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.
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.
Specifications Yamaha YZ250 (2005+):
|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)
|Number of valves per cylinder||petal valve|
|Fuel supply system||Carburetor, 1x Keihin PWK38S|
|Maximum power||53.0 h.p. (38.9 kW) at 8000 rpm|
|Maximum torque||49.0 Nm (5.0 kg-m) at 7500 rpm|
|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||Pendulum with monoshock (fully adjustable), stroke - 315 mm|
|Motorcycle length||2184 mm|
|Motorcycle width||827 mm|
|Motorcycle height||1309 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|
|Fuel tank capacity||8.0 l|
|Motorcycle weight (curb)||103 kg|
Yamaha Off-Road Motorcycles
|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|