| MODEL | YAMAHA YDS-1 1959 - 1961 |
| Year | 1959 - 1961 |
| Engine Type | Two stroke, piston-port, parallel twin |
| Displacement / Capacity | 247 cc / 15.0 cu in |
| Bore X Stroke | 54 x 54 mm |
| Compression Ratio | — |
| Cooling System | Air cooled |
| Max Power | 18 hp @ 7500 rpm |
| Max Torque | 5.2 kgf-m @ 6000 rpm |
| Ignition | — |
| Induction | Single carburetor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double cradle |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swingarm |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 138 kg / 309 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.00-18 |
| Rear Tyre | 3.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
Yamaha's first dedicated sports model, a tuned version of the YD-1 twin placed in a double-cradle frame instead of the older pressed-steel one. It became the template for the company's sporty two-stroke twins for roughly twenty years.
