Yamaha GX 750 Sport (1978-79) vs Yamaha RS 100 (1978-79) vs Yamaha XS 650E (1978) vs Yamaha TT 500 (1978-81) vs Yamaha RD 250 (1978) vs Yamaha XS 750 Special (1978) vs Yamaha SR 400 (1978-80)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | GX 750 Sport | RS 100 | XS 650E | TT 500 | RD 250 | XS 750 Special | SR 400 |
| Years: | 1978-79 | 1978-79 | 1978 | 1978-81 | 1978 | 1978 | 1978-80 |
| Engine: | Four stroke, transverse three cylinder. DOHC | Two stoke, torque induction, single | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Four stroke, single cylinder | Two stroke, torque induction, parallel twin | Four stroke, transverse three cylinder, DOHC, 2 valves per cylinder. | Four stroke, single cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 747 cc / 45.5 cu-in | 97 cc / 5.9 cu-in | 653 cc / 39.8 cu in | 499 cc / 30.4 cu-in | 247 cc / 15.0 cu-in | 747 cc / 45.6 cu in | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 68 х 68.6 mm | 52 x 45.6 mm | 75 x 74 mm | 87 х 84 mm | 54 х 54 mm | 68 х 68.6 mm | 87 х 67.2 mm |
| Cooling System: | Air cooled | Air cooled | Air cooled | Air cooled | Air cooled | Air cooled | Air cooled |
| Compression Ratio: | 8.5:1 | 7.0 : 1 | 8.4:1 | 9.0 :1 | 6.7:1 | 9.5:1 | 8.5:1 |
| Induction: | Mikuni Thorex SU type BS34 | VM20SH carburetor | 2 x Mikuni BS38 carburetors | 38mm Mikuni | 2x Mikuni VM28 SC carburetor | 3 x Mikuni BS34-II constant velocity carburetors | BSR33 carburetor |
| Ignition: | Battery point | Magneto, CB/coil | Battery, induction coil | Flywheel magneto | Battery and coil with breaker points | Electronic TCI | CDI |
| Starting: | Electric | Kick | Electric and kick | Kick | Kick | Electric | Kick |
| Max Power: | 67 hp / 50 kW @ 7000 rpm | 11 hp / 8.1 kW @ 8500rpm | 39.5 kW / 53 hp @ 7200 rpm | 27 hp / 19.7 kW @ 5900 rpm | 30 hp / 22.3 kW @ 7500 rpm | 50.4 kW / 69 hp @ 8500 rpm | 27 hp / 17.1 KW @ 7000 rpm |
| Transmission: | 5 Speed | 5 Speed | 5 Speed | 5 Speed | 6 Speed | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain | Chain | Chain | Chain | Shaft | Chain |
| Front Suspension: | Telescopic forks | Telescopic forks | Telescopic forks | Telescopic fork | Telescopic forks | Telescopic forks, adjustable, 36 mm | 35mm Telescopic fork |
| Rear Suspension: | Dual shocks | Dual shocks | Dual shock absorbers | Swinging arm | Dual shocks | Dual shocks swing arm, 5-way preload adjustable | Dual shocks, 5-way adjustable preload |
| Front Brakes: | Single disc | Drum | Twin hydraulic discs, 267 mm | Drum | Single 267mm disc | 2 x 267mm Discs | Single disc |
| Rear Brakes: | Single disc | Drum | Drum | Drum | Single 267mm disc | Single 265mm disc | Drum |
| Front Tyre: | F3.25-19 | 2.75-18 | 3.50H-19 4PR | 3.00-21 | 3.00S-18-4PR | 3.25-19 | 3.50-19 |
| Rear Tyre: | 4.00-18 | 3.00-18 | 4.00H-18 4PR | 4.60-18 | 3.50S-18-4PR | 4.00-18 | 4.00-16 |
| Fuel Capacity: | 17 Litres / 4.5 US gal | 10 Litres / 2.6 US gal | 15 Litres / 4.0 US gal | 8.5 Litres / 2.24 US gal | 16.5 Liters / 4.2 US gal | 19 Litres / 5.0 US gal | 12 Litres / 3.2 gal |