Yamaha RA31/A, 1967-1968, 125 ccm

The RA31/A was the first V-four 125 ccm racer Yamaha ever made.

Bore x stroke were 35 x 32,4 mm which gave 124,7 ccm. The latest version gave 42 PS/16.500/17.000 rpm. Topspeed was 225 km/h! Gearbox was 9-speed and with the narrow tyres (front 2.50-18 and rear 2.75-18) weight was only about 91,5 kg. Carburetors wre 22 mm.

Yamaha RA31