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Like others have said, sounds like it is seized up. it is probably not even worth the hassle to fix. Bike was probably neglected since day one and maintenance was never kept up on since it is a kids bike. You will most like need complete top end rebuild including cylinder unless you get it bored and sleeved but not even sure how feasible that is on an 80. With any luck the bottom end is salvageable but most likely not because again, it was probably not taken care of right since day one and it is due for a bottom end rebuild even if it survived the seizure. I would try and sell it as is for whatever someone wanted to give me for it. It will cost more to rebuild than to just buy a used one that already works and that is not even factoring in other things that need replaced from standard wear and tear.
JMO
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