| MODEL | YAMAHA YZ 426 F 2002 |
| Year | 2002 |
| Engine Type | Single cylinder, four-stroke, liquid-cooled, titanium valves |
| Displacement / Capacity | 426 cc |
| Bore X Stroke | 95.0 x 60.1 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid |
| Max Power | 34.3 kW / 47.0 hp @ 9800 rpm |
| Max Torque | 40.0 Nm / 29.5 ft-lbs @ 7800 rpm |
| Ignition | Digital CDI |
| Induction | Keihin carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5-speed |
| Clutch | Wet, multiple-disc, cable operated |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Kayaba upside-down cartridge fork, 300 mm / 11.8 in travel |
| Rear Suspension | Kayaba single shock, 315 mm / 12.4 in travel |
| Front Brakes | Single disc, 250 mm / 9.8 in |
| Rear Brakes | Single disc, 240 mm / 9.4 in |
| DIMENSION SPECS | |
| Overall Length | 2171 mm / 85.5 in |
| Overall Width | 827 mm / 32.6 in |
| Overall Height | 1303 mm / 51.3 in |
| Seat Height | 998 mm / 39.3 in |
| Wheelbase | 1490 mm / 58.7 in |
| Ground Clearance | 375 mm / 14.8 in |
| Dry Weight | 105 kg / 231.5 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 80/100-21 |
| Rear Tyre | 110/90-19 |
| FUEL SYSTEM | |
| Fuel Capacity | 8 Litres / 2.11 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The YZ426F was the 2002 version of Yamaha's pioneering four-stroke motocross bike, a liquid-cooled, five-valve single with titanium valves and a carburettor. It was a large-capacity race machine with long-travel Kayaba suspension and a kick starter, built for the open class.
