EPA engine family

Engine family BESYX.150STA

If this code is printed on your emission label, this is your machine's federal record: sold under Easy Vehicle, Inc., with an engine built by Zhejiang Easy Vehicle Co.,Ltd, certified as ATVs.

Displacement: 150cc
Model years: 2011
Models certified: 15
Certificates: 1

What this record says

Sold in the US by: Easy Vehicle, Inc.
Engine built by: Zhejiang Easy Vehicle Co.,Ltd
Vehicle category: ATVA-Meet EPA & ARB ATV Definition
Certificate numbers: BESYX.150STA-001

What the number itself says

Reading BESYX.150STA left to right: B is the model-year letter for 2011, ESY is the three-character code the EPA assigned to Easy Vehicle as certificate holder, X marks an off-road certification, .150 is the displacement in litres, so 150cc and STA is Easy Vehicle'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. 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 5.9 kW (about 8 hp) at 7,000 rpm, driving through a CVT (belt and variator).

Cylinders / valves: 1 · 2 per cylinder
Cycle: four-stroke
Fuel delivery: carburettor
Oxygen sensor: no
Engine control: other
Catalytic converter: TWC, single bed, open loop
Air injection: PAIR
Rated power: 5.9 kW (≈8 hp)
Rated speed: 7,000 rpm
Transmission: CVT (belt and variator)
Sales area: 50S
Vehicle built by: ZHEJIANG EASY VEHICLE CO.,LTD
Test vehicle model: GB150

Filing history and where it was sold

Easy Vehicle filed one certificate under this family, for model year 2011, sold as 50-state, California included.

The vehicle itself is recorded as built by the same company, ZHEJIANG EASY VEHICLE CO.,LTD in China — engine and chassis from one source.

Certified emission levels: CO 4.8, HC+NOx 1.5 g/km.

What this configuration means when you shop for parts

Easy Vehicle certified this 150cc engine with a carburettor at 150cc, 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 150cc engine before ordering.

The CVT behind this 150cc engine makes its drive belt, variator rollers and clutch shoes the consumables; belt length and width vary between 150cc machines, so measure the old belt on the GB150 rather than ordering by displacement.

The PAIR valve Easy Vehicle lists on this 150cc engine is an emissions part; its hoses perish and are the usual cause of popping on the overrun.

The exhaust on Easy Vehicle's BESYX.150STA carries a catalyst, so a replacement silencer without one changes what this 150cc engine was certified with.

Models certified under BESYX.150STA

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.

GB150 · GE150 · GF150 · GH150 · GK150 · SA150 · SB150 · SC150 · SE150 · SF150 · SG150 · SH150 · SL150 · SM150 · TE150

Other American badges on engines from the same factory

Zhejiang Easy Vehicle Co.,Ltd · 150cc2 American brands · 2011–2014

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.