| MODEL | YAMAHA TX 650 1973 - 1974 |
| Year | 1973 - 1974 |
| 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 | 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 |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shock absorbers |
| Front Brakes | Single disc |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2175 mm / 85.6 in |
| Overall Width | 905 mm / 35.0 in |
| Overall Height | 1135 mm / 44.7 in |
| Seat Height | — |
| Wheelbase | 1410 mm / 55.5 in |
| Ground Clearance | 150 mm / 5.5 in |
| Dry Weight | 191 kg / 420 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.50-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 12.5 Litres / 3.3 US gal |
| Fuel Consumption | 5.0 L/100 km / 20 km/l / 47 US mpg |
| Top Speed | 185 km/h / 115 mph |
The TX650 was Yamaha's big air-cooled SOHC parallel twin of the early 1970s, sold in other years as the XS650. The 1973-74 model was reworked with a new frame, longer swingarm and stiffer suspension in an effort to cure the earlier bike's vague handling. Testers praised the broad powerband, gearbox and brakes, but noted a top-heavy feel and some vibration.
