Yamaha YZ250

From Enduro.team
(Redirected from Yz250)
Jump to: navigation, search


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.



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

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