| MODEL | YAMAHA GX 750 1978 - 1979 |
| Year | 1978 - 1979 |
| Engine Type | Four stroke, transverse three cylinder, DOHC |
| Displacement / Capacity | 747 cc / 45.5 cu in |
| Bore X Stroke | 68 x 68.6 mm |
| Compression Ratio | 8.5:1 |
| Cooling System | Air cooled |
| Max Power | 50 kW / 67 hp @ 7000 rpm |
| Max Torque | 6.3 kgf-m @ 6500 rpm |
| Ignition | Battery point |
| Induction | Mikuni Thorex SU type BS34 carburetors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | — |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shocks |
| Front Brakes | Single disc |
| Rear Brakes | Single disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 229 kg / 502.6 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | F3.25-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 17 Litres / 4.5 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The later GX 750 kept the shaft-driven air-cooled triple. Export XS750 versions of these years gained electronic ignition, constant-velocity carburetors and a higher rev limit, and 1979 models received tubeless cast wheels and lost the kickstarter, per Wikipedia.
