| Yamaha RD56 250 cc |
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Yamaha RD56, 1962-1966. The bike that gave Yamaha their first World Championships. With the RD56 and Phil Read Yamaha had its first Worldchampionship in 1964. The twin-cylinder engine had rotary valves on each side and with a bore x stroke of 56 x 50,7 mm this gave a capacity of 249,8 ccm. Compressionratio was 7.8 and this resulted in 40 PS at 11.000 rpm for the 1962 version. In 1963 this went up to 45 PS, in 1964 50 PS andthe last version had more than 55/56 PS. Gearbox was 7 speeds and topspeed an astonishing 220 km/h.
Tyres were a narrow 2.75-18 up on front and a 3.00-18 at the back. Weight was about 115 kg. This is an official studio picture of the 1964 machine that gave Yamaha its first World Championship
This is the fantastic engine which gave the Honda engineers so many nightmares....!
An early version of the RD56, from 1962-1963.
And Fumio Ito on the early version in his ride on the Isle of Man
Here is Fumio Ito with the very first version of the RD56 on (I think) Fuji Speedway.
Yamaha RD56 250 ccm, Fumio Ito
A beautiful shot of the 1965 RD56 in full colour
The same 1965 bike from the other side.
And the "naked" shot from the 1966 machine in front of the factory
The same machine in real "factory" surroundings. from the left hand side
Another studio shot from the right hand side
And finally from the left
And here is the layout from the early 1962 engine
Yamaha RD56 250 ccm 1962
And from the upgraded 1964 engine
Yamaha RD56 250 ccm 1964
This old picture is from the first RD56 machine in 1962, taken at the Suzuka circuit at the ned of 1962. (this picture is one size only because of quality)
Yamaha RD56 1962 Suzuka circuit
Here we have the fabolous engine from the left hand side
Here you see the beautifully constructed oilpump with all the different oilpipes going to all the crucial lubrication points.
And another detail (if you want to build one yourself!)
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