During the 1960's many framebuilders tried to improve on Japanese chassis design by offering complete framesets.

The factory version of the mighty Yamaha TZ750 were first called Yamaha TZ750R and later Yamaha YZR750.

The Yamaha TZ700/750, the"beast" originally has a 64 x 54 bore stroke (694,5 ccm) but already later in 1973 this was changed into 66,4 x 54 mm (747,6 ccm).

The Yamaha RA75 125 ccm was the last version of the RA41 single cylinder machine. It was built in 1963.

Here is a similar list as for the up to 1968 racers, but now for the racers up to, let us say, the Kenny Roberts period (1980).

As you have seen so many different factory racing bikes now, here is a chronological of the machines of the first period, up to 1968.