| MODEL | YAMAHA GX 250SP 1978 |
| Year | 1978 |
| Engine Type | Four stroke parallel twin-cylinder, OHC, 2 valves per cylinder |
| Displacement / Capacity | 248 cc |
| Bore X Stroke | 55 x 52.4 mm |
| Compression Ratio | 9.6:1 |
| Cooling System | Air cooled |
| Max Power | 25 hp @ 9500 rpm |
| Max Torque | 1.9 kgf-m @ 8500 rpm |
| Ignition | — |
| Induction | Carburetor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | — |
| Final Drive | Chain |
| 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 | 168 kg |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00-18 |
| Rear Tyre | 3.25-18 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
The SP was a variant of the GX 250 sold in 1978, sharing its air-cooled OHC parallel twin and six-speed gearbox. The source lists the same figures as the standard bike, so the difference was presumably in trim or styling.
