The Yamaha YZ 426 F motorcycle specifications include a 426 cc (25.99 cu in) engine, a 5-speed gearbox, and a listed weight of 105 kg (231.5 lb).
Key specifications
How the Yamaha YZ 426 F compares
This compares the motorcycle with all Yamaha models in this specifications database. The blue marker is this model and the grey line is the Yamaha database average.
About 23% lower than the Yamaha database average. Around the 49th percentile across Yamaha models.
About 26% taller than the Yamaha database average. Around the 99th percentile across Yamaha models.
About 39% smaller than the Yamaha database average. Around the 27th percentile across Yamaha models.
Yamaha database percentile rankings
Percentiles show where this motorcycle sits across the Yamaha specifications database. They are descriptive database rankings, not performance ratings.
426 cc — larger displacement than about 49% of Yamaha models.
998 mm — taller than about 99% of Yamaha models.
8 L — larger than about 27% of Yamaha fuel tanks in this database.
Dimensions compared with Yamaha average
Each measurement is compared with the average value across Yamaha models where that dimension is available.
2,171
2,082
4% above average.
827
823
Close to average.
1,303
1,172
11% above average.
1,490
1,416
5% above average.
998
793
26% above average.
375
181
107% above average.
Mechanical overview
Additional useful specifications
| Front tire size | 80/100-21 |
|---|---|
| Rear tire size | 110/90-19 |
| Front tire width | 80 mm |
| Front tire aspect ratio | 100% |
| Front rim diameter | 21 in |
| Rear tire width | 110 mm |
| Rear tire aspect ratio | 90% |
| Rear rim diameter | 19 in |
| Front tire pressure | 15 PSI (1 Bar or 100 kPa) |
| Rear tire pressure | 15 PSI (1 Bar or 100 kPa) |
| Engine oil | Yamalube 10W-40 |
| Engine oil capacity | 1.70 L (1.8 US qt) |
| Oil filter | K&N KN-142 |
| Spark plug | NGK CR8E |
| Chain size | 520 |
| Chain links | 114 |
| Sprocket sizes | 14/49 (front/rear) |
| Bore/stroke ratio | 1.58:1 (Oversquare) |
Model information
| Year released | 2002 |
|---|---|
| Category | Cross / motocross |
Engine specifications
| Engine type | Single cylinder, four-stroke |
|---|---|
| Displacement | 426 cc (25.99 cu in) |
| Torque | 40.0 Nm (4.1 kgf-m or 29.5 ft.lbs) @ 7,800 rpm |
| Bore × stroke | 95.0 x 60.1 mm (3.7 x 2.4 inches) |
| Compression ratio | 12.5:1 |
| Valves per cylinder | 5 |
| Cooling system | Liquid |
| Fuel system | Carburettor. Keihin |
| Ignition | digital CDI |
| Starter | Kick |
| Engine oil | Yamalube 10W-40 |
| Oil capacity | 1.70 L (1.8 US qt) |
| Oil filter | K&N KN-142 |
| Spark plugs | NGK CR8E |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
| Clutch | Wet, multiple discs, cable operated |
| Chain size | 520 |
| Chain links | 114 |
| Sprockets | 14/49 (front/rear) |
Chassis and suspension
| Front suspension | Kayaba cartridge upside-down |
|---|---|
| Rear suspension | Kayba single shock |
| Front wheel travel | 300 mm (11.8 inches) |
| Rear wheel travel | 315 mm (12.4 inches) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Single disc |
| Front tire | 80/100-21 |
| Rear tire | 110/90-19 |
| Front tire pressure | 15 PSI (1 Bar or 100 kPa) |
| Rear tire pressure | 15 PSI (1 Bar or 100 kPa) |
Dimensions and weight
| Dry weight | 105 kg (231.5 lb) |
|---|---|
| Seat height | 998 mm (39.3 inches) |
| Overall length | 2,171 mm (85.5 inches) |
| Overall width | 827 mm (32.6 inches) |
| Overall height | 1,303 mm (51.3 inches) |
| Wheelbase | 1,490 mm (58.7 inches) |
| Ground clearance | 375 mm (14.8 inches) |
Fuel and emissions
| Fuel capacity | 8.00 L (2.11 US gal) |
|---|
Performance
| Power/weight ratio | 0.4476 hp/kg |
|---|
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Yamaha models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Yamaha information before relying on them. Visit the official Yamaha website.