Quote:
Originally Posted by John.
 Right enough, I remember now you mentioned it(ZRX) in another thread?
The TX will be the ZRX of it's day yes/no?
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It was Yamaha's first attempt at a 750cc big bike, the writing was on the wall for 2 strokes in the USA in the early 70's so they went with the then norm and created a 2 cylinder 360 degree parallel twin 4 stroke engine unlike Honda which had released a 4 cylinder in 1968/9, Yamaha reasoning was that 2 cylinders are narrower than 4 and lighter.
It was just that they complicated things by using counter balancing weights trying to get round the inherent vibration issues with a parallel twin (think classic British like Triumph or BSA).
Yamaha never followed the norm in the 70's as later they released a 3 cylinder 750 (1976) and also a 500cc 180 degree twin with DOHC and 4 valves per cylinder (1973) also with counter balancing weights, all driven by chain, which I believe was a first for a production engine in a motorcycle (DOHC, 4 valve head, balancing shafts).