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MotoLibrary Score
76/100High Performance
Power/Weight
0.52 hp/kg
Torque
549 Nm
Engine
5700 ccm
Technical Overview
2008 Boss Hoss BHC-9 ZZ4 Technical Analysis & Specification Breakdown
At the heart of the 2008 Boss Hoss BHC-9 ZZ4 custom - cruiser motorcycle, Boss Hoss pairs a 5700 cc (347.8 cu in) liquid-cooled v8, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 355 HP (259.1 kW) at 5,250 rpm while maximum torque reaches 549.2 Nm (405.1 lb-ft) at 4,200 rpm, transferring power to the rear wheel through shaft drive (cardan) final drive. With a specific output of 62.3 HP per liter and a 1,050 rpm working window between peak torque (4,200 rpm) and peak power (5,250 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 BHC-9 ZZ4 measures 680.4 kg (1500 lbs) dry, translating to a power-to-weight ratio of 0.52 HP/kg (1.92 kg per horsepower). Rider ergonomics and chassis geometry center around a 2,070 mm (81.5 in) wheelbase engineered for planted straight-line stability.
Specific Output
62.3 HP/L
Power-to-Weight
0.52 HP/kg (1.92 kg/HP)
Power Band Window
4,200–5,250 rpm
Engine
Displacement5700.0 ccm (347.81 cubic inches)
Engine TypeV8, four-stroke
Engine DetailsV8, four-stroke
Power355.0 HP (259.1 kW)) @ 5250 RPM
Torque549.2 Nm (56.0 kgf-m or 405.1 ft.lbs) @ 4200 RPM
Fuel SystemInjection. Holly 680 cfm Throttle Body
CoolingLiquid
Transmission
Final DriveShaft drive (cardan) (final drive)
Chassis
Rake35.0°
Front SuspensionInverted forks
Front Travel89 mm (3.5 inches)
Rear SuspensionDual 17´ coilover shocks, single 17.5 inch rebound damper
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.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
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.
