Which Yamazuki Inc. models have a Chinese-built engine?

3 of the 6 US certificate filings on record for Yamazuki Inc. name an engine manufacturer in China, across 2011–2012: Ningbo Longjia Motorcycle Co., Ltd., Zhejiang Shenmao Appliance Co.,Ltd.. The rest of the range is built elsewhere and is not covered by this registry.

Will parts from another brand fit my Yamazuki Inc.?

A shared factory and engine size makes another brand a strong candidate, but it does not prove the part numbers match. These machines are assembled from multiple component suppliers, so measure the part you have before ordering a replacement.

US certificate holder — partial coverage

Which Yamazuki models have a Chinese-built engine?

3 of the 6 certificate filings on record for Yamazuki Inc. name a China-built engine. This page covers only those, and says nothing about the rest of the range.

Model years: 2011–2012
Engine factories: 2
Engine families: 3
Coverage: 3 of 6 filings

What the Yamazuki filings say about the engines

Every Yamazuki filing on record is carburetted — 3 certificate rows, 2011 to 2012, and not one fuel-injected engine among them.

The engine codes on Yamazuki's test vehicles —just one across the filings — are led by SM152FM. The code is stamped on the crankcase and is a better search term than the badge.

1 of the 3 filings are 50-state (California-legal); the other 2 were 49-state only.

Rated power across the range runs from 3 kW to 4.7 kW (about 4 to 6 hp).

The vehicle builders named are NINGBO LONGJIA MOTORCYCLE CO., LTD and Zhejiang Shenmao Appliance Co.,Ltd. — the chassis and the engine do not always share a source.

Each figure is read straight off the EPA certificate rows; the per-family pages below carry the full breakdown for every engine family.

The factory changed. Here is when.

Engine manufacturer by model year, from the certification record
Model year	Engine factory on the certificate
2012	Zhejiang Shenmao Appliance Co.,Ltd.
2011	Ningbo Longjia Motorcycle Co., Ltd.

Other American badges on the same engines

These machines came out of the same factory at the same engine size. If Yamazuki Inc. parts are hard to find, these are where to look next — after measuring.

Ningbo Longjia Motorcycle Co., Ltd. · 49-50ccChicago Scooter Company, LLC, Cobra Scooters, Flyscooters LLC, Genuine Scooters, LLC, Jcl Powersports Llc. and 1 more

Model names certified under Yamazuki Inc.

28 distinct model designations appear on this brand's China-engine certificates. Yours should be among them — importers sometimes market a machine under a different name than the one they certified.

LJ50QT-2K · LJ50QT-2L · LJ50QT-4 · LJ50QT-4A · LJ50QT-5 · LJ50QT-5A · LJ50QT-5M · LJ50QT-F · LJ50QT-H · LJ50QT-K · LJ50QT-M · TREVIS 2T · TREVIS 4T · YZ110-20 · YZ110-26 · YZ110-29 · YZ110-30 · YZ110-58 · YZ110-93 · YZ110-94 · YZ110-98 · YZ50-1 · YZ50-2 · YZ50-3 · YZ50-4 · YZ50-5 · YZ50-6 · YZ50-7

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. Based on the 3 China-engine rows among 6 certificate rows filed by Yamazuki Inc.. Non-China filings are out of scope. Full provenance and method.