Honda 250HP iST | BF250DUDA

This is the BF250DUDA, Honda's 250 HP iST outboard built around a six-cylinder, 3583cc four-stroke with a 30-inch shaft and electric start. It is set up with standard propeller rotation, so it suits a single-engine transom rather than a paired twin install. New.

What drives it

Shift and throttle run through Honda's electronically governed iST control rather than a mechanical cable, so gear changes and throttle position are coordinated through one system. The six-cylinder block spins to a 5300-6300 rpm full-throttle range and draws fuel through EFI for cold starts and a steady idle. Dry weight runs 628 pounds, so plan the transom bracket, lift capacity, and rigging tunnel with that figure in mind before the engine arrives.

What to check before mounting it

Confirm the boat is built for a T-type trim mount and a 30-inch shaft; mounting a shaft that is too long or too short for the transom hurts both handling and cooling. A propeller is not bundled with this unit, so size one to the boat and gearcase separately before launch day. A freshwater flush fitting, onboard charging, and power trim and tilt are all built into the package, along with the printed owner's manual.

Q: Does it come with a prop? No, the propeller ships separately from this engine.

Q: Is this a counter-rotation engine? No, rotation here is standard; Honda sells a counter-rotating version of this iST block under a different model code.