Yamaha XS 650 (XS-2) (1972) vs Yamaha DT 125 (1972) vs Yamaha YDS-7 (1972) vs Yamaha RD 250 (1972) vs Yamaha TX 750 (1972)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | XS 650 (XS-2) | DT 125 | YDS-7 | RD 250 | TX 750 |
| Years: | 1972 | 1972 | 1972 | 1972 | 1972 |
| Engine: | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Two stroke, single cylinder | Two stroke, piston-port, parallel twin | Two stroke, torque induction, parallel twin | Four stroke, parallel twin cylinders, SOHC 2 valve per cylinder |
| Capacity: | 653 cc / 39.8 cu in | 123 cc / 7.5 cu-in | 247 cc / 15.0 cu-in | 247 cc / 15.0 cu-in | 743 cc / 45.3 cu-in |
| Bore x Stroke: | 75 x 74 mm | 56 х 50 mm | 54 x 54 mm | 54 х 54 mm | 80 x 74 mm |
| Compression Ratio: | 8.4:1 | 6.9:1 | 7.5;1 | 6.7:1 | 8.8:1 |
| Cooling System: | Air cooled | Air cooled | Air-cooled | Air cooled | Air cooled |
| Induction: | 2 x Mikuni BS38 carburetors | Mikuni TS28SS Carburetor | 26mm Mikuni | 2x Mikuni VM28 SC carburetor | Carburetor |
| Ignition: | Battery, induction coil | Magneto | Mitsubishi contact breaker | Battery and coil with breaker points | |
| Starting: | Kick | kick | Kick | Kick | Electric & Kick |
| Max Power: | 39.5 kW / 53 hp @ 7200 rpm | 12.9 kW / 17.3 hp @ 7000 rpm | 30 hp @7500 rpm | 30 hp / 22.3 kW @ 7500 rpm | 63 hp / 45.9 kW @ 6100 rpm |
| Max Torque: | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm | 1.4 kgf-m / 10 lb-ft @ 7000 rpm | 21 ftlb @ 7000 rpm | 21 lb-ft / 2.9 kgf-m @ 7000 rpm | 7 kgf-m / 50.6 lb-ft @ 6000 rpm |
| Transmission: | 5 Speed | 5 Speed | 5 Speed Helical-gear primary drive. Rear chain % x %in with top guard. Engine rpm at 30 mph in top gear, approximately 2,500. | 6 Speed | 5 Speed |
| Final Drive: | Chain | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic forks | Telescopic forks | 34mm Telescopic forks | Telescopic forks | Telescopic forks |
| Rear Suspension: | Dual shock absorbers | Dual shocks | Twin shock | Dual shocks | Dual shock |
| Front Brakes: | Single disc | Drum | 180mm twin leading shoe drum | Drum | Single or dual 300mm disc 2 piston calipers (In Japan, the United States, and other markets the bike had a single disc, although the lugs needed to mount a second disc were in place. ) |
| Rear Brakes: | Drum | Drum | 180mm single leading shoe | Drum | 180mm Drum |
| Front Tyre: | 3.50-19 | 2.75-21 | 300 x 18 | 3.00S-18-4PR | 3.50-19 |
| Rear Tyre: | 4.00-18 | 3.50-18 | 3.25 x 18 | 3.50S-18-4PR | 4.00-18 |
| Fuel Capacity: | 12.5 Litres / 3.3 US gal | 9.5 Litres / 2.5 US gal | 11.4 Litres / 3.0 gal | 16.5 Liters / 4.2 US gal | 14 Litres / 3.7 US gal |