Yes but it is very rare. I have found some with rust seized pistons and they were very old and sat a very long time in a shed. The moisture in the shed must have found it's way into the cyl. The oil from the gasmix keeps the cyl from rusting and I have restored 30 year old engines that sat for a long time it all depends. If it is rusted in the cyl it is not easy to repair but is possible.