Comparison of Kawasaki KX 450F 2018 and Yamaha YZ450F 2020 [S]ave
| Attribute |  Kawasaki KX 450F 2018 × |  Yamaha YZ450F 2020 × |
|---|---|---|
| General | ||
| Production from (year) | 2018 | 2020 |
| Make | Kawasaki | Yamaha |
| Model | Kawasaki KX 450F | Yamaha YZ450F |
| Category | Cross / motocross | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Valves per cylinder | 4 | 4 |
| Fuel system | Injection. DFI® w/43mm Keihin throttle body | Injection. Mikuni® fuel injection, 44mm |
| Engine details | - | Titanium-valves |
| Displacement (cm³) | 449 | 449 |
| Cooling system | Liquid | Liquid |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 96 | 97 |
| Stroke (mm) | 62.1 | 60.9 |
| Gearbox | 5-speed | 5-speed |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) | Double Overhead Cams/Twin Cam (DOHC) |
| Ignition | Digital DC-CDI | TCI: Transistor Controlled Ignition |
| Clutch | Wet multi-disc | Multiplate wet clutch |
| Lubrication system | Forced lubrication, semi and #8209;dry sump | Wet sump |
| Compression | 12.8:1 | 13.0:1 |
| Chassis | ||
| Front suspension | Inverted Showa SFF-Air TAC fork with Triple Air Chamber, DLC coated sliders, 22-position compression and 20-position rebound damping adjustment | KYB Speed-Sensitive System, inverted fork: fully adjustable |
| Rear suspension | Uni-Trak® linkage system and Showa shock, 19-position low-speed and 4-turns high-speed compression damping | KYB® single shock; fully adjustable |
| Front brakes | Single disc. Petal disc with 2-piston caliper | Single disc. Hydraulic. |
| Rear brakes | Single disc. Petal disc with single-piston caliper | Single disc. Hydraulic. |
| Diameter (mm) | 240 | 240 |
| Frame type | Perimeter, aluminium | Bilateral beam frame |
| Front tyre | 80/100-21 | 80/100-21 |
| Rear tyre | 120/80-19 | 120/80-19 |
| Seat | - | Long, two-tone, motocross-style seat |
| Wheels | - | Dunlop® MX33® tyres |
| Front wheel travel (mm) | 305 | 310 |
| Rear wheel travel (mm) | 305 | 318 |
| Trail (mm) | 127 | 119 |
| Rake (fork angle) (degree) | 28.2 | 27.3 |
| Other | ||
| Starter | Kick | Electric |
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 1,495 | 1,486 |
| Kerb weight (kg) | 108.8 | 111.1 |
| Overall height (mm) | 1,280 | 1,275 |
| Overall length (mm) | 2,195 | 2,184 |
| Overall width (mm) | 820 | 826 |
| Seat height (mm) | 950 | 965 |
| Ground clearance (mm) | 335 | 330 |
| Performance | ||
| Fuel capacity (l) | 6.21 | 6.06 |
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