Lot details Registration No: N/A Frame No: T.B.A. Engine No: T.B.A. cc: 347 MOT Expiry Date: N/A
During the 1972 season the Yamaha's works riders campaigned machines in the 250 and 350cc classes that utilised liquid cooling and which acted as prototypes for the following seasons production racers. The liquid cooling employed on the new TZ's sought to address the achilles heel of the TR3/TD3 air cooled racers - their propensity to "nip-up" and established a line of of racing machinery whose success is unparralled in motorcycle road racing history. The "A" series models newly developed engine was housed in a set of cycle parts that were essentially the same as those employed by the previous aircooled racers with drum brakes and twin rear shock absorbers. The subsequent years "B" series machines continued in much the same way, however a major revision occurred 1976 with the introduction of the "C" series.
The new models employed a monoshock rear end and front and rear disk brakes. The engine had benefitted from the ongoing development of the works supported bikes resulting in the 250cc producing 52bhp whilst the 350cc machine had gained 4bhp. Subsequent development was limited to detail changes until the the much needed introduction of the F in 1979, a consequence of Yamaha's R&D resources being comitted to the development of new road models. The F adopted a revised frame with an alloy cantilver swinging arm and revised front forks . The most significant change to the engine was the adoption of six port cylinders for the 350cc model, which with other changes resulted in an eight horsepower increase in comparision to the previous E variant. This combined with the better handling dlivered by the new chassis and the reduction of weight that had been acheived kept the TZ at the head of the field.
We are informed by the vendor that this late example was used by Gary Cowan to establish a lap record at the Ulster Grand Prix that still stands and win a number of other races. Presented to a high standard it would be a fine addition to any collection.
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