Yamaha RD 250 (reduced effect) vs Adler ISDT (1981)
Side-by-side spec comparison, pricing, and a plain-English breakdown of how the Yamaha RD 250 (reduced effect)stacks up against the Adler ISDT. Numbers pulled from manufacturer spec sheets — click either bike for the full review.
Spec comparison
| Spec | Yamaha RD 250 (reduced effect) | Adler ISDT |
|---|---|---|
| Model year | 1981 | 1958 |
| Price | — | — |
| Engine | 247 cc | 247 cc |
| Horsepower | 27 hp | 18 hp |
| Fuel capacity | 4.5 L | 3.2 L |
| Fuel type | petrol | petrol |
| Transmission | 6-speed | — |
| Front brakes | Single disc | — |
| Rear brakes | Expanding brake | — |
| Tires | 3.00-18 / 3.50-18 | 3.25-16 / 3.25-16 |
Yamaha RD 250 (reduced effect) vs Adler ISDT — which should you buy?
Picking between the Yamaha RD 250 (reduced effect) and the Adler ISDT usually comes down to the numbers you care about most. On paper, the Yamaha RD 250 (reduced effect) brings 27 hp, while the Adler ISDT counters with 18 hp.
Our spec tables above highlight the winning number on each line. For the full rider-focused reviews including real-world fuel economy, service costs and available colors, click into either bike: