EPA engine family

Engine family 7CHRX.110ATV

If this code is printed on your emission label, this is your machine's federal record: sold under Charming Motorcycle USA Inc., with an engine built by Chongqing Loncin, certified as ATVs.

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

What this record says

Sold in the US by: Charming Motorcycle USA Inc.
Engine built by: Chongqing Loncin
Vehicle category: ATVA-Meet EPA & ARB ATV Definition
Certificate numbers: 7CHRX.110ATV-001-R01

What the number itself says

Reading 7CHRX.110ATV left to right: 7 is the model-year letter for 2007, CHR is the three-character code the EPA assigned to Charming Motorcycle USA as certificate holder, X marks an off-road certification, .110 is the displacement in litres, so 110cc and ATV is Charming Motorcycle 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 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 5.2 kW (about 7 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: 5.2 kW (≈7 hp)
Rated speed: 7,500 rpm
Transmission: 3-speed manual gearbox
Sales area: 50S
Vehicle built by: Chongqing Chang Ming Vehicle Manufacture Co. Ltd
Test vehicle model: CM110ST

Filing history and where it was sold

Charming Motorcycle USA filed one certificate under this family, for model year 2007, sold as 50-state, California included.

The vehicle itself is recorded as built by the same company, Chongqing Chang Ming Vehicle Manufacture Co. Ltd in China — engine and chassis from one source.

Certified emission levels: CO 11, HC+NOx 0.4 g/km.

What this configuration means when you shop for parts

Charming Motorcycle USA 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.

Charming Motorcycle USA's 2007 this engine drives a manual gearbox, so clutch plates, chain and sprockets wear first — count the sprocket teeth on the CM110ST before buying a chain.

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

The exhaust on Charming Motorcycle USA's 7CHRX.110ATV carries a catalyst, so a replacement silencer without one changes what this engine was certified with.

Models certified under 7CHRX.110ATV

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.

BMX110ST · BMX70ST · BMX90ST · CM110ST · CM70ST · CM90ST · PD110ST · PD70ST · PD90ST · VLI110ST · VLI70ST · VLI90ST · WF110ST · WF70ST · WF90ST

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.