Which engine was Yamaha's first DEC outboard?

Yamaha's first DEC (Digital Electronic Control) outboard engine is indeed the F300TXR 5.3L V8. This engine introduced a significant advancement in technology, providing precision control over throttle and shifting, which allows for smoother operation and improved fuel efficiency. The DEC system enables users to have a more responsive and easily adjustable power management experience, making it a standout option in Yamaha's outboard range.

The F300TXR's incorporation of DEC technology set a benchmark for subsequent models, influencing the design and features of later engines. This innovation is particularly noteworthy as it represents Yamaha's commitment to integrating advanced technology into their marine products, improving overall user experience and performance on the water.