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The Scooter Parts Registry

Owner's guide

Sunyee Sports: finding your numbers, your engine and your parts

You own one. Here is what the federal certification record says about who actually built it, what to look for on the machine itself, and how to search for parts when the badge gets you nowhere.

Model years
2019–2026
Engine factories
4
Engine families
31
Badges alongside
9

Who built the engine in your Sunyee Sports

Sunyee Sports Inc. is the name on the certificate filed with the US EPA. That is the company that brought the machine into the country, not the company that built the engine. The record names 4 different Chinese engine factories across Sunyee Sports's filings — which means the badge alone does not tell you which engine you have.

It changed, and the year tells you which

This is the most useful thing on the page if you are buying parts. Two Sunyee Sports machines of different years can have engines from different factories, so a part that fits one may have nothing to do with the other.

Factory named on the certificate, by model year
Model yearEngine built by
2019Chongqing Loncin · Taizhou Huangyan Motorcycle LLC
2020Chongqing Loncin · Taizhou Huangyan Motorcycle LLC · Yongkang Sunyee Industrial Co., Ltd.
2021Chongqing Loncin · Taizhou Huangyan Motorcycle LLC · Yongkang Sunyee Industrial Co., Ltd.
2022Chongqing Loncin · Taizhou Huangyan Motorcycle LLC · Yongkang Sunyee Industrial Co., Ltd.
2023Chongqing Loncin · Juneng Motorcycle · Taizhou Huangyan Motorcycle LLC · Yongkang Sunyee Industrial Co., Ltd.
2024Chongqing Loncin · Juneng Motorcycle · Taizhou Huangyan Motorcycle LLC · Yongkang Sunyee Industrial Co., Ltd.
2025Chongqing Loncin · Juneng Motorcycle · Taizhou Huangyan Motorcycle LLC · Yongkang Sunyee Industrial Co., Ltd.
2026Chongqing Loncin · Juneng Motorcycle · Yongkang Sunyee Industrial Co., Ltd.

The numbers to find on the machine

Where these live depends on the shape of your machine rather than on the badge, so we do not repeat the search here — the sheets below cover it properly and are free. What matters for a Sunyee Sports specifically is which number settles things: with 4 factories on the record, the engine family number is what tells you which engine you have.

  1. The emission control information label

    Carries the engine family number. This is the strongest identifier your machine has and the one most owners have never looked at.

  2. The code stamped into the crankcase

    Survives when the label has not. It encodes cylinder count, orientation, bore and displacement class.

  3. The VIN

    Identifies the vehicle rather than the engine, and its first three characters name whoever registered it for sale.

Engine families on the record for Sunyee Sports

If the label under your seat carries one of these, it is a Sunyee Sports and this is the certificate it was sold under.

Engine familyModel yearsDisplacement
KSYSX.150THY2019149.6cc
KSYSX.223FMM2019223cc
LSYSX.125THA2020107, 124cc
LSYSX.150THY2020149.6cc
LSYSX.223FMM2020223cc
MSYSX.125DBA2021124cc
MSYSX.150THY2021149.6cc
MSYSX.223FMM2021223cc
NSYSX.125DBA2022124cc
NSYSX.125THA2022107, 124cc
NSYSX.150THY2022149.6cc
NSYSX.223FMM2022223cc
PSYSX.125DBA2023124cc
PSYSX.125THA2023107, 124cc
PSYSX.150THY2023149.6cc
PSYSX.177ECA2023177cc
PSYSX.223FMM2023223cc
RSYSX.125DBA2024124cc
RSYSX.125THA2024107, 124cc
RSYSX.150THY2024149.6cc
RSYSX.177ECA2024177cc
RSYSX.223FMM2024223cc
SSYSX.125DBA2025124cc
SSYSX.125THA2025107, 124cc
SSYSX.150THY2025149.6cc
SSYSX.177ECA2025177cc
SSYSX.223FMM2025223cc
TSYSX.125DBA2026124cc
TSYSX.125THA2026107, 124cc
TSYSX.177ECA2026177cc
TSYSX.223FMM2026223cc

The other names to search under

9 other US brands sold machines whose engines came from the same factory at the same displacement. When a search for “Sunyee Sports” returns nothing, these are the names worth trying instead.

How to search for a part

Searching the badge is searching the weakest information you have. These are built from Sunyee Sports's own record, roughly strongest first — replace <part> with what you need, and add the measurement you took.

  1. 1KSYSX.150THY <part>
  2. 2149.6cc <part>
  3. 3Chongqing 149.6cc <part>
  4. 4Activmo Auto Co Ltd. <part>
  5. 5Sunyee Sports Inc. <part>

The strongest search usually has no badge in it at all. An engine family number plus a measurement finds listings from sellers who have never heard of Sunyee Sports, which is most of them.

Free sheets to take to the machine

Or print all fifteen at once 44 pages covering identification, measurement, records and diagnosis. Free, no account, no email.

What this page does not tell you

This record covers certificates whose engines were built in China. Sunyee Sports Inc. filed 44 certificate rows in total, of which 40 are covered here, about 91%. The rest had engines built elsewhere and are outside this registry's scope.

It also cannot tell you that a part fits. A shared factory is a research lead — a list of other badges worth searching under — and nothing more. These machines are assembled from several component suppliers, and those suppliers change, sometimes inside a single model year. Why that is, and how to measure instead.

Elsewhere 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.