EPA engine family

Engine family CWGYC0.15S4A

If this code is printed on your emission label, this is your machine's federal record: sold under Wangye USA Co., LLC, with an engine built by Zhejiang Taizhou Wangye Power, certified as street-legal scooters and motorcycles.

Displacement: —
Model years: 2012
Models certified: 37
Certificates: 1

What this record says

Sold in the US by: Wangye USA Co., LLC
Engine built by: Zhejiang Taizhou Wangye Power
Vehicle category: Highway Motorcycle - Ib (50-169cc)
Certificate numbers: CWGYC0.15S4A-002

The engine, as described on the certificate

The certificate describes a four-stroke, single-cylinder engine with 2 valves per cylinder fed by carburettor. There is a catalytic converter in the exhaust, recorded as "TWC, single bed, open loop". The head carries a pulse secondary-air (PAIR) valve.

Rated power on the record is 5.9 kW (about 8 hp) at 7,000 rpm, driving through a CVT (belt and variator).

Cylinders / valves: 1 · 2 per cylinder
Cycle: four-stroke
Fuel delivery: carburettor
Oxygen sensor: no
Catalytic converter: TWC, single bed, open loop
Air injection: PAIR
Rated power: 5.9 kW (≈8 hp)
Rated speed: 7,000 rpm
Transmission: CVT (belt and variator)
Sales area: 50S
Vehicle built by: Zhejiang Taizhou Wangye Power Co.,Ltd.
Test vehicle model: WY150T-3

Filing history and where it was sold

Wangye USA Co. filed one certificate under this family, for model year 2012, sold as 50-state, California included.

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 5.4, HC 0.6 g/km.

What this configuration means when you shop for parts

Wangye USA Co. certified this engine with a carburettor, so the fuel-side wear items are the carburettor, its jets and float needle, the intake boot and the choke. The record gives no carburettor part number — measure the intake bore and the mounting on this engine before ordering.

The CVT behind this engine makes its drive belt, variator rollers and clutch shoes the consumables, so measure the old belt on the WY150T-3 rather than ordering by displacement.

The PAIR valve Wangye USA Co. lists on this engine is an emissions part; its hoses perish and are the usual cause of popping on the overrun.

The exhaust on Wangye USA Co.'s CWGYC0.15S4A carries a catalyst, so a replacement silencer without one changes what this engine was certified with.

Models certified under CWGYC0.15S4A

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.

WY125T-101 · WY125T-11 · WY125T-12 · WY125T-21 · WY125T-21(II) · WY125T-21(III) · WY125T-23(VI) · WY125T-23(VII) · WY125T-30 · WY125T-65 · WY125T-74 · WY125T-75 · WY125T-77 · WY125T-9 · WY125T-95 · WY150T-16 · WY150T-18 · WY150T-20 · WY150T-20(II) · WY150T-20(III) · WY150T-21 · WY150T-3 · WY150T-3(I) · WY150T-3(VI) · WY150T-3(VII) · WY150T-33 · WY150T-36 · WY150T-37 · WY150T-38 · WY150T-39 · WY150T-41 · WY150T-44 · WY150T-45 · WY150T-46 · WY150T-5 · WY150T-56 · WY150T-58

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.