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MotoLibrary Score
76/100High Performance
Power/Weight
0.77 hp/kg
Engine
5735 ccm
Technical Overview
2003 Boss Hoss ZZ4 350 (385 hp version) Technical Analysis & Specification Breakdown
Built around Boss Hoss's custom - cruiser motorcycle platform, the 2003 Boss Hoss ZZ4 350 (385 hp version) utilizes a 5735 cc (350 cu in) v8, four-stroke layout. In factory specification, peak output is rated at 385 HP (281 kW). With a specific output of 67.1 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the ZZ4 350 (385 hp version) measures 499 kg (1100 lbs) dry, translating to a power-to-weight ratio of 0.77 HP/kg (1.3 kg per horsepower). Rider ergonomics and chassis geometry center around a 686 mm (27 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 2,032 mm (80 in) wheelbase engineered for planted straight-line stability.
Specific Output
67.1 HP/L
Power-to-Weight
0.77 HP/kg (1.3 kg/HP)
Standover Height
686 mm (27 in)
Engine
Displacement5735.0 ccm (349.95 cubic inches)
Engine TypeV8, four-stroke
Engine DetailsV8, four-stroke
Power385.0 HP (281.0 kW))
Fuel SystemCarburettor
Chassis
Rake33.0°
Front SuspensionInverted forks
Wheelbase2032 mm (80.0 inches)
Ground Clearance178 mm (7.0 inches)
Wheels & Brakes
Front Brakes(Unspecified)
Rear Brakes(Unspecified)
Dimensions & Weight
Dry Weight499.0 kg (1,100.1 pounds)
Power/Weight0.7715 HP/kg
Seat Height686 mm (27.0 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.
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.
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.
