Engine family 8ZXMX.250AMA

What this record says

Sold in the US by

Zxmco Usa, Inc.

Engine built by

Jiangsu Zhongxing Motorcycle Co., Ltd.

Vehicle category

ATVA-Meet EPA & ARB ATV Definition

Certificate numbers

8ZXMX.250AMA-001

What the number itself says

Reading 8ZXMX.250AMA left to right: 8 is the model-year letter for 2008, ZXM is the three-character code the EPA assigned to Zxmco Usa as certificate holder, X marks an off-road certification, .250 is the displacement in litres, so 250cc and AMA is Zxmco 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 vehicle Zxmco Usa submitted for this family (model ZXA250) carried engine code ZX167FMM. In the Chinese engine-model convention that reads as one cylinder with a nominal 67 mm bore, FMM series.

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 "TWC, single bed, open loop". The head carries a pulse secondary-air (PAIR) valve.

Rated power on the record is 11.5 kW (about 15 hp) at 6,500 rpm, driving through a 5-speed manual gearbox.

Engine code on test vehicle

ZX167FMM

Nominal bore (from the code)

67 mm

Cylinders / valves

1 · 2 per cylinder

Cycle

four-stroke

Fuel delivery

carburettor

Oxygen sensor

no

Engine control

ICM

Catalytic converter

TWC, single bed, open loop

Air injection

PAIR

Rated power

11.5 kW (≈15 hp)

Rated speed

6,500 rpm

Transmission

5-speed manual gearbox

Sales area

49S

Vehicle built by

Jiangsu Zhongxing Motorcycle Co., Ltd.

Test vehicle model

ZXA250

Filing history and where it was sold

Zxmco 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, Jiangsu Zhongxing Motorcycle Co., Ltd. in China — engine and chassis from one source.

Certified emission levels: CO 23.9, HC 0.66, NOx 0.04 g/km.

Models certified under 8ZXMX.250AMA

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.

ZXA200 · ZXA200-13 · ZXA200-14 · ZXA200-2 · ZXA200-2A · ZXA200-2B · ZXA200-2C · ZXA200-2D · ZXA200-5 · ZXA200-5A · ZXA200-5B · ZXA200-6 · ZXA200-6A · ZXA200-8 · ZXA250 · ZXA250-2 · ZXA250-2A · ZXA250-2B · ZXA250-2C · ZXA250-5 · ZXA250-5A · ZXA250-8 · ZXA250-8A · ZXA250-8B