EPA engine family
Engine family CHSNX.686A15
If this code is printed on your emission label, this is your machine's federal record: sold under Hisun Motors Corp., U.S.A., with an engine built by Chongqing Huansong, certified as ATVs and UTVs and side-by-sides.
- Displacement
- —
- Model years
- 2012
- Models certified
- 19
- Certificates
- 1
What this record says
- Sold in the US by
- Hisun Motors Corp., U.S.A.
- Engine built by
- Chongqing Huansong
- Vehicle category
- ATVB & UTV - EPA only
- Certificate numbers
- CHSNX.686A15-003
What the number itself says
Reading CHSNX.686A15 left to right: C is the model-year letter for 2012, 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, .686 is the displacement in litres, so 686cc and A15 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 certificate describes a four-stroke, single-cylinder engine with 5 valves per cylinder fed by sequential multi-port fuel injection, with an oxygen sensor for closed-loop fuelling, run by an ignition control module (CDI-type ignition). 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 22.1 kW (about 30 hp) at 5,000 rpm, driving through a CVT (belt and variator).
- Cylinders / valves
- 1 · 5 per cylinder
- Cycle
- four-stroke
- Fuel delivery
- sequential multi-port fuel injection
- Oxygen sensor
- yes (closed loop)
- Engine control
- ICM
- Catalytic converter
- Three Way Catalyst (TWC), single-bed, closed-loop warm up
- Rated power
- 22.1 kW (≈30 hp)
- Rated speed
- 5,000 rpm
- Transmission
- CVT (belt and variator)
- Sales area
- 50S+49S
- Vehicle built by
- Chongqing Huansong Industries (Group) Co., Ltd.
- Test vehicle model
- YS700XLT
Filing history and where it was sold
Hisun Motors Corp., U.S.A. filed one certificate under this family, for model year 2012, sold as both a 50-state and a 49-state version.
The vehicle itself is recorded as built by the same company, Chongqing Huansong Industries (Group) Co., Ltd. in China — engine and chassis from one source.
Certified emission levels: CO 6.2, HC+NOx 1.0 g/km.
Models certified under CHSNX.686A15
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.
Bighorn 700 · Bighorn 700X Crew · COLEMAN UT600 · COLEMAN UT700 · Coleman Outfitter 700 · Coleman UT700 · Gray Wolf 700 · HS 600ATV · HS 600UTV · HS 700ATV · HS 700UTV-4 · HS 700UTV-5 · MSU 600 · MSU 700 · MSU 700-4 · Metal 600U · Metal 700U · YS 700 · YS 700XLT
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.