Yamaha YZ250

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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+):

ModelYamaha YZ250
Motorcycle typecross
Release year1974+
FrameAluminum half duplex
Engine type1-cylinder, 2-stroke
Working volume249 cm³
Bore / stroke66.4 x 72.0 mm
Compression ratio8.9 ~ 10.6: 1

9.2 ~ 10.9: 1 - YZ250 (up to 2015, North America)

Coolingliquid
Number of valves per cylinderpetal valve
Fuel supply systemCarburetor, 1x Keihin PWK38S
Ignition typeCDI
Maximum power53.0 h.p. (38.9 kW) at 8000 rpm
Maximum torque49.0 Nm (5.0 kg-m) at 7500 rpm
Gearbox5-speed
Drive typechain
Front tire size80 / 100-21 51M
Rear tire size110 / 90-19 62M
Front brakes1 disc, 250mm, 2-piston caliper - YZ250 (up to 2017)

Single disc, 270 mm, 2-piston caliper - YZ250 (2017+)

Rear brakes1 disc, 245 mm, 1-piston caliper
Front suspension48mm inverted fork (fully adjustable), 300mm travel
Rear suspensionPendulum with monoshock (fully adjustable), stroke - 315 mm
Motorcycle length2184 mm
Motorcycle width827 mm
Motorcycle height1309 mm
Wheelbase1481 mm

1446 mm - YZ250 (2015+)

Saddle height997 mm

976 mm - YZ250 (2015+)

Minimum ground clearance385 mm

367 mm - YZ250 (2015+)

Acceleration to 100 km / h
Maximum speed
Fuel tank capacity8.0 l
Motorcycle weight (curb)103 kg

Yamaha Off-Road Motorcycles

Yamaha
85-150 см³YZ85 · WR125 · YZ125
200-250 см³TW200 · TW225 · Serow 225 · Serow 250 · TT-R250 · WR250F · XG250 · YZ250 · YZ250F
400-500 см³WR450F · YZ450F
600-750 см³XT660R

Documentation