EPA engine family
Engine family 6YGGX.125DYJ
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
- 2006
- 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
- 6YGGX.125DYJ-001
What the number itself says
Reading 6YGGX.125DYJ left to right: 6 is the model-year letter for 2006, 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 DYJ 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.
- 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
- 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 2006, 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 3.5, HC+NOx 0.4 g/km.
Models certified under 6YGGX.125DYJ
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.
O2S125 · O2S90 · ODS110 · ODS125 · ODS90 · OS2110 · 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.