Jawa 640 Chopper (1994)

The Jawa 644 Chopper is a motorcycle model from 1994, with a two-stroke, 343.4cc parallel twin engine that is air-cooled and has a Jikov 28-29 CE horizontal carburetor. The ignition is a Magneto VAPE A67 contactless system and it has a 12V, 6Ah battery with a kick start. It produces a maximum power of 18 kW (25 hp) at 5500 rpm and a maximum torque of 33 Nm (25 ft.lb) at 5250 rpm. The transmission is a four-speed system with a multi-disc clutch in oil bath and a chain final drive. The frame is tubular and double, with a closed design, and the suspension consists of a hydraulic telescopic fork with steel spiral springs in the front, and a swingarm with hydraulic telescopic suspension units and spiral springs in the rear. The motorcycle has a front disc brake and a rear drum brake, with hydraulic and mechanical control respectively, and steel wheels with multi-spokes and deepened profiles. The front and rear tires have a size of 90/100-17” and 100/90-18” respectively. The dry weight is 147 kg (322 lbs) and the fuel capacity is 15 L (4.0 US gal).

Technical specifications:

Make Model: Jawa 644 Chopper

Year: 1994

Engine: Two stroke, parallel twin
Capacity: 343.4 cc / 21.0 cu in
Bore x Stroke: 58 x 65 mm
Compression Ratio: 10.2:1
Cooling System: Air cooled
Induction: Jikov 28-29 CE horizontal carburetor, slide type
Ignition: Magneto VAPE A67 contactless
Battery: 12V, 6Ah
Starting: Kick
Max Power: 18 kW / 25 hp @ 5500 rpm
Max Torque: 33 Nm / 3.4 kgf-m / 25 ft.lb @ 5250 rpm
Clutch: Multi disc in oil bath
Transmission: 4 Speed
Final Drive: Chain
Frame: Tubular, double, closed

Front Suspension: Hydraulic telescopic fork, steel spiral springs
Rear Suspension: Swingarm, hydraulic telescopic in suspension units, spiral springs
Rear Wheel Travel: 80 mm / 3.1 in
Front Brakes: ~A265 mm Disc, hydraulic control
Rear Brakes: ~A165 mm Drum, mechanical control
Wheels: Steel, deepened profile, multi-spokes
Front Tyre: 90/100-17″
Rear Tyre: 100/90-18″
Dry Weight: 147 kg / 322 lbs
Fuel Capacity: 15 L / 4.0 US gal

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