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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.
Monthly import values over time
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