BMW R4 Series 2 vs Yamaha SR400 (2019)
Side-by-side spec comparison, pricing, and a plain-English breakdown of how the BMW R4 Series 2stacks up against the Yamaha SR400. Numbers pulled from manufacturer spec sheets — click either bike for the full review.
Spec comparison
| Spec | BMW R4 Series 2 | Yamaha SR400 |
|---|---|---|
| Model year | 1933 | 2019 |
| Price | — | — |
| Engine | 398 cc | 399 cc |
| Horsepower | 12 hp | 23 hp |
| Torque | — | 27 Nm |
| Seat height | — | 31 mm |
| Fuel capacity | 2.6 L | 3.2 L |
| Fuel type | petrol | petrol |
| Transmission | — | 5-speed |
| Front brakes | Expanding brake (drum brake) | Single disc. Hydraulic. |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Tires | 3.50-26.00 / 3.50-26.00 | 90/100-18 / 110/90-18 |
BMW R4 Series 2 vs Yamaha SR400 — which should you buy?
Picking between the BMW R4 Series 2 and the Yamaha SR400 usually comes down to the numbers you care about most. On paper, the BMW R4 Series 2 brings 12 hp, while the Yamaha SR400 counters with 23 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: