The Yamaha YZ250 dates back to 1974 and, unlike the 2-stroke motocross models from other Japanese manufacturers, is still marketed in North America and Europe.
Main competitors:
Considering the Yamaha YZ 250 model, it should be noted that the models are of the greatest interest since 2005 - it was at this time that the motorcycle began to be equipped with an aluminum frame.
The model was based on a single-cylinder 2-stroke liquid-cooled engine with a volume of 249 cm³, producing 53 hp. power and 49 Nm of torque (data refer to 2005 model).
In 2006, the Yamaha YZ250 received a new KYB SSS (Speed-Sensitive System) front fork, in 2008 - petal brake discs.
In 2017, the front brake disc diameter is increased from 250 to 270 mm.
Other features of the model include an aluminum frame, the presence of a YPVS power valve system (optimize engine performance depending on engine speed), a carburetor power system (with a throttle position sensor), fully adjustable sports suspensions, an 8-liter fuel tank, a 5-speed gearbox and 103 kg of curb weight.
In parallel, the Yamaha YZ125 version was also produced, which generally had a lot in common with the YZ250, but was equipped with a smaller engine and a 6-speed gearbox.
The Yamaha YZ 250 has taken part in many international motocross competitions, where it consistently ranked high:
- 5 AMA National Motocross
- 9 AMA National Supercross
- AMA National Supercross (2004)
- 6-time AMA National Offroad Championships
- EMX300 Championship (2014)
Also in the line of Yamaha motocross motorcycles there is a 4-stroke version - Yamaha YZ250F.
Photos
Specifications
Specifications Yamaha YZ250 (2005+):
| Model | Yamaha YZ250 |
|---|---|
| Motorcycle type | cross |
| Release year | 1974+ |
| Frame | Aluminum half duplex |
| Engine type | 1-cylinder, 2-stroke |
| Working volume | 249 cm³ |
| Bore / stroke | 66.4 x 72.0 mm |
| Compression ratio | 8.9 ~ 10.6: 1
9.2 ~ 10.9: 1 - YZ250 (up to 2015, North America) |
| Cooling | liquid |
| Number of valves per cylinder | petal valve |
| Fuel supply system | Carburetor, 1x Keihin PWK38S |
| Ignition type | CDI |
| Maximum power | 53.0 h.p. (38.9 kW) at 8000 rpm |
| Maximum torque | 49.0 Nm (5.0 kg-m) at 7500 rpm |
| Gearbox | 5-speed |
| Drive type | chain |
| Front tire size | 80 / 100-21 51M |
| Rear tire size | 110 / 90-19 62M |
| Front brakes | 1 disc, 250mm, 2-piston caliper - YZ250 (up to 2017)
Single disc, 270 mm, 2-piston caliper - YZ250 (2017+) |
| Rear brakes | 1 disc, 245 mm, 1-piston caliper |
| Front suspension | 48mm inverted fork (fully adjustable), 300mm travel |
| Rear suspension | linkage with monoshock (fully adjustable), stroke - 315 mm |
| Motorcycle length | 2184 mm |
| Motorcycle width | 827 mm |
| Motorcycle height | 1309 mm |
| Wheelbase | 1481 mm
1446 mm - YZ250 (2015+) |
| Saddle height | 997 mm
976 mm - YZ250 (2015+) |
| Minimum ground clearance | 385 mm
367 mm - YZ250 (2015+) |
| Acceleration to 100 km / h | |
| Maximum speed | |
| Fuel tank capacity | 8.0 l |
| Motorcycle weight (curb) | 103 kg |
Yamaha Off-Road Motorcycles
| Yamaha | ||
|---|---|---|
| 85-150 см³ | YZ85 · WR125 · YZ125 | |
| 200-250 см³ | TW200 · TW225 · Serow 225 · Serow 250 · TT-R250 · WR250F · XG250 · YZ250 · YZ250F | |
| 400-500 см³ | WR450F · YZ450F | |
| 600-750 см³ | XT660R | |
Documentation