Honda does not allow a cylinder to be repaired by reboring it, because Honda does not provide oversized piston and rings set. I understand that in the spare parts market you can order a piston and rings in oversizes(not OEM). In my used cylinder, I think it would be possible to do a light honing, replace a piston and new rings, but I decided to replace the cylinder as well. Regarding purchasing spare parts independently, it's a hobby within a hobby, you do shopping, and there are the stores you learn to prefer more, but it varies from country to country, and there is a matter of warranty, and delivery times...
