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The Scooter Parts Registry

EPA engine family

Engine family PWMIC.049TYA

If this code is printed on your emission label, this is your machine's federal record: sold under Wansen Motor Inc., with an engine built by Taizhou Xinba Power Manufacturing Co., Ltd, certified as street-legal scooters and motorcycles.

Displacement
49.3cc
Model years
2023
Models certified
15
Certificates
1

What this record says

Sold in the US by
Wansen Motor Inc.
Engine built by
Taizhou Xinba Power Manufacturing Co., Ltd.
Vehicle category
Highway Motorcycle - Ia (<50cc)
Certificate numbers
PWMIC.049TYA-001

What the number itself says

Reading PWMIC.049TYA left to right: P is the model-year letter for 2023, WMI is the three-character code the EPA assigned to Wansen Motor as certificate holder, C marks a highway (street-legal) certification, .049 is the displacement in litres, so 49cc and TYA is Wansen Motor'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 vehicle Wansen Motor submitted for this family (model TY50QT-L) carried engine code 1P39QMB. In the Chinese engine-model convention that reads as one cylinder, horizontal (flat) cylinder, with a nominal 39 mm bore, QMB series. Against the certified 49.3cc 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. 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 1.8 kW (about 2 hp) at 7,000 rpm, driving through an automatic.

Engine code on test vehicle
1P39QMB
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
other
Catalytic converter
TWC, single bed, open loop
Air injection
PAIR
Rated power
1.8 kW (≈2 hp)
Rated speed
7,000 rpm
Transmission
automatic
Sales area
50S
Vehicle built by
Zhejiang Shanqi Tianying Vehicle Industry Co., Ltd.
Test vehicle model
TY50QT-L

Filing history and where it was sold

Wansen Motor filed one certificate under this family, for model year 2023, sold as 50-state, California included.

The vehicle itself is recorded as built by Zhejiang Shanqi Tianying Vehicle Industry Co., Ltd. in China, while the engine came from Taizhou Xinba Power Manufacturing Co., Ltd. Chassis parts and engine parts therefore have different origins.

Certified emission levels: CO 2.0, HC 0.2 g/km.

Other records carrying the same engine code

Wansen Motor certified an engine with this code under 4 other family numbers — the same engine filed again in another year, or in an off-road and a street version:

  • KWMIC.049TYA (2019)
  • LWMIC.049TYA (2020)
  • MWMIC.049TYA (2021)
  • NWMIC.049TYA (2022)

Other certificate holders whose test vehicle carried the same engine code (10 of 57 shown):

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 PWMIC.049TYA

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.

EXPRESS-50 · ROMEO-50 · SUPER-50 · TY50QT-6 · TY50QT-7 · TY50QT-8 · TY50QT-9 · TY50QT-A · TY50QT-B · TY50QT-F · TY50QT-K · TY50QT-L · TY50SRT · TY50STT · TY50SVT

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.