EPA engine family

Engine family 7YGGX.125DM3

If this code is printed on your emission label, this is your machine's federal record: sold under Yongjiang Motors, Inc., with an engine built by Chongqing Loncin, certified as off-road machines.

Displacement: —
Model years: 2007
Models certified: 15
Certificates: 1

What this record says

Sold in the US by: Yongjiang Motors, Inc.
Engine built by: Chongqing Loncin
Vehicle category: Off-Road Motorcycle
Certificate numbers: 7YGGX.125DM3-001

What the number itself says

Reading 7YGGX.125DM3 left to right: 7 is the model-year letter for 2007, YGG is the three-character code the EPA assigned to Yongjiang Motors as certificate holder, X marks an off-road certification, .125 is the displacement in litres, so 125cc and DM3 is Yongjiang Motors' 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 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 5.6 kW (about 8 hp) at 7,500 rpm, driving through a 3-speed manual gearbox.

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: 5.6 kW (≈8 hp)
Rated speed: 7,500 rpm
Transmission: 3-speed manual gearbox
Sales area: 50S
Vehicle built by: Zhejiang Yongjiang Industrial Co., Ltd.
Test vehicle model: YJI125

Filing history and where it was sold

Yongjiang Motors filed one certificate under this family, for model year 2007, sold as 50-state, California included.

The vehicle itself is recorded as built by Zhejiang Yongjiang Industrial Co., Ltd. in China, while the engine came from Chongqing Loncin. Chassis parts and engine parts therefore have different origins.

Certified emission levels: CO 3.4, HC 0.37, NOx 0.01 g/km.

What this configuration means when you shop for parts

Yongjiang Motors 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.

Yongjiang Motors' 2007 this engine drives a manual gearbox, so clutch plates, chain and sprockets wear first — count the sprocket teeth on the YJI125 before buying a chain.

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

The exhaust on Yongjiang Motors' 7YGGX.125DM3 carries a catalyst, so a replacement silencer without one changes what this engine was certified with.

Models certified under 7YGGX.125DM3

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.

O2S110 · O2S125 · O2S90 · ODS110 · ODS125 · ODS90 · SSR110 · SSR125 · SSR90 · YJI110 · YJI125 · YJI90 · ZTX110 · ZTX125 · ZTX90

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.