SPECIFICATIONS
2006 Suzuki Boulevard S40

ENGINE
Engine type: Air-cooled vertical single
Valve arrangement: SOHC; 2 intake, 2 exhaust valves; threaded adjusters
Displacement, bore x stroke: 652cc, 94 x 94mm
Compression ratio: 8.5:1
Carburetion: 1, 40mm CV
Minimum fuel grade: 87 octane
Transmission: Wet multiplate clutch; 5 speeds
Final drive: belt

The big air-cooled 652cc single makes very tractable power, which helps to make the bike easy to ride. 

CHASSIS
Wet weight: 380 lb.
GVWR: 785 lb.
Wheelbase: 58.4 in.
Overall length: 85.8 in.
Rake/trail: 35 degrees / 5.8 in.
Seat height: 27.6 in.
Wheels: Wire-spoke
Front tire: 100/90-19 IRC tube-type
Rear tire: 140/80-15 IRC tube-type
Front brake: 2-piston caliper, 10.4-in. disc
Rear brake: Drum, rod operated
Front suspension: 38mm stanchions, 5.4 in. travel
Rear suspension: Dual dampers, 3.1 in. travel, adjustment for spring preload
Handlebar width: 28.4 in.
Fuel capacity: 2.8 gal.

ELECTRICAL & INSTRUMENTATION
Forward lighting: 55/60-watt 5.5-in. headlight, position lights
Taillight: 1 bulb, license light
Instruments: Speedometer, odometer; warning lights for neutral, high beam, left and right turn signals

PERFORMANCE
Fuel mileage: 44-61 mpg, 52.9-mpg average
RPM at 60 mph, top gear: 3940
Quarter-mile performance: 16.35 sec., 77.2 mph