Harmonized System
U.S. imports of Spark-Ignition Reciprocating & Rotary Internal Combustion Piston Engines, NESOI (HS 840790) totaled $44.6M in September 2026, imported from 29 countries.
Importers of Spark-Ignition Reciprocating & Rotary Internal Combustion Piston Engines, NESOI paid $11.8M in duties in September 2026, an average duty rate of 26.83% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Spark-Ignition Reciprocating & Rotary Internal Combustion Piston Engines, NESOI imports of $44.6M in September 2026 ran 17% below the year-to-date monthly average of $53.5M.
Last updated: September 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.
683 import shipments a month
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.
Subheading 3 of 8 in heading 8407
Subheading 840790 · $44.6M of $1.0B
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8407909010 | Spark-Ign Internal Combust Piston Type Gas Engines | $14.1M | 24.37% | 99.71% | $3.4M |
| 8407909060 | Sp-Ig Int Comb Pst Eng, NESOI, 4476-18.65 Kw | $9.4M | 34.12% | 99.84% | $3.2M |
| 8407909040 | Sp-Ig Int Comb Pst Eng, NESOI, Less Than 4,476 W | $7.4M | 28.55% | 98.00% | $2.1M |
| 8407909080 | Sp-Ig Int Comb Pst Eng, NESOI, Exceeding 18.65kw | $7.8M | 17.20% | 98.07% | $1.3M |
| 8407901010 | Spk-Ig Pst Eng, Ag, Hort, Mc N/E 37.3kw | $5.6M | 14.98% | 100.00% | $841K |
| 8407901080 | Sp-Igint Comb Pst Eng Esc Air-Col, NESOI, Gt 37.3kw | $721K | 9.83% | 99.34% | $71K |
| 8407901020 | Sp-Ig Pst Eng, NESOI,/Ag,/Ho,/Mc Gt 4,476 W | $220K | 1.60% | 7.39% | $4K |
| 8407909020 | Sp-Ig Int Comb Pst Eng, NESOI, Less Than 746 W | $167K | 49.31% | 100.00% | $82K |
| 8407901060 | Sp-Ig Pst Typ Air-Col Eng, NESOI, Ag, Ho, Mach | $2K | 0.00% | 0.00% | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$44.6MYoY · free account
Exports
$33.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $641.0M of Spark-Ignition Reciprocating & Rotary Internal Combustion Piston Engines, NESOI and exported $473.6M.
Through September 2026. Source: U.S. Census Bureau.
Imports · September 2026
origin
China pays 46.1% duty; Japan 18.4%.
customs district
destination
entry
rate provision · imports
1.0% enters free of duty; duty collected equals 26.83% of imports for consumption.