Built around Suzuki's custom - cruiser motorcycle platform, the 2008 Suzuki Boulevard 400 relies on a 399 cc (24.4 cu in) liquid-cooled v2, four-stroke powerplant. In factory specification, peak output is rated at 32.2 HP (23.5 kW) at 8,000 rpm while maximum torque reaches 33 Nm (24.3 lb-ft) at 6,000 rpm, transferring power to the rear wheel through a 5-speed gearbox. With a specific output of 80.7 HP per liter and a 2,000 rpm working window between peak torque (6,000 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 Boulevard 400 measures 240 kg (529 lbs) dry, translating to a power-to-weight ratio of 0.13 HP/kg (7.45 kg per horsepower). Rider ergonomics and chassis geometry center around a 700 mm (27.6 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 7 indexed model years from 2008 to 2016, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
80.7 HP/L
Power-to-Weight
0.13 HP/kg (7.45 kg/HP)
Power Band Window
6,000–8,000 rpm
Standover Height
700 mm (27.6 in)
Engine
Displacement399.0 ccm (24.35 cubic inches)
Engine TypeV2, four-stroke
Engine DetailsV2, four-stroke
Power32.2 HP (23.5 kW)) @ 8000 RPM
Torque33.0 Nm (3.4 kgf-m or 24.3 ft.lbs) @ 6000 RPM
Compression10.5:1
Bore x Stroke65.0 x 62.5 mm (2.6 x 2.5 inches)
Fuel SystemCarburettor. BDSR29
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionFull transistor system
LubricationWet sump
CoolingLiquid
Transmission
Gearbox5-speed
ClutchWet multiple plate coil springs
Chassis
Frame TypeDouble cradle
Wheelbase1655 mm (65.2 inches)
Ground Clearance140 mm (5.5 inches)
Wheels & Brakes
Front Tyre130/90-16
Rear Tyre170/80-15
Front BrakesSingle disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight240.0 kg (529.1 pounds)
Power/Weight0.1341 HP/kg
Seat Height700 mm (27.6 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.
