Engine family RHSNX.735UDS

What this record says

Sold in the US by

Hisun Motors Corp., U.S.A.

Engine built by

Chongqing Huansong

Vehicle category

ATVB-Meeting EPA ATV Definition

Certificate numbers

RHSNX.735UDS-009-R01

What the number itself says

Reading RHSNX.735UDS left to right: R is the model-year letter for 2024, HSN is the three-character code the EPA assigned to Hisun Motors Corp., U.S.A. as certificate holder, X marks an off-road certification, .735 is the displacement in litres, so 735cc and UDS is Hisun Motors Corp., U.S.A.'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 Hisun Motors Corp., U.S.A. submitted for this family (model HS750UTV-6D) carried engine code HS1102MV-B. In the Chinese engine-model convention that reads as one cylinder with a nominal 102 mm bore, MV series. Against the certified 735cc that implies a stroke of roughly 90 mm — a sanity check for a piston or cylinder listing, not a published figure.

The certificate describes a four-stroke, single-cylinder engine with 4 valves per cylinder fed by sequential multi-port fuel injection, with an oxygen sensor for closed-loop fuelling, run by an engine control module (ECM). There is a catalytic converter in the exhaust, recorded as "Three Way Catalyst (TWC), single-bed, closed-loop warm up".

Rated power on the record is 34 kW (about 46 hp) at 5,500 rpm, driving through a CVT (belt and variator).

Engine code on test vehicle

HS1102MV-B

Nominal bore (from the code)

102 mm · implied stroke ≈ 90 mm

Cylinders / valves

1 · 4 per cylinder

Cycle

four-stroke

Fuel delivery

sequential multi-port fuel injection

Oxygen sensor

yes (closed loop)

Engine control

ECM

Catalytic converter

Three Way Catalyst (TWC), single-bed, closed-loop warm up

Rated power

34 kW (≈46 hp)

Rated speed

5,500 rpm

Transmission

CVT (belt and variator)

Sales area

49S

Vehicle built by

Chongqing Huansong Science and Technology Industrial Co., Ltd.; Vietnam New Century Industrial Company Limited

Test vehicle model

HS750UTV-6D

Filing history and where it was sold

Hisun Motors Corp., U.S.A. filed one certificate under this family, for model year 2024, sold as 49-state (not certified for sale in California).

The vehicle itself is recorded as built by Chongqing Huansong Science and Technology Industrial Co., Ltd. and Vietnam New Century Industrial Company Limited in China and Vietnam, while the engine came from Chongqing Huansong. Chassis parts and engine parts therefore have different origins.

Certified emission levels: CO 2.4, HC+NOx 0.9 g/km.

Other records carrying the same engine code

Hisun Motors Corp., U.S.A. 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:

• PHSNX.735UDS (2023)
• SHSNX.735UDS (2025)
• THSNX.735UDS (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 RHSNX.735UDS

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.

AXIS XS750 · AXIS XS750 C · Challenger MXC 750D · HS750UTV-11D · HS750UTV-12D · HS750UTV-13D · HS750UTV-3D · HS750UTV-5D · HS750UTV-6D · HS750UTV-D · Remington750D · Sector 750D Crew · Sector 750D EX · Sector 750D FX · Sector750D

Other American badges on engines from the same factory

• Chongqing Huansong · 250cc4 American brands · 2010–2015
• Chongqing Huansong · 500cc and above4 American brands · 2012–2027
• Chongqing Huansong · 200cc4 American brands · 2009–2026
• Chongqing Huansong · 450cc3 American brands · 2012–2026