At the heart of the 2006 Suzuki Boulevard S40 custom - cruiser motorcycle, Suzuki utilizes a 655.5 cc (40 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, maximum torque reaches 50 Nm (36.9 lb-ft), transferring power to the rear wheel through a 5-speed gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 94.0 x 94.0 mm (3.7 x 3.7 inches) with a 8.5:1 compression ratio.
On the scales, the Boulevard S40 measures 172 kg (379 lbs) wet (curb). 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 1,480 mm (58.3 in) wheelbase engineered for balanced agility and highway composure. The 10.5-liter (2.8 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Suzuki archive, this model family spans 17 indexed model years from 2005 to 2022, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
700 mm (27.6 in)
Engine
Displacement655.5 ccm (40.00 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Torque50.0 Nm (5.1 kgf-m or 36.9 ft.lbs)
Compression8.5:1
Bore x Stroke94.0 x 94.0 mm (3.7 x 3.7 inches)
Fuel SystemCarburettor. Mikuni
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionTransistorized
LubricationWet Sump
CoolingAir
Transmission
Gearbox5-speed
Final DriveBelt (final drive)
ClutchWet, multiple discs, cable operated
Chassis
Rake35.0°
Trail147 mm (5.8 inches)
Front SuspensionTelescopic, coil spring, oil damped
Front Travel140 mm (5.5 inches)
Rear SuspensionTwin shock, 5-way adjustable spring preload
Rear Travel80 mm (3.1 inches)
Wheelbase1480 mm (58.3 inches)
Ground Clearance135 mm (5.3 inches)
Wheels & Brakes
Front Tyre100/90-H19
Rear Tyre140/80-H15
Front BrakesSingle disc
Front Brake Ø265 mm (10.4 inches)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight160.0 kg (352.7 pounds)
Weight incl.172.0 kg (379.2 pounds)
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.
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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
