Skip to content

We don't sell parts. We tell you what you actually own, and how to check what fits.

The Scooter Parts Registry

EPA engine family

Engine family RMCIX.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
2024
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
RMCIX.391ATA-005

What the number itself says

Reading RMCIX.391ATA left to right: R is the model-year letter for 2024, 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 2024, 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 RMCIX.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.