Used Derbi Start 5 engine. This is the peak of moped tech.
These engines have an improved transmission that use modern scooter style clutch and variators. You can slap a brand new Polini variator on these if you want.
These take all of the same popular cylinders as the Flat Reed. Kickstart means no need to worry about a starter clutch.
This is a used engine. It has dirt, grease, and a couple scrapes. It turns over fine and sounds healthy. Still, sold as-is. No returns, refunds, or exchanges.