Yamaha SR 400 (1998-03) vs BMW F 900R Force (2021)
Comparison technical specifications
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| Make: | Yamaha | BMW |
| Model: | SR 400 | F 900R Force |
| Years: | 1998-03 | 2021 |
| Engine: | Four stroke, single cylinder, SOHC, 2 valves per cylinder. | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 399 cc / 24.3 cu-in | 895 cc / 54.6 cu-in |
| Bore x Stroke: | 87 х 67.2 mm | 86 x 77 mm |
| Compression Ratio: | 8.5:1 | 13.1:1 |
| Cooling System: | Air cooled | Liquid cooled |
| Induction: | BSR33 carburetor | Electronic injection |
| Ignition: | CDI | Electronic |
| Starting: | Kick | Electric |
| Clutch: | Wet, Multiple Disc | Multiple-disc wet clutch (anti hopping), mechanically operated |
| Transmission: | 5 Speed | Constant mesh 6-speed gearbox integrated in crankcase |
| Final Drive: | Chain | Endless O-ring chain with shock damping in rear wheel hub |
| Frame: | Steel Double Cradle | Bridge-type frame, steel shell construction |
| Front Suspension: | Telescopic fork | 43mm Upside-down telescopic fork |
| Front Wheel Travel: | 111 mm / 4.3 in | 135 mm / 5.3 in |
| Rear Suspension: | Dual shocks | Cast aluminium dual swing arm, central spring strut, spring pre-load hydraulically adjustable, rebound damping adjustable |
| Front Brakes: | Single disc | 2X 320mm floating discs, 4-piston radial brake calipers |
| Rear Brakes: | Drum | Single 265mm discs, single-piston floating caliper |
| Front Tyre: | 3.50-19 | 120/70 ZR 17 |
| Rear Tyre: | 4.00-16 | 180/55 ZR 17 |
| Wheelbase: | 1410 mm / 55.5 IN | 1518 mm / 59.7 in |
| Seat Height: | 790 mm / 30.9 in | 815 mm / 32.0 in (OE suspension lowering kit: 770 mm, OE low seat: 790 mm, OA high seat: 835 mm, OA comfort seat: 840 mm, OE extra high seat: 865 mm) |
| Wet Weight: | 174 kg / 384 lbs | 211 kg / 465 lbs |
| Fuel Capacity: | 12 Litres / 3.2 gal | 13 Litres / 3.4 US gal |