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The Scooter Parts Registry

EPA engine family

Engine family 8BNZC.050SA1

If this code is printed on your emission label, this is your machine's federal record: sold under Benzhou (Usa) Vehicle Industry Group Co., Ltd., with an engine built by Chongqing Loncin, certified as street-legal scooters and motorcycles.

Displacement
49cc
Model years
2008
Models certified
20
Certificates
1

What this record says

Sold in the US by
Benzhou (Usa) Vehicle Industry Group Co., Ltd.
Engine built by
Chongqing Loncin
Vehicle category
Highway Motorcycle - Ia (<50cc)
Certificate numbers
8BNZC.050SA1-001

What the number itself says

Reading 8BNZC.050SA1 left to right: 8 is the model-year letter for 2008, BNZ is the three-character code the EPA assigned to Benzhou (Usa) Vehicle Industry Group as certificate holder, C marks a highway (street-legal) certification, .050 is the displacement in litres, so 50cc and SA1 is Benzhou (Usa) Vehicle Industry Group'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 Benzhou (Usa) Vehicle Industry Group submitted for this family (model YY50QT) carried engine code 139QMB. 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 kW (about 3 hp) at 7,500 rpm, driving through an automatic.

Engine code on test vehicle
139QMB
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 kW (≈3 hp)
Rated speed
7,500 rpm
Transmission
automatic
Sales area
49S
Vehicle built by
Benzhou Vehicle Industry Group Co., Ltd.
Test vehicle model
YY50QT

Filing history and where it was sold

Benzhou (Usa) Vehicle Industry Group 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 Benzhou Vehicle Industry Group Co., Ltd. in China, while the engine came from Chongqing Loncin. Chassis parts and engine parts therefore have different origins.

Certified emission levels: CO 3.1, HC 0.25, NOx 0.62 g/km.

Other records carrying the same engine code

Other certificate holders whose test vehicle carried the same engine code (10 of 37 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 8BNZC.050SA1

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.

YY50QT · YY50QT-10 · YY50QT-11 · YY50QT-12 · YY50QT-13 · YY50QT-14 · YY50QT-15 · YY50QT-2 · YY50QT-20 · YY50QT-21 · YY50QT-22 · YY50QT-25 · YY50QT-26 · YY50QT-3 · YY50QT-4 · YY50QT-5 · YY50QT-6 · YY50QT-7 · YY50QT-8 · YY50QT-9

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.