Engine family AMTBC.049N2M

What this record says

Sold in the US by

Motobravo Inc.

Engine built by

Zhejiang Leike Machine Industry Co., Ltd.

Vehicle category

Highway Motorcycle - Ia (<50cc)

Certificate numbers

AMTBC.049N2M-002

What the number itself says

Reading AMTBC.049N2M left to right: A is the model-year letter for 2010, MTB is the three-character code the EPA assigned to Motobravo as certificate holder, C marks a highway (street-legal) certification, .049 is the displacement in litres, so 49cc and N2M is Motobravo'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 Motobravo submitted for this family (model LK50QT-15) carried engine code LK139QMB. In the Chinese engine-model convention that reads as one 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, run by an ignition control module (CDI-type ignition). There is a catalytic converter in the exhaust, recorded as "TWC, single bed, open loop". Secondary air injection is fitted.

Rated power on the record is 2.5 kW (about 3 hp) at 8,000 rpm, driving through a CVT (belt and variator).

Engine code on test vehicle

LK139QMB

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

ICM

Catalytic converter

TWC, single bed, open loop

Air injection

AIR

Rated power

2.5 kW (≈3 hp)

Rated speed

8,000 rpm

Transmission

CVT (belt and variator)

Sales area

49S

Vehicle built by

ZHEJIANG LEIKE MACHINE INDUSTRY CO., LTD

Test vehicle model

LK50QT-15

Filing history and where it was sold

Motobravo filed one certificate under this family, for model year 2010, sold as 49-state (not certified for sale in California).

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

Certified emission levels: CO 1.8, HC 0.5 g/km.

Other records carrying the same engine code

Motobravo certified an engine with this code under 3 other family numbers — the same engine filed again in another year, or in an off-road and a street version:

• 9MTBC.049N2M (2009)
• BMTBC.049N2M (2011)
• CMTBC.049N2M (2012)

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 AMTBC.049N2M

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.

BARI 50 · BOLOGNA 50 · FLORENCE 50 · FOGGIA 50 · LK50GY-2 · LK50QT-14 · LK50QT-15 · LK50QT-17 · LK50QT-19 · LK50QT-21 · LK50QT-3 · LK50QT-7 · MARINO 50 · NAPOLI 50 · TORINO 50 · VENICE 50

Other American badges on engines from the same factory

• Zhejiang Leike Machine Industry Co., Ltd. · 150cc2 American brands · 2009–2025
• Zhejiang Leike Machine Industry Co., Ltd. · 49-50cc2 American brands · 2009–2020