Engine family AYYGC0.28BZU

What this record says

Sold in the US by

Yiying Motorcycle Inc.

Engine built by

Benzhou Vehicle Industry Group Co.,Ltd.

Vehicle category

Highway Motorcycle - II (170-279cc)

Certificate numbers

AYYGC0.28BZU-002

The engine, as described on the certificate

The test vehicle Yiying Motorcycle submitted for this family (model YY300T) carried engine code BZ173MN. In the Chinese engine-model convention that reads as one cylinder with a nominal 73 mm bore, MN series.

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 13.5 kW (about 18 hp) at 7,000 rpm, driving through a CVT (belt and variator).

Engine code on test vehicle

BZ173MN

Nominal bore (from the code)

73 mm

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

13.5 kW (≈18 hp)

Rated speed

7,000 rpm

Transmission

CVT (belt and variator)

Sales area

50S

Vehicle built by

Benzhou Vehicle Industry Group Co.,Ltd.

Test vehicle model

YY300T

Filing history and where it was sold

Yiying Motorcycle filed one certificate under this family, for model year 2010, sold as 50-state, California included.

The vehicle itself is recorded as built by the same company, Benzhou Vehicle Industry Group Co.,Ltd. in China — engine and chassis from one source.

Certified emission levels: CO 2.1, HC 0.8 g/km.

Other records carrying the same engine code

Yiying Motorcycle certified an engine with this code under 2 other family numbers — the same engine filed again in another year, or in an off-road and a street version:

• 9YYGC0.28BZU (2009)
• BYYGC0.28BZU (2011)

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 AYYGC0.28BZU

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.

Yiying YY250T · Yiying YY250T-2 · Yiying YY250T-2A · Yiying YY250T-4 · Yiying YY250T-4A · Yiying YY250T-5 · Yiying YY250T-5A · Yiying YY250T-6 · Yiying YY250T-6A · Yiying YY250T-8 · Yiying YY250T-8A · Yiying YY250T-A · Yiying YY300T · Yiying YY300T-2 · Yiying YY300T-3 · Yiying YY300T-4 · Yiying YY300T-5 · Yiying YY300T-6

Other American badges on engines from the same factory

• Benzhou Vehicle Industry Group Co.,Ltd. · 49-50cc4 American brands · 2007–2015