Positioned in Yuki's custom - cruiser motorcycle lineup, the 2014 Yuki 400 Darker relies on a 399 cc (24.4 cu in) air-cooled v2, four-stroke powerplant. In factory specification, peak output is rated at 29.9 HP (21.8 kW) at 8,000 rpm while maximum torque reaches 28.3 Nm (20.9 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 74.9 HP per liter and a 1,000 rpm working window between peak torque (7,000 rpm) and peak power (8,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the 400 Darker measures 194 kg (428 lbs) dry, translating to a power-to-weight ratio of 0.15 HP/kg (6.49 kg per horsepower). Rider ergonomics and chassis geometry center around a 730 mm (28.7 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops. The 13.5-liter (3.6 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 125 km/h (78 mph).
Specific Output
74.9 HP/L
Power-to-Weight
0.15 HP/kg (6.49 kg/HP)
Power Band Window
7,000–8,000 rpm
Standover Height
730 mm (28.7 in)
Engine
Displacement399.0 ccm (24.35 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsV2, four-stroke
Power29.9 HP (21.8 kW)) @ 8000 RPM
Torque28.3 Nm (2.9 kgf-m or 20.9 ft.lbs) @ 7000 RPM
Bore x Stroke68.0 x 55.0 mm (2.7 x 2.2 inches)
Valves/Cylinder2
Fuel SystemCarburettor
Fuel ControlOverhead Cams (OHC)
IgnitionCDI
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
Performance
Top Speed125.0 km/h (77.7 mph)
Chassis
Frame TypeSteel
Wheels & Brakes
Front Tyre90/90-21
Rear Tyre140/90-15
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight194.0 kg (427.7 pounds)
Power/Weight0.1541 HP/kg
Seat Height730 mm (28.7 inches) If adjustable, lowest setting.
Overall Length2250 mm (88.6 inches)
Fuel Capacity13.50 litres (3.57 US gallons)
Other
StarterElectric
Color OptionsBlack, red
Notes
Yuki bikes are sold in The Czech Republic and The Slovak Republic.
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.
