EPA engine family
Engine family RAMSC.169MCE
If this code is printed on your emission label, this is your machine's federal record: sold under Amstar Motors LLC, with an engine built by Taizhou Zhongneng (ZNEN), certified as street-legal scooters and motorcycles.
- Displacement
- —
- Model years
- 2024
- Models certified
- 21
- Certificates
- 1
What this record says
- Sold in the US by
- Amstar Motors LLC
- Engine built by
- Taizhou Zhongneng (ZNEN)
- Vehicle category
- Highway Motorcycle - Ib (50-169cc)
- Certificate numbers
- RAMSC.169MCE-004
What the number itself says
Reading RAMSC.169MCE left to right: R is the model-year letter for 2024, AMS is the three-character code the EPA assigned to Amstar Motors as certificate holder, C marks a highway (street-legal) certification, .169 is the displacement in litres, so 169cc and MCE is Amstar 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 Amstar Motors submitted for this family (model Tiger 175) carried engine code BN161QMK-A. In the Chinese engine-model convention that reads as one cylinder with a nominal 61 mm bore, QMK series.
The certificate describes a four-stroke, single-cylinder engine with 2 valves per cylinder fed by throttle-body fuel injection, with an oxygen sensor for closed-loop fuelling, run by an engine control module (ECM). No catalytic converter is listed.
Rated power on the record is 8 kW (about 11 hp) at 7,500 rpm, driving through a CVT (belt and variator).
- Engine code on test vehicle
- BN161QMK-A
- Nominal bore (from the code)
- 61 mm
- Cylinders / valves
- 1 · 2 per cylinder
- Cycle
- four-stroke
- Fuel delivery
- throttle-body fuel injection
- Oxygen sensor
- yes (closed loop)
- Engine control
- ECM
- Catalytic converter
- none listed
- Rated power
- 8 kW (≈11 hp)
- Rated speed
- 7,500 rpm
- Transmission
- CVT (belt and variator)
- Sales area
- 50S
- Vehicle built by
- Taizhou Zhongneng Motorcycle Co.,Ltd.
- Test vehicle model
- Tiger 175
Filing history and where it was sold
Amstar Motors filed one certificate under this family, for model year 2024, sold as 50-state, California included.
The vehicle itself is recorded as built by the same company, Taizhou Zhongneng Motorcycle Co.,Ltd. in China — engine and chassis from one source.
Certified emission levels: CO 2.3, HC 0.2 g/km.
Other records carrying the same engine code
Amstar Motors certified an engine with this code under 6 other family numbers — the same engine filed again in another year, or in an off-road and a street version:
- RAMSC.169MCA (2024)
- SAMSC.169MCA (2025)
- SAMSC.169MCB (2025)
- SAMSC.169MCE (2025)
- TAMSC.169MCA (2026)
- TAMSC.169MCE (2026)
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 RAMSC.169MCE
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.
AMAX 175 · BACKPACKER 175 · Coral 175 · Cruise 175 · Frigate 175 · Hound 175 · Marshal 200 · NVH 175 · R-X 175 · R9 175 · TANK 200 · TANK II 200 · TANK III 200 · Tiger 175 · Tiggo 200 · V11 175 · V12 175 · Valiant 200 · Vector 175 · Veracruz 150 · Veracruz 175
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.