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HSChapter 84
U.S. imports of spark-ignition reciprocating & rotary internal combustion piston engines, nesoi (HS 840790) totaled $45.2M in April 2026, traded with 24 countries.
Last updated: April 2026 dataHeading 840790 serves as the residual category for spark-ignition piston engines not covered by the aircraft, marine, or vehicle-propulsion headings — encompassing engines for lawn and garden equipment, generators, construction machinery, and other non-road applications. Its twelve 10-digit lines are organized primarily by power output, with dedicated lines for agricultural and horticultural machinery (8407901010, 8407901050, 8407901060) and a gas-engine line (8407909010). Japan and Thailand lead US supply, with China also a major source; Chinese-origin engines in this category may be subject to Section 301 tariffs, a significant cost factor for importers of small engine-powered outdoor power equipment.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Headings 840731–840734 are restricted to engines for propulsion of Chapter 87 vehicles (road vehicles, motorcycles, tractors, etc.). Heading 840790 captures all other spark-ignition piston engines — including those powering lawn mowers, chainsaws, portable generators, and construction equipment — that are not designed for vehicle propulsion. The intended application and the equipment's own tariff classification are the key distinguishing factors.
The heading's lines cascade through several watt-based breakpoints: under 746 W (8407909020), under 4,476 W (8407909030/8407909040), 4,476 W to 18.65 kW (8407909060), and over 18.65 kW (8407909080), with parallel agricultural-use lines at similar thresholds. Importers must obtain rated power output in watts from the manufacturer's technical data sheet and apply it consistently across all entries to avoid classification discrepancies.
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Monthly import values over time