Ultimate Seizure

So yesterday after messing around getting my lawnmower running Dave came by to help me attempt to unseize the bike. So our plan was to put in gear and tow it behind his truck. We thought hey this will be simple he messed with it a little to see how seized it was and of course he had no luck. So I put the seat back on we grabbed my tow line hooked it up and we pulled. Several times we popped the clutch with it in gear jerking it along and we ended up going around my block and I think he was going up to about 30mph. No luck still so I am starting to think this bike might have been actually seized up before sitting for 20 years and that might be why it is seized up. Before I try to open the motor up I am going to try using a 50/50 mix of acetone and automatic transmission fluid. I have heard this is the ultimate for unseizing a really locked up motor. So I am going to let it soak for another week and then Dave and I will give it a shot again. My big concern now is if there is any scoring to the pistons at all.