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 first 700 ccm machines were claimed to have 80 PS at 10.500 rpm, the 750 ccm version (TZ750A) had already 100 ps at 10.500 rpm. carburetors were Mikuni VM34SC's.

Yamaha TZ700 1973 YMENV Workshop