Product classification

HS code for Small vehicle engine: 8407.31

Engines, reciprocating piston engines, of a kind used for the propulsion of vehicles of chapter 87, of a cylinder capacity not exceeding 50cc.

Classification of small vehicle engine under HS 8407.31

Small vehicle engines are classified under HS code 8407.31. This classification is governed by the rules of Chapter 84, which includes internal combustion piston engines. Heading 8407 specifically addresses spark-ignition reciprocating or rotary internal combustion piston engines. To be classified under the 8407.31 subheading, the engine must be designed for the propulsion of vehicles that fall under Chapter 87, such as motorcycles, mopeds, or small all-terrain vehicles. Furthermore, the engine must have a cylinder capacity (displacement) that does not exceed 50 cubic centimeters (cc). This displacement limit is a strict threshold; even an engine with 51cc would be classified under a different subheading. The classification is based on the physical characteristics of the engine—specifically its displacement and ignition type—rather than the specific vehicle model it is installed in. It is also important to note that this code only applies to spark-ignition engines; compression-ignition (diesel) engines are classified under heading 8408, regardless of their displacement. Proper documentation of the engine's displacement is essential for customs compliance.

Covers
  • Moped engines with displacement under 50cc
  • Small scooter engines (spark-ignition)
  • Motorized bicycle engines
  • Pocket bike engines
  • Small gasoline engines for children's ATVs
Also under 8407.31
  • Honda Ruckus engine
  • Piaggio Zip 50 engine
  • Yamaha Jog 50 engine
  • Kymco Agility 50 engine
  • SYM Fiddle II 50 engine

Codes often confused with 8407.31

Common mistake. The most common misclassification occurs with HS code 8407.32, which covers vehicle engines with a displacement between 50cc and 250cc. Even a minor measurement difference can change the classification. Another frequent error is using HS code 8408.20, which is for compression-ignition (diesel) engines used in vehicles. Additionally, electric motors for vehicles are classified under 8501 and should not be confused with internal combustion engines. Engines for non-vehicle use, such as lawnmowers, are classified under 8407.90.

8407.32Engines; reciprocating piston engines, of a kind used for the propulsion of vehicles of chapter 87, of a cylinder capacity exceeding 50cc but not exceeding 250cc8408.20Engines; compression-ignition internal combustion piston engines (diesel or semi-diesel engines), of a kind used for the propulsion of vehicles of chapter 8785.01Electric motors and generators (excluding generating sets)8407.90Engines; rotary internal combustion piston engines, for other than aircraft or marine propulsion

Top exporters and importers of HS 840731 (the code used for small vehicle engine), 2025

In 2025, the largest exporter of HS 840731 (the code used for small vehicle engine) in UN Comtrade data was China, with 55% of world exports; the largest importer in UN Comtrade data was Türkiye, with 39% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Figures cover everything classified under HS 840731, not only small vehicle engine.

Top exporters 2025 · share of world exports

  1. 1 China $43M
  2. 2 Vietnam* ~$17M
  3. 3 Italy $7.6M

World total: $78M Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 Türkiye $43M
  2. 2 Japan $23M
  3. 3 Vietnam* ~$17M

World total: $111M Reported figures on UN Comtrade ↗

How these figures are built

109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).

Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.

Brazil NCM codes for small vehicle engine

Brazil splits HS 8407.31 into 2 NCM codes. Pick the one that matches your product:

  • 8407.31.10Petrol vehicle engines, 1 cyl, max 50 cc
  • 8407.31.90Other petrol vehicle engines, max 50 cc

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.

Questions about small vehicle engine

What is the HS code for Small vehicle engine?

The HS code for Small vehicle engine is 840731 (Engines; reciprocating piston engines, of a kind used for the propulsion of vehicles of chapter 87, of a cylinder capacity not exceeding 50cc). The HS code for a spark-ignition reciprocating piston engine used for vehicle propulsion with a capacity not exceeding 50cc is 8407.31.

How do I classify Small vehicle engine for customs?

Small vehicle engine is classified under HS code 840731 — Engines; reciprocating piston engines, of a kind used for the propulsion of vehicles of chapter 87, of a cylinder capacity not exceeding 50cc. This is a 6-digit subheading level code.

Does this code include electric motors for small scooters?

No, electric motors are classified under heading 8501. HS code 8407.31 specifically applies to spark-ignition internal combustion engines.

Which countries are the top exporters of small vehicle engine (HS 840731)?

In 2025, the top exporters of HS 840731 (the code used for small vehicle engine) in UN Comtrade data were China ($43M, 55% of world exports), Vietnam (about $17M) and Italy ($7.6M). World exports came to about $78M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Which countries are the top importers of small vehicle engine (HS 840731)?

In 2025, the top importers of HS 840731 (the code used for small vehicle engine) in UN Comtrade data were Türkiye ($43M, 39% of world imports), Japan ($23M) and Vietnam (about $17M). World imports came to about $111M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Is the HS code for Small vehicle engine the same in all countries?

The base HS code 840731 for Small vehicle engine is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.

What is the NCM code for small vehicle engine in Brazil?

Brazil splits HS 840731 into 2 NCM codes, so the right one for small vehicle engine depends on the product's details: 8407.31.10 (Petrol vehicle engines, 1 cyl, max 50 cc), 8407.31.90 (Other petrol vehicle engines, max 50 cc).