I recently got a very nice Enya 60IIIB with a single ring. It had no compression due to the stuck ring and I have tried the following:

15 hours in a warm crockpot/antifreeze
24 hours in Acetone
300 degree oven

all without success. I accept that I will likely need a new ring, but right now I can't even get it off the piston, (short of hammers and vice grips!). I'll be ticked if I have to buy a piston too - this one is in great shape otherwise.

Any ideas?

Martin