Parts for use with spark-ignition internal combustion piston engines (including rotary engines), not elsewhere specified

US trade by year

US imports were $7.59B in the 12 months to Aug 2026, up 17% on the 12 months to Aug 2017. US exports were $3.42B, down 12%. In January 2022 the HS 2022 revision moved some goods between this code and 8549.21, 8549.29, 8549.31 and 3 more, so part of a change across the dashed line can be the revision. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

• Mexico
• Japan
• China
• Canada
• All countries

Who supplies the US

August 2026. Small figures under each value are the change from August 2025. Average prices aren't shown because this product's lines are counted in different units.

The 3 largest suppliers had 71.8% of US imports over the last 12 months.

How the market is shifting

Mexico gained the most share: 43.2% of US imports over the last 12 months, up from 40.9% in the 12 months before. Japan lost the most: 19.7%, down from 21.5%. The charts show September 2024 to August 2026 for the 4 largest suppliers over the last 12 months. Dotted lines mark lasting changes in duty paid, labelled with the supplier, or "Duty" when several moved; the tariff timeline lists each one with its notices.

• Mexico
• Japan
• China
• Canada
• All countries

Tariff actions touching this product

When the duty paid on this product changed and stayed changed, for its main suppliers and all countries, newest first, with the Federal Register notices that named the product in the 3 months before. Rates are medians of the 4 months either side, less any usual seasonal swing. A change shows what happened to duty paid, not why; read each notice for what it did.

1. January 2026 · Duty paid: Mexico 11.1% → 4.0%, Japan 37.4% → 11.5%, China 62.3% → 39.1%, Canada 9.8% → 4.0%, all countries 23.6% → 12.2%.
2. August 2025 · Duty paid: Mexico 4.9% → 12.2%, Japan 12.1% → 37.4%, Canada 3.1% → 10.2%, all countries 12.5% → 23.6%.
   • Adoption and Procedures of the Section 232 Steel and Aluminum Tariff Inclusions ProcessAug 19, 2025 · Bureau of Industry and Security
   • Certain Vertical Shaft Engines Between 99cc and 225cc, and Parts Thereof, From the People's Republic of China: Initiation of Circumvention Inquiry on the Antidumping and Countervailing Duty OrdersJul 11, 2025 · International Trade Administration
   • Imports of Automobiles, Automobile Parts, Civil Aircraft and Civil Aircraft Parts From the United Kingdom Under Executive Order 14309Jun 30, 2025 · International Trade Administration
3. March 2025 · Duty paid: Japan 2.5% → 8.7%, China 27.3% → 65.5%, all countries 4.2% → 12.1%.
4. January 2021 · Duty paid: China 20.4% → 25.8%.
   • Certain Vertical Shaft Engines Between 225cc and 999cc, and Parts Thereof From the People's Republic of China: Final Affirmative Determination of Sales at Less Than Fair Value and Final Affirmative Critical Circumstances DeterminationJan 11, 2021 · International Trade Administration
   • Certain Vertical Shaft Engines Between 225cc and 999cc, and Parts Thereof From the People's Republic of China: Final Affirmative Countervailing Duty Determination and Final Negative Critical Circumstances DeterminationJan 11, 2021 · International Trade Administration
   • Small Vertical Shaft Engines From China; Scheduling of the Final Phase of Countervailing and Antidumping Duty InvestigationsNov 27, 2020 · International Trade Commission
5. June 2019 · Duty paid: China 10.8% → 21.7%.
6. October 2018 · Duty paid: China 2.4% → 11.4%.
   • Request for Comments Concerning Proposed Modification of Action Pursuant to Section 301: China's Acts, Policies, and Practices Related to Technology Transfer, Intellectual Property, and InnovationJul 17, 2018 · Office of the US Trade Representative

Federal Register notices from the last 12 months that list this product's tariff codes. A notice can add a duty, exclude products from one or only mention them, so read each for what it changes. Search the Federal Register for 8409.91

• Certain Small Vertical Shaft Engines Between 99cc and up to 225cc, and Parts Thereof From the People's Republic of China: Continuation of Antidumping and Countervailing Duty OrdersOct 26, 2026 · International Trade Administration
• Certain Large Vertical Shaft Engines Between 225cc and 999cc, and Parts Thereof From the People's Republic of China: Continuation of Antidumping Duty Order and Countervailing Duty OrderAug 20, 2026 · International Trade Administration

Markets abroad

Each country's own import figures for this product, from UN Comtrade: the 8 biggest importers outside the US in the latest year each has reported, what they bought from the US, and the change from the year before. Values usually include freight and insurance to the importer's border, so they run a little above US export figures. Countries report a year or more late; 124 have reported 2025 so far.

The biggest market outside the US is Mexico, which imported $2.98B of this product in 2025, 43.8% of that from the US.

The US supplies 43.8% of imports into Mexico and 57.6% into Canada, but under 10% into Germany, China and Poland.

Of these, imports into Canada grew fastest: up 13% from 2024 to 2025.

Related products

Other products under heading 8409: parts for spark-ignition reciprocating or rotary internal combustion piston engines and compression-ignition internal combustion piston engines. US trade over the 12 months to August 2026.