U.S. exports of Spark-Ignition Reciprocating Piston Engines for Vehicles, Not Over 50 cc (HS 840731) totaled $113K in August 2026.
Spark-Ignition Reciprocating Piston Engines for Vehicles, Not Over 50 cc imports of $18K in August 2026 ran 177% above the year-to-date monthly average of $6K.
Last updated: August 2026 dataAt the smallest end of the vehicle engine spectrum, heading 840731 covers spark-ignition reciprocating piston engines with cylinder displacement not exceeding 50 cc, used in mopeds, small scooters, and light utility equipment classified in Chapter 87. The US schedule provides lines for engines at or below 50 cc with output under 746 W (8407310040) and those below 50 cc exceeding 746 W (8407310080). Japan and Germany are leading suppliers, though China is also a notable source — and engines of Chinese origin may be subject to Section 301 tariffs, a key cost consideration for importers of small-displacement powersports components.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
4 import shipments a month
Classification depends on the vehicle type. Heading 840731 covers engines for vehicles of Chapter 87, which includes go-karts (typically heading 8703 or 8704). However, if the engine is designed for a non-road application such as a lawn mower or generator, it would fall under heading 840790 instead. The intended end-use and the vehicle's Chapter 87 classification are the controlling factors.
The two active 10-digit lines under 840731 split on whether rated output is below 746 W (8407310040) or at/above 746 W (8407310080), in addition to the 50 cc displacement ceiling. Importers should obtain manufacturer power-output specifications in watts or horsepower (1 hp ≈ 746 W) to ensure correct line selection, as the distinction affects duty liability.
ImportsExports
Imports
$18KYoY · free account
Exports
$113KYoY · free account
Low of 8 reported months · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $170K of Spark-Ignition Reciprocating Piston Engines for Vehicles, Not Over 50 cc and exported $2.8M.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026 · imports 8 of 12 months reported. Source: U.S. Census Bureau.
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 |
|---|---|---|---|---|---|
| 8407310080 | Sp-Ig Rec Pst Eng for Prop Veh Ch87 (Lt 50cc 746w) | $13K | 14.73% | 100.00% | $2K |
| 8407310040 | Sp-Ig Rec Pst Eng for Prop Veh Ch87 (50cc Lt 746w) | $4K | 0.00% | 0.00% | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8407310000 | Sprk-Ign Piston Eng F Veh of Hdg 87, Not Exc 50 Cc | $113K |
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.
Subheading 8 of 8 in heading 8407
Subheading 840731 · $113K of $693.6M
Trade Directory
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Exports · August 2026
destination
Venezuela and Mexico together take 96% of it.
customs district
origin
entry
rate provision · imports
24.1% enters free of duty; duty collected equals 11.18% of imports for consumption.