Shared-engine cohort
Taizhou Zhongneng (ZNEN) 250cc: the American badges sharing this engine
3 American brands certified 250cc machines built by Taizhou Zhongneng (ZNEN) between 2009–2011 — street-legal scooters and motorcycles. These are the machines most likely to share components with yours.
- American badges
- 3
- Model years
- 2009–2011
- Exact displacements
- 244cc
- Engine families
- 7
Every badge in this cohort
| American brand | Years in this cohort | Models certified |
|---|---|---|
| Amstar Motors LLC | 2009–2011 | 346 |
| Chironex Inc. | 2010–2011 | 22 |
| Puma Cycles Corporation | 2009–2010 | 85 |
The strongest matches: same factory, same size, same year
In these model years, two or more American brands certified 250cc machines from Taizhou Zhongneng (ZNEN) simultaneously. Machines built alongside each other are the most likely to share components — though still not guaranteed to.
| Model year | Brands certified that year |
|---|---|
| 2011 | Amstar Motors LLC · Chironex Inc. |
| 2010 | Amstar Motors LLC · Chironex Inc. · Puma Cycles Corporation |
| 2009 | Amstar Motors LLC · Puma Cycles Corporation |
Related in the registry
Source. US EPA annual certification data — EPA Certified Highway Motorcycle Test Results, MY2006-present; EPA Certified Off-Road Motorcycle / ATV / UTV / Rec Vehicle, MY2006-present. Retrieved 2026-09-07. Full provenance and method.