The 449 cc engine single-cylinder got a new fuel-system for more torque at lower revs. The chassis components remained mostly unchanged, but the KX450F has a new Uni-Trak suspension system for racing riders at the rear, while the front of the Kawa has a Kayaba AOS fork with separate oil and air functions. The digital fuel injection system includes the small ECU which requires no battery, thus reducing weight.
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Kawasaki KX 450 F 
2011 
The Kawasaki KX 450 F 2011
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Engine and transmission
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| Engine type: | 1 cylinders, 4-stroke, Single |
| Displacement: | 449 cc (27.43 cubic inches) |
| Bore × stroke: | 3.78 inch × 2.44 inch (oversquare - shortstroke) |
| Cooling system: | Water cooled |
| Throttle: | Cable operated |
| Valves | |
| Valve train: | DOHC, variable |
| Valves per cylinder: | 4 |
| Fuel and ignition | |
| Sparks per cylinder: | 1 |
| Fuel supply system: | Carburetor |
| Ignition type: | Digital CDI |
| Funnel diameter: | 1.57 inch |
| Compression: | 12:1 |
| Engine mounting: | Transverse |
| Lubrication system: | Wet sump |
| Gear box: | Manual 5-speed |
| Clutch: | Wet, multiple discs, cable operated |
| Final drive: | Chain |
| Spark plug pipe type: | NGK |
| Motor oil: | Synthetic, 20-50 |
| Starter: | Kick-starter |
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Dimensions
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| Physical measures | |
| Length: | 86 inch |
| Width: | 32.3 inch |
| Height: | 50.4 inch |
| Wheel base: | 58.3 inch |
| Trail: | 4.6 inch |
| Ground clearance: | 13.19 inch |
| Seat height: | 37.8 inch |
| Weight | |
| Curb weight: | 249.1 lbs |
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Chassis and suspension
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| Frame type: | aluminium, Double cradle frame |
| Front | |
| Suspension: | Cartridge - upside-down |
| Suspension travel: | 12.4 inch |
| Fork angle: | 27° |
| Brake: | Single Disk, Ø9.84 inch |
| Tire: | 90 / 100 R21 R |
| Tire pressure: | 0.07 PSI |
| Rear | |
| Suspension: | mono shock, Swingarm |
| Suspension travel: | 12.4 inch |
| Brake: | Disk, Ø9.45 inch |
| Tire: | 120 / 80 R19 R |
| Tire pressure: | 0.07 PSI |
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Other
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| ABS available: | No |
| Fuel capacity: | 1.9 gals |
| Number of riders: | 1 person |
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