Engine family 8ZTWC.050SAA

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

8ZTWC.050SAA-001

What the number itself says

Reading 8ZTWC.050SAA left to right: 8 is the model-year letter for 2008, 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 test vehicles Zhejiang Taizhou Wangye Power (Usa) submitted for this family carried engine codes 139QMB and 157QMJ. In the Chinese engine-model convention that reads as one cylinder with a nominal 39 mm bore, QMB series. Against the certified 49cc that implies a stroke of roughly 41 mm — a sanity check for a piston or cylinder listing, not a published figure.

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.

Engine code on test vehicle

139QMB, 157QMJ

Nominal bore (from the code)

39 mm · implied stroke ≈ 41 mm

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

WY150T-3

Filing history and where it was sold

Zhejiang Taizhou Wangye Power (Usa) filed one certificate under this family, for model year 2008, 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.

Other records carrying the same engine code

Zhejiang Taizhou Wangye Power (Usa) certified an engine with this code under one other family number — the same engine filed again in another year, or in an off-road and a street version:

• 8ZTWC.150SAA (2008)

Other certificate holders whose test vehicle carried the same engine code (10 of 87 shown):

• Wangye USA Co., LLCFWGYC.049WYC2015 · same engine factory
• Wangye USA Co., LLCHWGYC0.15S4A2017 · same engine factory
• Wangye USA Co., LLCFWGYC0.15S4A2015 · same engine factory
• Xracer Sports Company Limited8XCRX.150AAA2008 · same engine factory
• Benyate Motorsport LLCTBYMC.049MC12026 · different engine factory
• Benyate Motorsport LLCSBYMC.049MC12025 · different engine factory
• Benyate Motorsport LLCRBYMC.049MC12024 · different engine factory
• Benyate Motorsport LLCPBYMC.049MC12023 · different engine factory
• Benyate Motorsport LLCNBYMC.049MC12022 · different engine factory
• Benzhou (Usa) Vehicle Industry Group Co., Ltd.8BNZC.050SA12008 · different engine factory

A shared code from the same factory is a strong search lead. From a different factory it is as often a naming coincidence. Either way it narrows the search; it does not settle it — measure before you buy.

Models certified under 8ZTWC.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

• Zhejiang Taizhou Wangye Power · 49-50cc3 American brands · 2007–2015