Yamaha RD 250 (1976) vs Suzuki RG 400 (1985-86)
Comparison technical specifications
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| Make: | Yamaha | Suzuki |
| Model: | RD 250 | RG 400 |
| Years: | 1976 | 1985-86 |
| Engine: | Two stroke, torque induction, parallel twin | Two stroke, square four cylinder, rotary valve with exhaust port valves |
| Capacity: | 247 cc / 15.0 cu-in | 397 cc / 24.2 cu in |
| Bore x Stroke: | 54 х 54 mm | 50 x 50.6 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 6.7:1 | 7.0:1 |
| Induction: | 2x Mikuni VM28 SC carburetor | 4 x 28 mm Mikuni VM28SH Flatslide carburetors |
| Ignition: | Battery and coil with breaker points | Suzuki PEI |
| Starting: | Kick | Kick |
| Max Power: | 30 hp / 22.3 kW @ 7500 rpm | 43.1 kW / 59 hp @ 9000 rpm |
| Max Torque: | 21 lb-ft / 2.9 kgf-m @ 7000 rpm | 48 Nm / 4.9 kgf-m / 35.4 lb-ft @ 8500 rpm |
| Clutch: | Wet multi-plate | Wet, 8-plate |
| Transmission: | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Telescopic forks | Air adjustable fork with 38mm tubes, adjustable spring preload and anti dive valuing. |
| Rear Suspension: | Dual shocks | Full floating system, shock absorber, adjustable for spring preload |
| Front Brakes: | Single disc | 2 x 260 mm Discs, 4-piston calipers |
| Rear Brakes: | Drum | Single 210 mm disc, 2-piston caliper |
| Front Tyre: | 3.00S-18-4PR | 110/90 V16 |
| Rear Tyre: | 3.50S-18-4PR | 120/90 V17 |
| Dimensions: | Length 2030 mm / 79.9 in Width 830 mm / 32.6 in Height 1085 mm / 42.7 in | Length: 2100 mm / 82.7 in Width: 695 mm / 27.4 in Height: 1185 mm / 46.7 in |
| Wheelbase: | 1325 mm / 52.1 in | 1425 mm / 56.1 in |
| Ground Clearance: | 150 mm / 5.9 in | 120 mm / 4.7 in |
| Dry Weight: | 152 kg / 335 lbs | 154 kg / 340 lbs |
| Fuel Capacity: | 16.5 Liters / 4.2 US gal | 22 Litres / 5.8 US gal / 4.8 Imp gal |