Comparison of Kawasaki KX 450F 2017 and Yamaha YZ450FX 2018 [S]ave
| Attribute |  Yamaha YZ450FX 2018 × |  Kawasaki KX 450F 2017 × |
|---|---|---|
| General | ||
| Production from (year) | 2018 | 2017 |
| Make | Yamaha | Kawasaki |
| Model | Yamaha YZ450FX | Kawasaki KX 450F |
| Category | Enduro / offroad | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Valves per cylinder | 4 | 4 |
| Fuel system | Injection. Keihin 44mm | Injection. 43mm Keihin throttle body |
| Engine details | Titanium valves | - |
| Displacement (cm³) | 449.7 | 449 |
| Cooling system | Liquid | Liquid |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 97 | 96 |
| Stroke (mm) | 60.8 | 62.1 |
| Gearbox | 5-speed | 5-speed |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) | Double Overhead Cams/Twin Cam (DOHC) |
| Driveline | O-ring chain | - |
| Ignition | TCI | Digital DC-CDI |
| Clutch | Wet multi-disc | Wet multi-disc |
| Lubrication system | Wet sump | Forced lubrication, semi and #8209;dry sump |
| Compression | 12.5:1 | 12.8:1 |
| Chassis | ||
| Front suspension | KYB® spring-type fork with speed sensitive damping; fully adjustable | 49 mm inverted Separate Function front Fork Air - Triple Air Chamber (SFF-Air TAC). Compression damping: 22-way. Rebound damping: 20-way |
| Rear suspension | KYB® single shock; full adjustable | Uni-Trak. Compression damping: 19-way (low-speed), 4-turns or more (high-speed). Rebound damping: 22-way. Spring preload: Fully adjustable |
| Front brakes | Single disc. Hydraulic | Single disc. Petal disc with 2-piston caliper |
| Rear brakes | Single disc. Hydraulic | Single disc. Petal disc with single-piston caliper |
| Diameter (mm) | 245 | 240 |
| Frame type | Aluminum Bilateral Beam frame | Perimeter, aluminium |
| Front tyre | 90/90-21 | 80/100-21 |
| Rear tyre | 120/90-18 | 120/80-19 |
| Wheels | Dunlop® AT81F tyres | - |
| Front wheel travel (mm) | 310 | 305 |
| Rear wheel travel (mm) | 318 | 305 |
| Rake (fork angle) (degree) | 28 | 26.9 |
| Other | ||
| Starter | Electric | Kick |
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 2,164 | 1,495 |
| Kerb weight (kg) | 118.8 | 108.8 |
| Overall height (mm) | 1,290 | 1,280 |
| Overall length (mm) | 2,174 | 2,195 |
| Overall width (mm) | 826 | 820 |
| Seat height (mm) | 965 | 950 |
| Ground clearance (mm) | 335 | 335 |
| Performance | ||
| Fuel capacity (l) | 7.57 | 6.21 |
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