Comparison of Kawasaki KX450 2021 and Yamaha YZ450F 2020 [S]ave
| Attribute |  Kawasaki KX450 2021 × |  Yamaha YZ450F 2020 × |
|---|---|---|
| General | ||
| Production from (year) | 2021 | 2020 |
| Make | Kawasaki | Yamaha |
| Model | Kawasaki KX450 | Yamaha YZ450F |
| Category | Cross / motocross | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, four-stroke | Single cylinder, four-stroke |
| Valves per cylinder | - | 4 |
| Fuel system | Injection. DFI® with 44mm 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 | 60.9 |
| Gearbox | 5-speed | 5-speed |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) | Double Overhead Cams/Twin Cam (DOHC) |
| Ignition | Digital CDI with 3 Coupler Options | TCI: Transistor Controlled Ignition |
| Clutch | Wet multi-disc, manual | Multiplate wet clutch |
| Lubrication system | - | Wet sump |
| Compression | 12.5:1 | 13.0:1 |
| Chassis | ||
| Front suspension | 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping | KYB Speed-Sensitive System, inverted fork: fully adjustable |
| Rear suspension | Uni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed/19-way low-speed) compression damping | KYB® single shock; fully adjustable |
| Front brakes | Single disc. Semi-floating petal discs | Single disc. Hydraulic. |
| Rear brakes | Single disc. Single-piston caliper. | Single disc. Hydraulic. |
| Diameter (mm) | 250 | 240 |
| Frame type | Aluminum perimeter | 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) | 307 | 318 |
| Trail (mm) | 122 | 119 |
| Rake (fork angle) (degree) | 27.6 | 27.3 |
| Other | ||
| Starter | Electric | Electric |
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 1,485 | 1,486 |
| Kerb weight (kg) | 110 | 111.1 |
| Dry weight (kg) | 105 | - |
| Overall height (mm) | 1,265 | 1,275 |
| Overall length (mm) | 2,185 | 2,184 |
| Overall width (mm) | 820 | 826 |
| Seat height (mm) | 955 | 965 |
| Ground clearance (mm) | 340 | 330 |
| Performance | ||
| Fuel capacity (l) | 6.2 | 6.06 |
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