BMW R 68 SDT Special (1952-55) vs BMW R 50 US (1967-69) vs Hyosung GT 650S (2009-11) vs Kawasaki KLE 500 (1999-00) vs Yamaha TT-R 225 (2001-02)
Comparison technical specifications
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| Make: | BMW | BMW | Hyosung | Kawasaki | Yamaha |
| Model: | R 68 SDT Special | R 50 US | GT 650S | KLE 500 | TT-R 225 |
| Years: | 1952-55 | 1967-69 | 2009-11 | 1999-00 | 2001-02 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, 90° V twin, DOHC, 4 valve per cylinder | Four stroke, parallel twin Cylinder, DOHC, 4 Valves per cylinder | Four stroke, single cylinder, SOHC, 2 valve |
| Capacity: | 594 cc / 36.2 cu in | 494 cc / 30.1 cu in. | 647 cc / 39.4 cu-in | 498 cc / 30.4 cu-in | 223 cc / 13.6 cu-in |
| Bore x Stroke: | 72 x 73 mm | 68 x 68 mm | 81.5 x 62 mm | 74 x 58 mm | 70 x 58 mm |
| Compression Ratio: | 8.0:1 | 7.5:1 | 11.4:1 | 10.8:1 | 9.5: |
| Cooling System: | Air cooled | Air cooled | Liquid cooled | Liquid cooled | Air cooled |
| Induction: | 2 x Bing 1/26/9 - 1/26/10 carburetors | 2 x Bing 1/24/45 - 1/24/46 carburetors | Electronic fuel Injection | 2x 34mm Keihin carburetors | 26mm Teikei carburetor |
| Ignition: | Magneto ignition | Battery ignition | Digital CDI | CDI | CDI |
| Starting: | Kick | Electric & kick | Electric | Electric | Electric |
| Max Power: | 26.1 kW / 35 hp @ 7000 rpm | 19.4 kW / 26 hp @ 5800 rpm | 76.4 hp / 58.8 kW @ 9000 rpm | 44.8 hp / 33 kW @ 8500 rpm | NA |
| Transmission: | 4 Speed | 4 Speed | 6 Speed | 6 Speed | 6 Speed |
| Front Suspension: | Telescopic front fork with hydraulic damping; plunger type | Telescopic fork | 41mm Oil upside down forks | 41mm Telescopic forks air assisted | Telescopic forks |
| Rear Suspension: | Spring with coil compression springs and rubber deflection stops | Long swing arm with suspension units and oil pressure shock absorbers | Swinging arm | Steal awing arm with preload adjustment | Link Type single shock |
| Front Brakes: | ∅200mm Drum duplex full hub | ∅200mm Drum, duplex full hub | 2x 300mm discs | Single 300mm disc 2 piston caliper | Single 229mm disc |
| Rear Brakes: | ∅200mm Drum simplex full hub | ∅200mm Drum, simplex full hub | Single 230mm disc | Single 230mm disc 1 piston caliper | Drum |
| Front Tyre: | 3.50 - 19" | 3.50 -18" | 120/60 -17 | 90/90 VR21 | 80/100-21 |
| Rear Tyre: | 3.50 - 19" | 4.00 -18" | 160/60 -17 | 130/80 VR17 | 100/100-18 |
| Fuel Capacity: | 17 liters / 4.4 US gal | 17 liters / 4.49 US gal | 17 Litres / 3.1 US gal | 15 Litres / 3.9 US gal | 10.2 Litres / 2.7 US gal |