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MotoLibrary Score
38/100Commuter
Power/Weight
0.15 hp/kg
Torque
31 Nm
Engine
350 ccm
Technical Overview
1994 Jawa 640 Technical Analysis & Specification Breakdown
Engineered by Jawa for the motorcycle segment, the 1994 Jawa 640 pairs a 350 cc (21.4 cu in) twin, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 23 HP (16.8 kW) at 5,250 rpm while maximum torque reaches 31.4 Nm (23.1 lb-ft) at 4,750 rpm, transferring power to the rear wheel through a 4-speed gearbox. With a specific output of 65.7 HP per liter and a 500 rpm working window between peak torque (4,750 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 640 measures 150 kg (331 lbs) dry, translating to a power-to-weight ratio of 0.15 HP/kg (6.52 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance. The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
65.7 HP/L
Power-to-Weight
0.15 HP/kg (6.52 kg/HP)
Power Band Window
4,750–5,250 rpm
Standover Height
780 mm (30.7 in)
Engine
Displacement350.0 ccm (21.36 cubic inches)
Engine TypeTwin, two-stroke
Engine DetailsTwin, two-stroke
Power23.0 HP (16.8 kW)) @ 5250 RPM
Torque31.4 Nm (3.2 kgf-m or 23.1 ft.lbs) @ 4750 RPM
Valves/Cylinder0
Fuel ControlReed valve / power valve
IgnitionCDI
LubricationSeparate lubrication with automatic oil pump
Transmission
Gearbox4-speed
ClutchMultiplate wet clutch in oil bath
DrivelineChain final drive
Chain Size520
Wheels & Brakes
Front BrakesSingle disc
Rear BrakesExpanding brake
Dimensions & Weight
Dry Weight150.0 kg (330.7 pounds)
Power/Weight0.1533 HP/kg
Seat Height780 mm (30.7 inches) If adjustable, lowest setting.
Fuel Capacity17.00 litres (4.49 US gallons)
Reserve Fuel2.50 litres (0.66 US gallons)
Oil Capacity1.30 litres 2T reservoir / 0.80 L gearbox
Service & Fluids
Engine Oil2-stroke synthetic motorcycle oil (API TC / JASO FC/FD)
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.
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.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
