EPA engine family

Engine family SFMAC.049MCA

If this code is printed on your emission label, this is your machine's federal record: sold under Flywing Motor American Co.,Ltd, with an engine built by Juneng Motorcycle, certified as street-legal scooters and motorcycles.

Displacement: 49cc
Model years: 2025
Models certified: 24
Certificates: 1

What this record says

Sold in the US by: Flywing Motor American Co.,Ltd
Engine built by: Juneng Motorcycle
Vehicle category: Highway Motorcycle - Ia (<50cc)
Certificate numbers: SFMAC.049MCA-003

What the number itself says

Reading SFMAC.049MCA left to right: S is the model-year letter for 2025, FMA is the three-character code the EPA assigned to Flywing Motor American as certificate holder, C marks a highway (street-legal) certification, .049 is the displacement in litres, so 49cc and MCA is Flywing Motor American'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 test vehicle Flywing Motor American submitted for this family (model JN50QT-24A) carried engine code JJ1P39QMB. In the Chinese engine-model convention that reads as one cylinder, horizontal (flat) cylinder, with a nominal 39 mm bore, QMB series. Against the certified 49cc that implies a stroke of roughly 41 mm — a sanity check for a piston or cylinder listing, not a published figure.

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 2.2 kW (about 3 hp) at 8,000 rpm, driving through a CVT (belt and variator).

Engine code on test vehicle: JJ1P39QMB
Nominal bore (from the code): 39 mm · implied stroke ≈ 41 mm
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: 2.2 kW (≈3 hp)
Rated speed: 8,000 rpm
Transmission: CVT (belt and variator)
Sales area: 49S
Vehicle built by: Juneng Motorcycle Technology Co., Ltd.
Test vehicle model: JN50QT-24A

Filing history and where it was sold

Flywing Motor American 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, Juneng Motorcycle Technology Co., Ltd. in China — engine and chassis from one source.

Certified emission levels: CO 7.0, HC 0.6 g/km.

What this configuration means when you shop for parts

Flywing Motor American certified the JJ1P39QMB 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 39 mm bore in the code gives the engine size, not the carburettor size — measure the intake bore and the mounting on the JJ1P39QMB before ordering.

The CVT behind the JJ1P39QMB makes its drive belt, variator rollers and clutch shoes the consumables; belt length and width vary between 49cc machines, so measure the old belt on the JN50QT-24A rather than ordering by displacement.

The PAIR valve Flywing Motor American lists on the JJ1P39QMB is an emissions part; its hoses perish and are the usual cause of popping on the overrun.

The exhaust on Flywing Motor American's SFMAC.049MCA carries a catalyst, so a replacement silencer without one changes what the JJ1P39QMB was certified with.

Other records carrying the same engine code

Flywing Motor American certified an engine with this code under one other family number — the same engine filed again in another year, or in an off-road and a street version:

TFMAC.049MCA (2026)

Other certificate holders whose test vehicle carried the same engine code (10 of 12 shown):

Jiajue U.S.A. LLCTJAJC.049S4B2026 · different engine factory
Jiajue U.S.A. LLCSJAJC.049S4B2025 · different engine factory
Jiajue U.S.A. LLCRJAJC.049S4B2024 · different engine factory
Jiajue U.S.A. LLCPJAJC.049S4B2023 · different engine factory
Jiajue U.S.A. LLCNJAJC.049S4B2022 · different engine factory
Jiajue U.S.A. LLCMJAJC.049S4B2021 · different engine factory
Jiajue U.S.A. LLCLJAJC.049S4B2020 · different engine factory
Jiajue U.S.A. LLCKJAJC.049S4B2019 · different engine factory
Jiajue U.S.A. LLCJJAJC.049S4A2018 · different engine factory
Jiajue U.S.A. LLCHJAJC.049S4A2017 · different engine factory

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 SFMAC.049MCA

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.

Arron · Arron naked · Blanche IV · Cappucino · Cappucino S+ · Cappucino V · Eurostar 50 · Hurpben · Hurpben III · Hurpben S · JOC · Jog II · Jog III · Mirage · Modstar 50 · Mojito S · Mojito S+ · Racestar 50 · Retrostar 50 · Shiny · Sorano · Speedo · Vanilla · Versilia

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.