Kawasaki KLX 450R (2008-09) vs Aprilia SMV 750 Dorsoduro (2010) vs Aprilia RX50 (2010-12) vs Yamaha XJ 600 Seca II (1992-98)
Comparison technical specifications
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| Make: | Kawasaki | Aprilia | Aprilia | Yamaha |
| Model: | KLX 450R | SMV 750 Dorsoduro | RX50 | XJ 600 Seca II |
| Years: | 2008-09 | 2010 | 2010-12 | 1992-98 |
| Engine: | Four stroke, single cylinder, DOHC, 4 valves per cylinder | Four stroke, longitudinal 90°V twin, DOHC, 4 valves per cylinder | Single cylinder, two stroke | Four stroke, inline 4 cylinder, DOHC, 8 valve |
| Capacity: | 449 cc / 27.3 cu-in | 749.9 cc / 45.7 cu-in | 49.9 cc / 3.04 cu in | 599 cc / 36.6 cub in. |
| Bore x Stroke: | 96.0 x 62.1 mm | 92 x 56.4 mm | 39.9 x 40 mm | 58.5 x 55.7 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled | Air cooled |
| Lubrication: | Forced lubrication, semi and #8209;dry sump | Wet sump | Automatic mixer | Wet sump |
| Compression Ratio: | 12.0:1 | 11.0:1 | 11.5:1 | 10.0:1 |
| Induction: | Keihin FCR | Integrated engine management system. Latest generation 3 maps (Sport, Touring, Rain) Ride-by-Wire throttle management. | Dell'Orto PVHA 17.5 carburetor | 4 x 28mm Mikuni BDST (BDS26) down-draft carburetors |
| Ignition: | Digital AC-CDI | Digital electronic, integrated with the injection, two spark plugs per cylinder | Electronic CDI | Electronic |
| Starting: | Electric & kick | Electric | Kick | Electric |
| Transmission: | 5 Speed | 6 Speed | 6 speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | Chain |
| Frame: | Aluminum, perimeter Rake / trail: 27.1 degrees / 4.6 in. | Modular steal trellis secured to albumin side plates by high steal bolts. | Steel beam | Tubular cradle |
| Front Suspension: | 48mm inverted AOS-type cartridge fork with 22-way compression damping and 20-way rebound damping | Ø43 mm Upside-down fork. | Hydraulic fork, Ø 40 mm | Telescopic fork |
| Front Wheel Travel: | 285 mm / 11.2 in | 167 mm / 6.5 in | 195 mm / 7.7 in | 140 mm / 5.5 in. |
| Rear Suspension: | UNI-TRAK® single shock system with 22-way low-speed, two-turn variable high-speed compression damping and 22-way rebound damping | Aluminium alloy swingarm with reinforcement truss. Hydraulic shock absorber adjustable in spring preload and rebound damping. | High strength steel swingarm, hydraulic monoshock | Monoshock |
| Rear Wheel Travel: | 278 mm / 10.9 in | 150 mm / 5.9 in | 180 mm / 7.1 in | 109 mm / 4.3 in. |
| Front Brakes: | Single 250mm disc 2 piston caliper | 2 x Ø320 mm discs, 4 piston caliper | Single stainless steel disc, Ø 260 mm, floating caliper | Single disc |
| Rear Brakes: | Single 240mm disc 1 piston caliper | Single Ø240 mm disc, 1 piston caliper | Single disc, Ø 180 mm, floating caliper | Single disc |
| Front Tyre: | 80/100-21 | 120/70 ZR17 | 90/90-21 | 100/80-17, Yokohama F-209 |
| Rear Tyre: | 110/100-18 | 190/55 ZR17 | 110/80-18 | 130/70-18, Yokohama R-209 |
| Dimensions: | Length 2180 mm / 85.8 in Width 820 mm / 32.3 in Height 1255 mm / 49.4 in | Length 2216 mm / 8732 in Width 905 mm / 35.6 in Height 1185 mm / 46.6 in at instrument panel | Length: 2100 mm / 82.7 in Width: 825 mm / 32.5 in | Length 2095.5 mm / 82.5 in Width 749 mm / 29.5 in Height 1171 mm / 46.1 in |
| Seat Height: | 940 mm / 37.0 in | 870 mm / 34.2 in | 880 mm / 34.6 in | 777 mm / 30.6 in |
| Fuel Capacity: | 8 Litres / 2.1 US gal | 12 Litres / 3.17 US gal | 7 L / 1.85 US gal | 17.4 Litres / 4.6 US gal |