Yamaha YA-1
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The Yamaha YA-1 is the first motorcycle produced by the Yamaha Motor Company. It was made from 1955 to 1958. This was also the first vehicle in Japan to have a primary kick start system. Wikipedia
Also called: Yamaha 125
Bore / stroke: 52 mm × 58 mm (2.0 in × 2.3 in)
Engine: 123 cm3 (7.5 cu in) 2-stroke, air-cooled, single-cylinder
Fuel capacity: 9.5 L (2.1 imp gal; 2.5 US gal)
Power: 4.1 kW (5.5 hp) at 5000 rpm
Weight: 94 kg (207 lb) (dry)