Sunday, October 25, 2009

OHC Jawa

The Jawa 500 OHC was built in Czechslovakia from the early to mid 50's.Four-stroke air-cooled OHC twin cylinder. Displacement 488 cc (bore and stroke 65 x73.6 mm). Engine power 19.1 kW at 5500 r.p.m.
They also made single-wheeled trailers and sidecars for it. Above are various ads from Jawa promoting the 350cc OHC version, as well as their "hi-tech" factory.1956 Jawa 500 OHC from the Czech Republic. It has a bevel gear drive overhead camshaft. It is nicely restored in the original paint combination.
Compression ratio 7 to 1
Vertical shaft camshaft drive. Lubrication by three-way pump located on the frame ahead of the rear mudguard. Four-speed gearbox in unit with engine.Maximum speed 135 km/hour.Simple closed, in the rear bifurcating frame made with square steel sections. Slider type rear wheel suspension. Telescopic front fork. Multi-plate clutch in oil bath, automatically disengaged by gear pedal movement. Weight 156 kg.
Within a few years the situation straightened out and some customers began to demand a more powerful machine. In as early as 1950 a half-litre had been prepared to be put in serial production in 1952, model mark 15/00. It was an air-cooled four-stroke OHC twin cylinder with vertical shaft and worm gear camshaft drive, hence nicknamed the "Snek" ("Snail" or "Worm" in Czech) displacement 488 cc (65x73.5), power output 19.1 kW (26 HP) at 5500 r.p.m. The gearbox was four-speed, ignition by Lucas magneto soon replaced by PAL coil, and battery system with 60 W dynamo. The following 15/01 model featured reconstructed valve gear with Gleason type bevel gearing. Lubrication was by oil pump, the capacity of the separate oil tank was 4.5 litres. The motor cycle frame was of the JAWA 250 type duly reinforced with the possibility of sidecar attachment. The front wheel suspension was by telescopic fork with oil dampers; that of the rear wheel by coil springs. The 16 litre capacity tank was joined by swinging saddle, of a similar type like the 250 model. Front tyre size was 3.25 - 19, rear tyre size 3.50 – 19, weight 156 kg, maximum speed 135 km/hour, average consumption about 4 litres per 100 km.

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