Engine family TSSTC.049MCA

What this record says

Sold in the US by

Scooterstar Motors LLC

Engine built by

Zhejiang Xinba Technology Co.,Ltd.

Vehicle category

Highway Motorcycle - Ia (<50cc)

Certificate numbers

TSSTC.049MCA-001

What the number itself says

Reading TSSTC.049MCA left to right: T is the model-year letter for 2026, SST is the three-character code the EPA assigned to Scooterstar Motors as certificate holder, C marks a highway (street-legal) certification, .049 is the displacement in litres, so 49cc and MCA is Scooterstar Motors' 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 Scooterstar Motors submitted for this family (model HUNTER-4) carried engine code 1P39QMA-2. In the Chinese engine-model convention that reads as one cylinder, horizontal (flat) cylinder, with a nominal 39 mm bore, QMA 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 2.1 kW (about 3 hp) at 8,000 rpm, driving through a CVT (belt and variator).

Engine code on test vehicle

1P39QMA-2

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

2.1 kW (≈3 hp)

Rated speed

8,000 rpm

Transmission

CVT (belt and variator)

Sales area

49S

Vehicle built by

Zhejiang Senling Motorcycle Co.,Ltd

Test vehicle model

HUNTER-4

Filing history and where it was sold

Scooterstar Motors filed one certificate under this family, for model year 2026, sold as 49-state (not certified for sale in California).

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

Certified emission levels: CO 7.1, HC 0.5 g/km.

Other records carrying the same engine code

Scooterstar Motors 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:

• SSSTC.049MCA (2025)

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

• Titan Imports Inc.RTTNC.049MC12024 · same engine factory
• Titan Imports Inc.PTTNC.049MC12023 · same engine factory
• Titan Imports Inc.NTTNC.049MC12022 · same engine factory
• Gst Motor LLCSGSTC.049MC12025 · different engine factory
• Gst Motor LLCRGSTC.049MC12024 · different engine factory
• Gst Motor LLCPGSTC.049MC12023 · different engine factory
• Gst Motor LLCNGSTC.049MC12022 · 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 TSSTC.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.

AVENTRU-50 · AVENZA-50 · BELLA-50 · BWS R2-50 · BWS-50 · CHASER-50 · F9-50 · FLASH-50 · HERO-50 · HF-50 · HUNTER-4 · JOG II-50 · JOG-50 · LI-50 · MACCHIATO-50 · MAGARI-50 · S9C-50 · SUN-50 · TURUTO-50 · V9-50 · Y1-50

Other American badges on engines from the same factory

• Zhejiang Xinba Technology Co.,Ltd. · 49-50cc6 American brands · 2020–2026