| MODEL | YAMAHA XS 650 1973 |
| Year | 1973 |
| Engine Type | Four-stroke, parallel twin, 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 BS38 carburetors |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| 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 lbs |
| 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 1973 XS 650 (TX650 in some listings) is the classic Yamaha parallel twin in its early carburetted form. Per Wikipedia the intake cam timing was made milder this year to comply with US emissions rules. It still uses a single front disc and rear drum.
