JAVA 500 OHV – year 1931
Manufacturer: Zbrojovka Ing. F. Janećek, Prague-Nusle II, Czechoslovakia
In the late 1920s, Alex von Novikoff, Wanderer company constructor, built a motorcycle with a frame of pressed steel parts, driven by a shaft with joints and front suspension, in which the fork was sprung by a leaf spring. The three-speed gearbox of this vehicle was locked to a single-cylinder engine with a capacity 500 cm3. Despite the modern design and nice shape, this model was not yet mature. Several of the copies sold were returned to the label, to cure "childhood diseases."”. The management of the company breathed a sigh of relief, when this model was sold to the Prague arms factory, which in years 1927 — 1928 was going to start producing motorcycles. Zbrojovka already had an offer for a Schliha motorcycle, with a two-stroke engine. In addition, the Austrian company Puch offered eng. Janećkovi their licenses. However, the Wanderer label won in this competition, because, in addition to the technical documentation, also offered some devices. Thanks to this, in 1929 year, the first Jawa motorcycle was created (the name was created from the abbreviation of two surnames - Janećek and Wanderer).
Eks-Wanderer received a new fuel tank, painted with yellow and red varnish, and a four-stroke engine with overhead valve timing (OHV), which he achieved from capacity 498,7 cm3 power 13,2 kW(18 KM). This modern power unit featured a hemispherical combustion chamber and pressurized dry sump lubrication. The driving force was transmitted by a dry disc clutch and a triple- or a four-speed gearbox. The motorcycle had a double pressed frame. Primary, complicated design of the front fork, due to frequent cracks and high production costs, replaced with a pressed steel fork while maintaining a flat quarter-elliptical spring as a spring element. Motorcycle, popularly known as "rumpal” (winch), it was heavy and its production costs were high. It had a curb weight 175 kg and reached the top speed 110 km/h. It was produced in standard or slightly increased power, as special, most often, however, in combination with a sidecar. Jawa and the cart weighed 280 kg and developed maximum speed 100 km/h, consuming 7 liters of fuel per 100 km. Do 1932 year produced, in three series, 1016 pieces of this model.