What year are your 40 Yamaha 2 stroke outboard motors serial numbers 417721 and 413988?

The Yamaha 2-stroke outboard motors with serial numbers 417721 and 413988 were likely manufactured in the early 1990s. Yamaha typically uses a serial number system where the first few digits can indicate the year of production. For precise identification, it is recommended to consult Yamaha's official resources or a dealer with access to their database.