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The Scooter Parts Registry

EPA engine family

Engine family SMCIX.391ATA

If this code is printed on your emission label, this is your machine's federal record: sold under Mars Carts Inc., with an engine built by Taizhou Nebula Power Co., Ltd, certified as ATVs.

Displacement
—
Model years
2025
Models certified
17
Certificates
1

What this record says

Sold in the US by
Mars Carts Inc.
Engine built by
Taizhou Nebula Power Co., Ltd
Vehicle category
ATVB-Meeting EPA ATV Definition
Certificate numbers
SMCIX.391ATA-003

What the number itself says

Reading SMCIX.391ATA left to right: S is the model-year letter for 2025, MCI is the three-character code the EPA assigned to Mars Carts as certificate holder, X marks an off-road certification, .391 is the displacement in litres, so 391cc and ATA is Mars Carts' 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 Mars Carts submitted for this family (model XY450U-B) carried engine code XY182MQ. In the Chinese engine-model convention that reads as one cylinder with a nominal 82 mm bore, MQ series.

The certificate describes a four-stroke, single-cylinder engine with 2 valves per cylinder fed by sequential multi-port fuel injection, with an oxygen sensor for closed-loop fuelling, run by an ignition control module (CDI-type ignition). There is a catalytic converter in the exhaust, recorded as "Three Way Catalyst (TWC), single-bed, closed-loop warm up".

Rated power on the record is 19 kW (about 25 hp) at 6,500 rpm, driving through a CVT (belt and variator).

Engine code on test vehicle
XY182MQ
Nominal bore (from the code)
82 mm
Cylinders / valves
1 · 2 per cylinder
Cycle
four-stroke
Fuel delivery
sequential multi-port fuel injection
Oxygen sensor
yes (closed loop)
Engine control
ICM
Catalytic converter
Three Way Catalyst (TWC), single-bed, closed-loop warm up
Rated power
19 kW (≈25 hp)
Rated speed
6,500 rpm
Transmission
CVT (belt and variator)
Sales area
49S
Vehicle built by
Taizhou Nebula Power Co., Ltd
Test vehicle model
XY450U-B

Filing history and where it was sold

Mars Carts filed one certificate under this family, for model year 2025, sold as 49-state (not certified for sale in California).

The vehicle itself is recorded as built by the same company, Taizhou Nebula Power Co., Ltd in China — engine and chassis from one source.

Certified emission levels: CO 5, HC+NOx 0.6 g/km.

Other records carrying the same engine code

Mars Carts certified an engine with this code under 7 other family numbers — the same engine filed again in another year, or in an off-road and a street version:

Other certificate holders whose test vehicle carried the same engine code:

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 SMCIX.391ATA

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.

Bighorn 380 · Bighorn 400 · Bison 400 · Bison 400L · Bison 400U · Eagle 400 · SRU400U · SRU400U XL · Taurus 4 450 G · Taurus 4 450 U · Taurus 450 G · Taurus 450 U · XY380U-A · XY380U-B · XY450U-A · XY450U-B · XY450U-C

Other American badges on engines from the same factory

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.