Yamaha XS 1100 Sport (1981) vs Yamaha XT 225 Serow (1997-99) vs Yamaha XS 650 Midnight Special (1981) vs BMW R 1200RT (2006) vs Yamaha SR 400 (1998-03)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | BMW | Yamaha |
| Model: | XS 1100 Sport | XT 225 Serow | XS 650 Midnight Special | R 1200RT | SR 400 |
| Years: | 1981 | 1997-99 | 1981 | 2006 | 1998-03 |
| Engine: | Four stroke transverse four cylinder, DOHC, 2 valves per cylinder. | Four stroke, single cylinder, SOHC, 2 valve | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Four stroke, two cylinder horizontally opposed Boxer, 4 valves per cylinder | Four stroke, single cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 1101 cc / 67.2 cu-in | 223 cc / 13.6 cu-in | 653 cc / 39.8 cu in | 1170 cc / 71.4 cu in | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 71.5 x 68.6 mm | 70 X 58mm | 75 x 74 mm | 101 x 73 mm | 87 х 67.2 mm |
| Cooling System: | Air cooled | Air cooled | Air cooled | Air/Oil cooled | Air cooled |
| Compression Ratio: | 9.2:1 | 9.5:1 | 8.5:1 | 12.0:1 | 8.5:1 |
| Induction: | 4x Mikuni BS 34SS Carburettor | 34mm Mikuni carburetor | 2 x Mikuni BS34SU carburetors | BMW engine management, BMS-K | BSR33 carburetor |
| Ignition: | TCI additional vacuum adjusted! / electric kick starter - Witch is separated from the engine, for emergency mounting only | CDI | Battery, induction coil | Digital engine management | CDI |
| Starting: | Electric | Electric & Kick | Electric and kick | Electric | Kick |
| Max Power: | 95 hp / 70.8 kW @ 8500 rpm | 20 hp / 15 kW @ 8000 rpm | 39.5 kW / 53 hp @ 7200 rpm | 81kW / 110 hp @ 7500 rpm | 27 hp / 17.1 KW @ 7000 rpm |
| Max Torque: | 9.2 kgf-m / 66.5 lb-ft @ 6500 rpm | 19 Nm / 14 lb-ft @ 7000 rpm | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 5500 rpm | 115 Nm / 11.7 kgf-m / 85 lb-ft @ 6000 rpm | 27.4 Nm / 6.3 kgf-m @ 6500 rpm |
| Transmission: | 5 Speed | 6 Speed | 5 Speed | 6 Speed | 5 Speed |
| Final Drive: | Shaft | Chain | Chain | System Enclosed driveshaft with two universal joints | Chain |
| Front Suspension: | Telescopic fork. | Telescopic fork | Telescopic forks | BMW Motorrad Telelever, stanchion diameter 35mm, central spring strut, rebound damping electronically adjustable with standard ESA | Telescopic fork |
| Rear Suspension: | Dual shocks Swing arm, preload adjustable | Swingarm rebound adjustable. single shock | Dual shock absorbers | Die-cast aluminium single-sided swinging arm with BMW Motorrad EVO-Paralever, spring preload hydraulically adjustable to continuously variable levels by means of electronically adjustable ESA, rebound damping with standard ESA | Dual shocks |
| Front Brakes: | 2x 298mm discs | Single 220mm disc | Twin hydraulic discs, 267 mm | 2 x 320mm Discs, 4 piston callipers | Single disc |
| Rear Brakes: | Single 298mm disc | Single disc | Single hydraulic disc, 267 mm | Single 265mm disc, 2 piston caliper | Drum |
| Front Tyre: | 3.50-19 | 2.75-21 | 3.50S-19 | 120/70 ZR17 | 3.50-19 |
| Rear Tyre: | 4.50-17 | 120/80-18 | 130/90S-16 | 180/60 ZR17 | 4.00-16 |
| Seat Height: | 800 mm / 31.5 in | 810 mm / 31.9 in | 785 mm / 30.9" | 820 mm - 840 mm / 32.2 in - 33.0 in 780 mm - 800 mm / 30.7 - 31.4 in (special equipment low seat bench) | 790 mm / 30.9 in |
| Fuel Capacity: | 22 Litres / 5.8 gal | 9.8 Liters / 2.6 US gal | 11.5 Litres / 3.0 US gal | 27 Liters / 7.1 US gal | 12 Litres / 3.2 gal |