Yamaha TX 650-III (1980) vs Yamaha SR 400 (2010-11) vs Yamaha TDR 250 (1989) vs Yamaha XMAX 125 (2006-08) vs Yamaha WR 250R (2014) vs Yamaha MT 25 (2017-18) vs Yamaha YZF R6S (2008-09) vs Yamaha YBR 125 (2010-)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | TX 650-III | SR 400 | TDR 250 | XMAX 125 | WR 250R | MT 25 | YZF R6S | YBR 125 |
| Years: | 1980 | 2010-11 | 1989 | 2006-08 | 2014 | 2017-18 | 2008-09 | 2010- |
| Engine: | Air cooled, four stroke, parallel twin cylinder. | Four stroke, single cylinder, SOHC, 2 valves per cylinder. | Liquid cooled, two stroke, parallel twin cylinder, read valve, | Four stroke, single cylinder | Four stroke, single cylinder, DOHC, 4 valve | Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. | Four stroke, single cylinder, SOHC, 2 valves |
| Capacity: | 653 | 399 cc / 24.3 cu-in | 249 | 124 cc / 7.6 cu-in | 249 cc / 15.2 cub in. | 249 cc / 15.1 cu-in | 599 cc / 36.5 cu-in | 124 cc / 7.6 cu-in |
| Bore x Stroke: | 75 х 74 mm | 87 х 67.2 mm | 56.4 х 50 mm | 52 x 58.6 mm | 77 x 53.6 mm | 60 x 44.1 mm | 67 x 42.5 mm | 54 x 54 mm |
| Compression Ratio: | 8.4:1 | 8.5:1 | 5.9:1 | 11.2:1 | 11.8:1 | 11.6:1 | 12.8:1 | 10.0:1 |
| Induction: | 2x 30.+mm Mikuni | Fuel injection | 2x 28mm Mikuni carbs | Fuel Injection | Electronic fuel injection | Electronic Fuel Injection | Fuel Injection | Fuel infection |
| Max Power: | 50 hp @ 7500 rpm | 27 hp / 17.1 KW @ 7000 rpm | 46 hp @ 9500 rpm | 13.8 hp / 10.1 kW @ 8750 rpm | 22.6 kW / 30.7 hp @ 10,000 rpm | 26.5 kW / 36 PS @ 12000 rpm | 127 hp / 94.7 kW @14500 rpm | 10.1 hp / 7.4 kW @ 7800 rrpm |
| Max Torque: | 5.3 kgf-m @ 5500 rpm | 27.4 Nm / 6.3 kgf-m @ 6500 rpm | 3.6 kgf-m @ 8000 rpm | 11.33 Nm / 8.4 lb-ft @ 6500 rpm | 23.7 Nm / 2.42 kgf-m / 17.48 @ 8000 rpm | 22.1 Nm / 16.7 lb-ft @ 10000 rpm | 66 Nm / 48.6 lb-ft @ 1100 rpm | 10 Nm @ 7400 rpm |
| Front Suspension: | Telescopic fork | Air assisted telescopic forks7-way adjustable preload, | Hydraulic telescopic fork | Telescopic forks | Telescopic forks; | 41mm upside down forks with 2-way compression damping adjustable | Telescopic forks | |
| Rear Suspension: | Dual shocks | Single shock rising rate adjustable preload, | Hydraulic unit swing | Swingarm link suspension | KYB® single shock. swinging arm | Fully adjustable rear shock absorber with 2-way compression damping | Bottom link swingarm | |
| Front Brakes: | 2x 297mm discs | Single disc | Single 320mm disc 2 piston calipers | Single 267mm disc | Single 250mm disc | Single 298mm disc 2 piston caliper | 2x 320mm discs | Single 245mm disc |
| Rear Brakes: | Drum | Drum | Single 210mm disc single piston caliper | Single 240mm disc | Single 230mm disc | Single 220mm disc 2 piston caliper | Single 220mm disc | Drum |
| Front Tyre: | 3.50-19 | 3.50-19 | 110/90-18 | 120/70-M15 | 80/100 -21 | 110/70-17M/C 54H | 120/70 ZR17 | 90/90-M21 |
| Rear Tyre: | 4.00-18 | 4.00-16 | 120/80-17 | 140/70-M14 | 120/80 -18 | 140/70-17M/C 66H 5.1 in of trave | 180/55 ZR17 | 90/90-M18 |
| Fuel Capacity: | 17 Litres | 12 Litres / 3.2 gal | 13.6 Litres | 12.5 Litres / 3.3 gal | 7.6 Litres | 14 Litres / 3.7 US gal | 17.5 Litres / 4.6 US gal | 12 Litres / 3.4 US gal |