| MODEL | YAMAHA YDS-2 1962 - 1963 |
| Year | 1962 - 1963 |
| Engine Type | Air-cooled, 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 | 23 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 | — |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swing arm |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1290 mm |
| 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 | — |
The YDS-2 was Yamaha's second-generation 250 cc sports twin, carrying on the air-cooled, piston-port two-stroke twin layout and five-speed gearbox that made the YDS line popular. It was a lightweight, quick road bike for its day and the step between the original YDS-1 and the later YDS-3.
