At the heart of the 2011 Jianshe JS400ATV atv motorcycle, Jianshe utilizes a 398 cc (24.3 cu in) oil & air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 21.5 HP (15.7 kW) at 6,500 rpm while maximum torque reaches 26 Nm (19.2 lb-ft) at 5,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 54 HP per liter and a 1,500 rpm working window between peak torque (5,000 rpm) and peak power (6,500 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the JS400ATV measures 270 kg (595 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (12.56 kg per horsepower). Rider ergonomics and chassis geometry center around a 860 mm (33.9 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 2,100 mm (82.7 in) wheelbase engineered for planted straight-line stability. The 14-liter (3.7 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
54 HP/L
Power-to-Weight
0.08 HP/kg (12.56 kg/HP)
Power Band Window
5,000–6,500 rpm
Standover Height
860 mm (33.9 in)
Engine
Displacement398.0 ccm (24.29 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power21.5 HP (15.7 kW)) @ 6500 RPM
Torque26.0 Nm (2.7 kgf-m or 19.2 ft.lbs) @ 5000 RPM
Compression10.0:1
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Fuel SystemCarburettor
IgnitionCDI
CoolingOil & air
Transmission
Gearbox5-speed
Final DriveChain (final drive)
DrivelineWith revserse. Axle final drive.
Chassis
Wheelbase2100 mm (82.7 inches)
Wheels & Brakes
Front Tyre25/8-12
Rear Tyre25/10-12
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight270.0 kg (595.2 pounds)
Power/Weight0.0795 HP/kg
Seat Height860 mm (33.9 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
