Yamaha YA5, Apr. '61; YDS1, Jul. '59

On the left side you see above the YA5 from April 1961 and thereunder the YA6 Deluxe model from November 1962. This new 125 cc bike was very important for Yamaha. it followed the same design route as the YD range. The YA5 was 1870 mm long, on a 1250 mm wheelbase and had a short-stroke (56 x 50 mm ) engine producing 10 hp at 6.500 rpm. Leg-shields were popular accessories at that time. The YA5 had to carry Yamaha over the difficult period with the failures of the MF1 and SC1 until the newer generation models arrived.