Honda Express 1978 NC50 Piston ring issues

monolith /

Hello everyone! I need some advice on replacing the piston rings on my '78 NC50. The motor was rebuilt by a friend and then the bike was given to me but the rings were so expanded that they needed to be replaced. Well, I tried pulling the rings off to see what they could take, and they snapped immediately. I found some spare rings in a box with a spare motor, I tried to pull the spare rings off the other piston and they snapped too! Is there a secret to this procedure? Anyone? Please lend me your advice if you have any what so ever!!! Thanks!

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