EPA engine family

Engine family DSHKC.049SC1

If this code is printed on your emission label, this is your machine's federal record: sold under Shenke Usa, Inc., with an engine built by Zhejiang Jonway Motorcycle Manufacturing Co.,Ltd, certified as street-legal scooters and motorcycles.

Displacement: 49cc
Model years: 2013
Models certified: 15
Certificates: 1

What this record says

Sold in the US by: Shenke Usa, Inc.
Engine built by: Zhejiang Jonway Motorcycle Manufacturing Co.,Ltd
Vehicle category: Highway Motorcycle - Ia (<50cc)
Certificate numbers: DSHKC.049SC1-001

What the number itself says

Reading DSHKC.049SC1 left to right: D is the model-year letter for 2013, SHK is the three-character code the EPA assigned to Shenke Usa as certificate holder, C marks a highway (street-legal) certification, .049 is the displacement in litres, so 49cc and SC1 is Shenke 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 "Three Way Catalyst (TWC), single-bed, closed-loop warm up". The head carries a pulse secondary-air (PAIR) valve.

Rated power on the record is 2.4 kW (about 3 hp) at 7,500 rpm, driving through a 4-speed manual gearbox.

Cylinders / valves: 1 · 2 per cylinder
Cycle: four-stroke
Fuel delivery: carburettor
Oxygen sensor: no
Engine control: ICM
Catalytic converter: Three Way Catalyst (TWC), single-bed, closed-loop warm up
Air injection: PAIR
Rated power: 2.4 kW (≈3 hp)
Rated speed: 7,500 rpm
Transmission: 4-speed manual gearbox
Sales area: 49S
Vehicle built by: Zhejiang Jonway Motorcycle Manufacturing Co.,Ltd
Test vehicle model: YY50QT-6

Filing history and where it was sold

Shenke Usa filed one certificate under this family, for model year 2013, sold as 49-state (not certified for sale in California).

The vehicle itself is recorded as built by the same company, Zhejiang Jonway Motorcycle Manufacturing Co.,Ltd in China — engine and chassis from one source.

Certified emission levels: CO 7.5, HC 0.3, NOx 0.5 g/km.

What this configuration means when you shop for parts

Shenke Usa certified this 49cc engine with a carburettor at 49cc, 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 49cc engine before ordering.

Shenke Usa's 2013 this 49cc engine drives a manual gearbox, so clutch plates, chain and sprockets wear first — count the sprocket teeth on the YY50QT-6 before buying a chain.

The PAIR valve Shenke Usa lists on this 49cc engine is an emissions part; its hoses perish and are the usual cause of popping on the overrun.

The exhaust on Shenke Usa's DSHKC.049SC1 carries a catalyst, so a replacement silencer without one changes what this 49cc engine was certified with.

Models certified under DSHKC.049SC1

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.

YY50QT-10 · YY50QT-12 · YY50QT-16 · YY50QT-18 · YY50QT-21 · YY50QT-22 · YY50QT-28 · YY50QT-29 · YY50QT-3 · YY50QT-30 · YY50QT-4 · YY50QT-5 · YY50QT-6 · YY50QT-7 · YY50QT-8

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.