EPA engine family
Engine family 9ZTWC.050SAA
If this code is printed on your emission label, this is your machine's federal record: sold under Zhejiang Taizhou Wangye Power (Usa) Co., Ltd., with an engine built by Zhejiang Taizhou Wangye Power, certified as street-legal scooters and motorcycles.
- Displacement
- 49cc
- Model years
- 2009
- Models certified
- 20
- Certificates
- 1
What this record says
- Sold in the US by
- Zhejiang Taizhou Wangye Power (Usa) Co., Ltd.
- Engine built by
- Zhejiang Taizhou Wangye Power
- Vehicle category
- Highway Motorcycle - Ia (<50cc)
- Certificate numbers
- 9ZTWC.050SAA-002
What the number itself says
Reading 9ZTWC.050SAA left to right: 9 is the model-year letter for 2009, ZTW is the three-character code the EPA assigned to Zhejiang Taizhou Wangye Power (Usa) as certificate holder, C marks a highway (street-legal) certification, .050 is the displacement in litres, so 50cc and SAA is Zhejiang Taizhou Wangye Power (Usa)'s own sequence for that year. Nothing in the number names the factory — that comes from the certificate itself.
The engine, as described on the certificate
The certificate describes a four-stroke, single-cylinder engine with 2 valves per cylinder fed by carburettor, run by an ignition control module (CDI-type ignition). There is a catalytic converter in the exhaust, recorded as "oxidizing catalyst only". The head carries a pulse secondary-air (PAIR) valve.
Rated power on the record is 2.2–5.9 kW (about 3–8 hp) at 7,000 rpm, driving through an automatic.
- Cylinders / valves
- 1 · 2 per cylinder
- Cycle
- four-stroke
- Fuel delivery
- carburettor
- Oxygen sensor
- no
- Engine control
- ICM
- Catalytic converter
- oxidizing catalyst only
- Air injection
- PAIR
- Rated power
- 2.2–5.9 kW
- Rated speed
- 7,000 rpm
- Transmission
- automatic
- Sales area
- 49S
- Vehicle built by
- Zhejiang Taizhou Wangye Power Co., Ltd.
- Test vehicle model
- WY50QT
Filing history and where it was sold
Zhejiang Taizhou Wangye Power (Usa) filed one certificate under this family, for model year 2009, sold as 49-state (not certified for sale in California).
The vehicle itself is recorded as built by the same company, Zhejiang Taizhou Wangye Power Co., Ltd. in China — engine and chassis from one source.
Certified emission levels: CO 0.8, HC 0.16, NOx 0.34 g/km.
Models certified under 9ZTWC.050SAA
Every model designation the importer listed on this certificate. If your machine's model name appears here, this is the right record — even if the name on the bodywork is slightly different.
WY50QT · WY50QT-10 · WY50QT-11 · WY50QT-16 · WY50QT-20 · WY50QT-28 · WY50QT-30 · WY50QT-36 · WY50QT-37 · WY50QT-4 · WY50QT-40 · WY50QT-41 · WY50QT-42 · WY50QT-43 · WY50QT-44 · WY50QT-45 · WY50QT-5 · WY50QT-6 · WY50QT-7 · WY50QT-8
Other American badges on engines from the same factory
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.