-read what was written. The cylinder has a steel (or maybe iron) sleeve or liner. I just walked out and stuck a magnet on it. The rest of the cylinder including the cooling fins is made of aluminum. Now, they may have cast the aluminum around the liner, but it's also possible that the liner is inserted after the aluminum was cast. Frankly, it doesn't matter to me which way it was made, the ferrous sleeve broke during my piston removal.
I said nothing about the block.
Richard

[dealadayray]

Richard;  You are correct, but it’s not sleeved, it’s part of the casting.  As such, it can’t be re-sleeved.
Bill

[zinc2u]

I have had sleeves inserted into at least 6 cylinder barrels for the 71 and 72 Honda 600s.  I never had a problem with them.  The machinist who did them for me specialized in resleeving cylinders.  He would break out the old liner and machine the top and bottom of the barrel to accept his sleeve.  It had a small flange on the top of the new liner and a ring which held the bottom section secure.  He also used to rebuild crankshafts for me ...... I would take him 2 cranks (each with a usable side) and he would give me back one and a box of pieces.   He closed up shop years ago, unfortunately.
What I had done with the 71 and 72 cylinders may not be possible with the 1970 barrel.  Someone who used to get their barrels resleeved told me the ribbing of the 70 barrel caused a problem.
that is what I know,
Dale

> Richard;  You
> are correct, but its not sleeved, its part of the casting.  As such, it > cant be re-sleeved.
> Bill
> From:
> 2cylinderhondas@yahoogroups.com
> [mailto: 2cylinderhondas@yahoogroups.com ]
> On Behalf Of
> Richard Morris
> Sent:
> Wednesday, January 19, 2011 7:09
> PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> RE: [2cylinderhondas] one piston
> frozen in cylinder, need advice
> I think you mave mis-read what was
> written. The cylinder has a steel (or maybe iron) sleeve or liner. I just > walked out and stuck a magnet on it. The rest of the cylinder including the > cooling fins is made of aluminum. Now, they may have cast the aluminum around > the liner, but it's also possible that the liner is inserted after the > aluminum was cast. Frankly, it doesn't matter to me which way it was made, the > ferrous sleeve broke during my piston > removal.