To challenge the 1983 season, Yamaha presented the YZR 500(OW70). Beginning with a two-cycle, water-cooled, four-cylinder engine, the YZR500 had been designed with a good amount of innovative mechanics. Its four cylinders were divided in to an upper and lower group consisting of two cylinders each. Crankshafts were attached with each team, providing an original V-shaped design. Aided by the upper team placed at a 40 degree angle and also the lower team set nearly horizontally, it boasts a decreased center of gravity. The compactness of this motor had been further enhanced by the neat placement of the carburetor between the two sets of cylinders. The motor was equipped with Yamaha's exclusive power valve system (YPVS) and puts out over 140hp. Parting from trusted double-cradle style, Yamaha broke new ground in aluminum frame design and paved how the subsequent Deltabox framework. The asymmetrical model of the frame connects the pivot points of steering head plus the back swing arm to help make for a sturdy yet lightweight understructure. Tadahiko Taira and Keiji Kinoshita, both riding YZR motorcycles, challenged the each Japan Road Race and offered Japan a glimpse of their rate. Taira proceeded to take the 1983 Series Title and effectively defend it throughout the next 2 yrs. The pride and joy of Japanese motorcycle racing, Taira later on proceeded the process the very best in the World Grand Prix Championships.
