Ok I sold my 5100s a few months back. Don’t need these extras anymore. Piston and cylinder are like new. Very low time. Case halves have some paint fade and some mag rot, as pictured. Think they are still usable. Muffler should be non cat muffler. Haven’t cut it open to check but since it was from a 5100s not a 5105. White coil has that higher rpm. Most if not all parts should fit a 510, 5100s and 5105.