Yamaha TDR 250 (1990-91) vs Yamaha RD 350 (1975)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | TDR 250 | RD 350 |
| Years: | 1990-91 | 1975 |
| Engine: | Two stroke, parallel twin cylinder, read valve, YPVS | Two stroke, parallel twin cylinder, reed valves |
| Capacity: | 249 cc / 15.2 cu-in | 347 cc / 21.1 cu-in |
| Bore x Stroke: | 56.4 х 50 mm | 64 х 54 mm |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 5.9:1 | 6.6:1 |
| Lubrication: | Autolube | Autolube |
| Induction: | 2x 28mm TM28SS Mikuni carburetors | 2, Mikuni VM28 SC |
| Ignition: | Transistorized | Battery, dual coils, breaker points |
| Starting: | Kick | Kick |
| Max Power: | 46 hp / 37 kW @ 10000 rpm | 39 hp / 28.5 kW @ 7500 rpm |
| Max Torque: | 3.7 kgf-m / 26.7 lb-ft @ 8500 rpm | 24.1 lb-ft / 32.6 Nm @ 7000 rpm |
| Transmission: | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Air assisted telescopic forks 7-way adjustable preload | Telescopic forks |
| Rear Suspension: | Single shock rising rate adjustable preload | Dual shocks |
| Front Brakes: | Single 320mm disc 2 piston calipers | Single 267mm disc 2 piston caliper |
| Rear Brakes: | Single 210mm disc single piston caliper | 178mm Drum |
| Front Tyre: | 110/90-18 | 3.00-18 |
| Rear Tyre: | 120/80-17 | 3.25-18 |
| Dimensions: | Length 2145 mm / 84.4 in Width 785 mm / 30.9 in Height 1215 mm / 47.8 in | Length 2057.4mm / 81.0 in |
| Wheelbase: | 1385 mm / 54.5 in | 1320.8 mm / 52.0 in |
| Seat Height: | 820 mm / 32.2 in | 800 mm / 31.5 in |
| Ground Clearance: | 230 mm / 9.0 in | 162.5 mm / 6.4 in. |
| Wet Weight: | 153 kg / 337 lbs | 155 kg / 342 lbs |
| Fuel Capacity: | 14 Litres / 3.6 US gal | 15.9 Litres / 4.2 gal |
| Consumption Average: | 15.9 lm/lit | 32.9 mpg |
| Standing ¼ Mile: | 13.6 sec / 152.8 km/h | 14.48 sec / 89.8 mph |
| Top Speed: | 175 km/h | 102 mph / 164 km/h |