Yamaha XJ 600N (2001-04) vs Suzuki TU 250X (2005-07) vs BMW R 25/3 (1953-56) vs Kawasaki KDX 200 (1983) vs Kawasaki Z 650SE (2020) vs Ducati GT 1000 Classic (2009)
Comparison technical specifications
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| Make: | Yamaha | Suzuki | BMW | Kawasaki | Kawasaki | Ducati |
| Model: | XJ 600N | TU 250X | R 25/3 | KDX 200 | Z 650SE | GT 1000 Classic |
| Years: | 2001-04 | 2005-07 | 1953-56 | 1983 | 2020 | 2009 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder | Four stroke, single cylinder, SOHC, 4 valves | Four stroke, single cylinder, pushrod operated, OHV, 2 valves per cylinder. | Two stroke, single cylinder, reed valve | Four stroke, parallel twin cylinder. DOHC, 4 valves per cylinder. | Four stroke, 90° “L” twin cylinder, desmodromic 2 valves per cylinder, operated by four rocker arms (two opening rockers and 2 closing rockers) SOHC. Driven by the crankshaft through spur gears, timing belt pulleys and toothed timing belts |
| Capacity: | 599 cc / 36.5 cu-in | 249 cc / 15.2 cu-in | 247 cc / 15.1 cu in. | 198 cc / 12.0 cu-in | 649 cc / 39.65 cu /in | 992 cc / 60.5 cu in |
| Bore x Stroke: | 58.5 x 55.7 mm | 72 x 61.2 mm | 68 x 68 mm | 66 x 58 mm | 83 x 60 mm | 94 x 71.5 mm |
| Cooling System: | Air cooled | Air/oil-cooled | Air cooled | Air cooled | Liquid cooled | Air cooled |
| Compression Ratio: | 10:1 | 9.0:1 | 6.5:1 | 7.7:1 | 10.8:1 | 10.0:1 |
| Induction: | 4x 28mm Mikuni BDS28 downdraft carburettors | EFI | 1x Bing type 1/24/41or SAWE type K24F | 32mm Mikuni carburetor | DFI® with Keihin 36mm Keihin throttle bodies | Marelli electronic fuel injection, 45mm throttle body |
| Ignition: | Transistor | Electronic ignition (fully transistorized) | Battery ignition | CDI | TCBI with electronic advance | Marelli electronic |
| Starting: | Electric | Electric | Kick | Kick | Electric | Electric |
| Max Power: | 61 hp / 45 kW @ 8.500 rpm | 15 kW / 20 hp @ 8000 rpm | 9.7 kW / 13 hp @ 5600 rpm | 37 bhp / 28 kW @ 9500 rpm | 50.2 kW / 67.3 hp @ 8,500 rpm | 61 kW / 81.8 hp @ 8,000 rpm |
| Transmission: | 6 Speed | 5 Speed | 4 Speed | 6 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Shaft | Chain | Sealed chain | Chain, gear ration:15/39 |
| Front Suspension: | 38mm Telescopic forks, no adjustment | Telescopic, hydraulic dampers, coil springs | Telescopic fork | 43mm Kayaba telescopic forks | 41 mm hydraulic telescopic fork | 43 mm Marzocchi upside down fork |
| Rear Suspension: | Monocross monoshock adjustable for preload | Swinging arm, hydraulic dampers, coil springs | Telescopic suspension | Single shock adjustable for compression rebound and spring preload | Horizontal Back-link with adjustable preload | Twin shock absorbers, spring preload |
| Rear Brakes: | Single 245mm disc 2 piston caliper | Drum | ∅160mm Drum | 110mm drum | Single 220mm disc | Single 245 mm disc, 2 piston caliper |
| Front Tyre: | 110/80H17 | 90/90-18 | 3.25 x 19" | 80/100-21 | 120/70 -17 | 120/70 ZR17 |
| Rear Tyre: | 130/70H18 | 110/90-18 | 3.25 x 18" | 110/100-18 | 160/50 -17 | 180/55 ZR17 |
| Fuel Capacity: | 17 Litres / 4.4 US gal | 12 Litres / 3.2 US gal / 2.6 Imp gal | 12 L / 3.1 US gal | 11 Litres / 3.9 US gal | 15 Litres / 4.0 US gal | 15 Litres / 4.0 US gal / 3.3 Imp gal |