At the heart of the 2008 Suzuki Impulse 400 sport motorcycle, Suzuki features a 399 cc (24.4 cu in) liquid-cooled in-line four, four-stroke configuration. In factory specification, peak output is rated at 52.3 HP (38.2 kW) at 11,000 rpm while maximum torque reaches 37 Nm (27.3 lb-ft) at 9,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 131.1 HP per liter and a 2,000 rpm working window between peak torque (9,000 rpm) and peak power (11,000 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 Impulse 400 measures 170 kg (375 lbs) dry, translating to a power-to-weight ratio of 0.31 HP/kg (3.25 kg per horsepower). Rider ergonomics and chassis geometry center around a 760 mm (29.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,655 mm (65.2 in) wheelbase engineered for planted straight-line stability. The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Suzuki archive, this model family spans 2 indexed model years from 2008 to 2011, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
131.1 HP/L
Power-to-Weight
0.31 HP/kg (3.25 kg/HP)
Power Band Window
9,000–11,000 rpm
Standover Height
760 mm (29.9 in)
Engine
Displacement399.0 ccm (24.35 cubic inches)
Engine TypeIn-line four, four-stroke
Engine DetailsIn-line four, four-stroke
Power52.3 HP (38.2 kW)) @ 11000 RPM
Torque37.0 Nm (3.8 kgf-m or 27.3 ft.lbs) @ 9000 RPM
Compression12.2:1
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionFull transistor system
LubricationWet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet multiple plate coil springs
Chassis
Frame TypeDouble cradle
Wheelbase1655 mm (65.2 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre140/70-17
Front BrakesDouble disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight170.0 kg (374.8 pounds)
Power/Weight0.3076 HP/kg
Seat Height760 mm (29.9 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.
