Our test bike, the yamaha tx650a, uses the same basic powerplant as last year’s tx650. The narrow, very tall engine retains its slightly oversquare 75mm bore and 74mm stroke, which give … The frame was completely re-configured to fit the vertical-twin cylinder engine style of the xs-1, the wheelbase was also lengthened to contribute to increased straight-line running stability, and the trail …

Engine is four stroke, parallel twin cylinder, sohc, 2 valves per cylinder. , displacement … Complete specifications and review of the 1973 yamaha tx 650