| Attribute | Value |
| General |
| Production from | 2018 year |
| Make | Yamaha |
| Model | Yamaha YZ450FX |
| Category | Enduro / offroad |
| Engine and transmission |
| Engine type | Single cylinder, four-stroke |
| Valves per cylinder | 4 |
| Fuel system | Injection. Keihin 44mm |
| Engine details | Titanium valves |
| Displacement | 449.7 cm³ |
| Power | Add |
| Max RPM | Add |
| Fuel consumption | Add |
| Cooling system | Liquid |
| Transmission type,final drive | Chain |
| Torque | Add |
| Bore | 97 mm |
| Stroke | 60.8 mm |
| Gearbox | 5-speed |
| Greenhouse gases | Add |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) |
| Emission details | Add |
| Driveline | O-ring chain |
| Ignition | TCI |
| Clutch | Wet multi-disc |
| Lubrication system | Wet sump |
| Compression | 12.5:1 |
| Exhaust system | Add |
| Chassis |
| Front suspension | KYB® spring-type fork with speed sensitive damping; fully adjustable |
| Rear suspension | KYB® single shock; full adjustable |
| Front brakes | Single disc. Hydraulic |
| Rear brakes | Single disc. Hydraulic |
| Diameter | 245 mm |
| Frame type | Aluminum Bilateral Beam frame |
| Front tyre | 90/90-21 |
| Rear tyre | 120/90-18 |
| Seat | Add |
| Wheels | Dunlop® AT81F tyres |
| Front wheel travel | 310 mm |
| Rear wheel travel | 318 mm |
| Trail | Add |
| Rake (fork angle) | 28 degree |
| Other |
| Battery capacity | Add |
| Starter | Electric |
| Color options | |
| Carrying capacity | Add |
| Light | Add |
| Instruments | Add |
| Electrical Voltage | Add |
| Dimensions |
| Wheelbase | 2,164 mm |
| Kerb weight | 118.8 kg |
| Dry weight | Add |
| Power/weight ratio | Add |
| Overall height | 1,290 mm |
| Overall length | 2,174 mm |
| Overall width | 826 mm |
| Seat height | 965 mm |
| Alternate seat height | Add |
| Ground clearance | 335 mm |
| Front percentage of weight | Add |
| Rear percentage of weight | Add |
| Performance |
| Top speed | Add |
| Acceleration 0-100 km/h | Add |
| Length | Add |
| Reserve fuel capacity | Add |
| Fuel capacity | 7.57 l |
| Oil capacity | Add |
| Width | Add |
| Height | Add |