Yamaha TZ700
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In 1974, Yamaha came out with its first-born 2-stroke, four-cylinder production road racer. The TZ700 was a 90 hp, 694cc engine that had the same 64mm bore size as the TZ350 and RD350. It had twin shock rear suspension. In 1975, cylinder bore was increased to 66.4mm yielding 747cc, producing about 15 more hp. The rear suspension was also upgraded to Monoshock.