BMW R 27 (1960-66) vs BMW K1 (1988) vs Aprilia SL 900 Shiver (2019) vs Yamaha XT660R (2006)
Comparison technical specifications
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| Make: | BMW | BMW | Aprilia | Yamaha |
| Model: | R 27 | K1 | SL 900 Shiver | XT660R |
| Years: | 1960-66 | 1988 | 2019 | 2006 |
| Engine: | Four stroke, single cylinder, pushrod operated, OHV, 2 valves per cylinder. | Four-stroke, horizontal in line four cylinder, DOHC, 4 valves per cylinder | Four stroke, longitudinal 90°V twin, DOHC, with mixed gear/chain timing system,4 valves per cylinder | Four stroke, single cylinder, SOHC, 4 valve |
| Capacity: | 247247 cc / 15.1 cu in. | 987 cc / 60.2 cu in | 896.1 cc / 54.6 cu-in | 659 cc/ 40.2 cu-in |
| Bore x Stroke: | 68 x 68 mm | 67 x 70 mm | 92 x 67.4 mm | 100 x 84 mm |
| Compression Ratio: | 8.2:1 | 11.0:1 | 11.5:1 | 10.0: 1 |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled | Liquid cooled |
| Induction: | 1x Bing carburettor type 1/26/68 | Electronic injection, Bosch Motronic | Integrated engine management system. Injection with 3-map Ride-by-wire throttle valve opening management (Sport, Touring, Rain) | Fuel injection, 44 mm throttle body |
| Starting: | Kick | Electric | Electric | Electric |
| Max Power: | 13.4 kW / 18 hp @ 7400 rpm | 72.9 kW / 100 hp @ 8000 rpm (rear tyre: 70.1 k/w / 94.0 hp @ 8400 rpm) | 70.0 kW / 95.2 hp @ 8750 rpm | 33.8 kW / 48 hp @ 6000 rpm |
| Transmission: | 4 Speed | 5 Speed | 6 Speed | 5 Speed |
| Final Drive: | Shaft | Shaft | Chain | Chain |
| Front Suspension: | Telescopic fork | Telescopic fork with hydraulic shock absorber | Upside-down fork, stanchions Æ 41, with adjustable hydraulic rebound damping and spring preload. | 43 mm Telescopic forks, |
| Rear Suspension: | Long swing arm with suspension units and oil pressure dampers | Monolayer swinging arm | Aluminum alloy swingarm with stiffening truss. Hydraulic shock absorber with adjustable extension and spring preload. | Oscillating arm standard Monocross. 200mm wheel travel |
| Front Brakes: | ∅160mm Drum | 2 x ∅305mm discs, 4 piston calipers | 2 x Ø320 mm discs, stainless steel floating discs. Radial, four- piston callipers. Metal braided brake line. Continental two-channel ABS system. | Single 298mm disc 2 piston caliper |
| Rear Brakes: | ∅160mm Drum | Single ∅285mm disc, 1 piston caliper | Single Ø245 mm stainless steel disc, Single piston calliper. Metal braided line | Single 245mm disc 1 piston caliper |
| Front Tyre: | 3.25 x 18" | 120/70 ZR17 | 120/70 ZR17 | 90/90- 21 |
| Rear Tyre: | 3.25 x 18" | 160/60 ZR18 | 180/55 ZR17 | 130/80–17 |
| Fuel Capacity: | 15 liters / US 3.9 gal | 22 L / 5.8 US gal | 15 Litres / 3.9 US gal | 15 Litres / 3.3 US gal |