Built around Senke's naked motorcycle platform, the 2022 Senke SK400-K Alien Monster pairs a 378 cc (23.1 cu in) liquid-cooled twin, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 38.2 HP (27.9 kW) at 8,500 rpm while maximum torque reaches 35 Nm (25.8 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 101.1 HP per liter and a 1,500 rpm working window between peak torque (7,000 rpm) and peak power (8,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the SK400-K Alien Monster measures 189 kg (417 lbs) wet (curb), translating to a power-to-weight ratio of 0.2 HP/kg (4.95 kg per horsepower). Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,380 mm (54.3 in) wheelbase engineered for quick, flickable steering geometry. The 16-liter (4.2 US gal) fuel tank paired with a rated consumption of 3.4 L/100 km provides an estimated theoretical range of roughly 471 km (293 miles) between fill-ups, while factory top speed is listed at 140 km/h (87 mph).
Specific Output
101.1 HP/L
Power-to-Weight
0.2 HP/kg (4.95 kg/HP)
Power Band Window
7,000–8,500 rpm
Theoretical Range
~471 km (293 mi)
Engine
Displacement378.0 ccm (23.07 cubic inches)
Engine TypeTwin, four-stroke
Power38.2 HP (27.9 kW)) @ 8500 RPM
Torque35.0 Nm (3.6 kgf-m or 25.8 ft.lbs) @ 7000 RPM
Compression11.1:1
Bore x Stroke74.0 x 65.0 mm (2.9 x 2.6 inches)
Fuel SystemInjection. Delphi
Fuel ControlOverhead Cams (OHC)
IgnitionC.D.I
CoolingLiquid
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet Multiplate, slip
Performance
Top Speed140.0 km/h (87.0 mph)
Fuel Consumption3.40 litres/100 km (29.4 km/l or 69.18 mpg)
Greenhouse Gases78.9 CO2 g/km. (CO2 - Carbon dioxide emission)
ExhaustAluminum and stainless steel muffler
Chassis
Frame TypeBraid type
Front SuspensionUpside down forks
Rear SuspensionMonoshock
Wheelbase1380 mm (54.3 inches)
Ground Clearance150 mm (5.9 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre150/55-17
Front BrakesSingle disc. ABS
Rear BrakesSingle disc. ABS
Dimensions & Weight
Weight incl.189.0 kg (416.7 pounds)
Seat Height800 mm (31.5 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.
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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
