8407.29.00.30 - 746 W or greater, but not exceeding 18.65 kW

This HTS classification, 8407.29.00.30, specifically designates internal combustion piston engines designed for marine propulsion with an inboard drive system. The defining characteristic of this category is its power output range: engines rated at 746 Watts (or 1 horsepower) or greater, but not exceeding 18.65 kilowatts (or 25 horsepower). These engines are typically employed in smaller recreational boats, tenders, and auxiliary power units where this specific power band is optimal for performance and efficiency.

To correctly classify an engine within this group, it is crucial to distinguish it from its sibling categories. Engines with a power output of less than 746 Watts are classified under 8407.29.00.20. Conversely, any marine propulsion engine with an inboard drive and a power output exceeding 18.65 kilowatts falls under the sibling category 8407.29.00.40. Therefore, the precise kilowatt or horsepower rating is the primary determining factor for differentiating between these closely related classifications.

As this HTS code represents a leaf node within the Harmonized Tariff Schedule, there are no further subcategories. This means that all engines meeting the criteria of being spark-ignition internal combustion piston engines, for marine propulsion, with an inboard drive, and falling within the 746 W to 18.65 kW power range, are classified directly under this specific HTS number. Classification decisions should therefore rely solely on the accurate measurement and documentation of the engine's power output.