8407.31.00.40 - Less than 746 W

This HTS classification, 8407.31.00.40, specifically identifies reciprocating piston engines designed for the propulsion of vehicles classified under Chapter 87, where the engine's power output is less than 746 Watts. These engines are typically found in smaller, lighter vehicles, including certain types of motorcycles, scooters, electric bicycles with auxiliary engines, or specialized utility vehicles. The defining characteristic for this subcategory is its low power rating, indicating smaller engine displacement and less demanding operational requirements compared to higher-powered engines.

The distinction from its sibling category, 8407.31.00.80 ("Other"), lies solely in the specified power output threshold. While both subcategories cover reciprocating piston engines for vehicle propulsion with a cylinder capacity not exceeding 50 cc, 8407.31.00.40 is exclusively for those producing under 746 Watts, whereas 8407.31.00.80 encompasses all other engines within that capacity range, including those at or above the 746 Watt threshold.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. The classification is complete at this level, with the specific power output serving as the final distinguishing factor for these particular vehicle propulsion engines. Classification decisions for engines falling under this code should therefore focus on confirming the engine type (reciprocating piston), its intended use (propulsion of Chapter 87 vehicles), its cylinder capacity (not exceeding 50 cc), and its power output (less than 746 W).