| MODEL | YAMAHA TX 650 1975 - 1976 |
| Year | 1975 - 1976 |
| Engine Type | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder |
| Displacement / Capacity | 653 cc / 39.8 cu in |
| Bore X Stroke | 75 x 74 mm |
| Compression Ratio | 8.4:1 |
| Cooling System | Air cooled |
| Max Power | 39.5 kW / 53 hp @ 7200 rpm |
| Max Torque | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm |
| Ignition | Battery, induction coil |
| Induction | 2 x Mikuni carburettors |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5 Speed |
| Clutch | Multi-plate wet |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double downtube with single large-diameter backbone, gusseted |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shock absorbers |
| Front Brakes | Single hydraulic disc |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2179 mm / 85.8 in |
| Overall Width | 899 mm / 35.4 in |
| Overall Height | 1161 mm / 45.7 in |
| Seat Height | — |
| Wheelbase | 1435 mm / 56.5 in |
| Ground Clearance | 150 mm / 5.5 in |
| Dry Weight | 191 kg / 420 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.50H-19 4PR |
| Rear Tyre | 4.00H-18 4PR |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 4.0 US gal |
| Fuel Consumption | 5.0 L/100 km / 20 km/l / 47 US mpg |
| Top Speed | 185 km/h / 115 mph |
These later 650 twins kept the proven air-cooled SOHC engine and the revised, braced frame introduced on the TX650A. The tank grew to 15 litres and the bike gained electric starting alongside the kickstarter. It remained a smooth, torquey standard with a single front disc and rear drum, but was still criticised as top-heavy and a little buzzy.
