Suzuki GS 425 (1978) vs Suzuki GSX 250E (1980) vs Suzuki GS 400 (1978) vs Yamaha TT 500 (1976 - 77) vs Suzuki SP 370 (1978)
Comparison technical specifications
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| Make: | Suzuki | Suzuki | Suzuki | Yamaha | Suzuki |
| Model: | GS 425 | GSX 250E | GS 400 | TT 500 | SP 370 |
| Years: | 1978 | 1980 | 1978 | 1976 - 77 | 1978 |
| Engine: | Four stroke, parallel twin cylinder, DOHC, 2 valves per cylinder. | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder | Four stroke, parallel twin cylinders, DOHC, 2 valve per cylinder. | Four stroke, single cylinder | Four stroke, single cylinder, SOHC |
| Capacity: | 423 cc / 25.8 cu in | 249 cc / 15.2 cu in | 398 cc / 24.2 cu-in | 499 cc / 30.4 cu-in | 369 cc / 22.5 cu in |
| Bore x Stroke: | 67 x 60 mm | 60 х 44.2 mm | 65 x 60 mm | 87 х 84 mm | 85 x 65.2 mm |
| Compression Ratio: | 9.1:1 | 10.5:1 | 9:1 | 9.0 :1 | 8.9:1 |
| Cooling System: | Air cooled | Air cooled | Air cooled | Air cooled | Air cooled |
| Induction: | 2 x 34 mm Mikuni carburetors | 2 x 30mm Mikuni BS30SS carburetors | 2 x Mikuni BS34 carburetors | 38mm Mikuni | 1 x 32mm Mikuni BS32SS carburetor |
| Starting: | Electric and kick | Electric | Electric and kick-start. | Kick | Kick |
| Max Power: | 29.8 kW / 40 hp @ 7000 rpm | 21.6 kW / 29 hp @ 10000 rpm | 25.4 kW / 34 hp / @ 8000 rpm | 27 hp / 19.7 kW @ 5900 rpm | 18.5 kW / 24.8 hp @ 7500 rpm |
| Final Drive: | Chain | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic fork | Telescopic forks | Telescopic, coil spring, oil damped | Telescopic fork | Telescopic fork, oil/gas damped |
| Rear Suspension: | Twin shocks, coil spring over | Swinging arm, dual dampers, 5-way spring preload | Swing arm, coil spring (5-way adjustable), oil damped | Swinging arm | Full floater, swingarm |
| Front Brakes: | Single disc, 11in | Single 275mm disc | Single 270 mm disc, 1 piston caliper | Drum | 150 mm Drum |
| Rear Brakes: | Drum, 7 in | Drum | 160mm Drum | Drum | 150 mm Drum |
| Front Tyre: | 3.00-18 | 3.60-18 | 3.00-18 | 3.00-21 | 3.00 -21 |
| Rear Tyre: | 3.75-18 | 4.10-18 | 3.50-18 | 4.60-18 | 4.00 -18 |
| Dry Weight: | 173 kg / 382 lbs | 154 kg / 340 lbs | 172 kg / 378 lbs | 118.8 kg / 262 lbs | 123 kg / 271 lbs |