Jawa 50 Robby.       Spec. from Jawa Brochure:-
4 stroke,  air cooled, 1 cylinder,  39mm bore,  41.4mm stroke,  49.5cc,  8.5:1 comp, max power 2.5kW @ 8500 rpm,  electric & kick start,  4 speed,  1200mm wheelbase, 730mm seat height, 6.5lt fuel tank, alloy wheels,  tyres- 2.5"x16" front / 3"x16" rear,  suspension- front 80mm telescopic forks / rear 70mm telescopic units,  brakes- front 200mm disc / rear 124mm drum,
dry weight 80kg, maximum speed 48km/hr.