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MotoLibrary Score
41/100Commuter
Power/Weight
0.16 hp/kg
Top Speed
120 km/h
Torque
38 Nm
Engine
343 ccm
Technical Overview
1996 Jawa 639 Chopper 350 Technical Analysis & Specification Breakdown
At the heart of the 1996 Jawa 639 Chopper 350 custom - cruiser motorcycle, Jawa relies on a 343 cc (20.9 cu in) air-cooled twin, two-stroke powerplant. In factory specification, peak output is rated at 23.6 HP (17.2 kW) at 5,250 rpm while maximum torque reaches 38.2 Nm (28.2 lb-ft) at 4,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 68.8 HP per liter and a 750 rpm working window between peak torque (4,500 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 639 Chopper 350 measures 147 kg (324 lbs) dry, translating to a power-to-weight ratio of 0.16 HP/kg (6.23 kg per horsepower). Rider ergonomics and chassis geometry center around a 750 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops.
Specific Output
68.8 HP/L
Power-to-Weight
0.16 HP/kg (6.23 kg/HP)
Power Band Window
4,500–5,250 rpm
Standover Height
750 mm (29.5 in)
Engine
Displacement343.0 ccm (20.93 cubic inches)
Engine TypeTwin, two-stroke
Engine DetailsTwin, two-stroke
Power23.6 HP (17.2 kW)) @ 5250 RPM
Torque38.2 Nm (3.9 kgf-m or 28.2 ft.lbs) @ 4500 RPM
CoolingAir
Transmission
Gearbox4-speed
Final DriveChain (final drive)
Performance
Top Speed120.0 km/h (74.6 mph)
Wheels & Brakes
Front BrakesSingle disc
Rear BrakesExpanding brake
Dimensions & Weight
Dry Weight147.0 kg (324.1 pounds)
Power/Weight0.1605 HP/kg
Seat Height750 mm (29.5 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.
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.
