Yamaha YZ125

The Yamaha YZ125 begins its history in 1974 - then it was an archaic (by modern standards) motorcycle with an air-cooled engine and double shock absorbers at the rear, which did not resemble a cross model in the modern sense. Only by the end of the 80s of the last century, the Yamaha YZ 125 acquires modern features, and by 1989 - an inverted fork. In our review, we will be looking at models starting in 2005, when the motorcycle received a modern aluminum frame.

Since 2006 the motorcycle has been equipped with the new KYB SSS (Speed-Sensitive System) front fork.

In 2007, the Yamaha YZ125 undergoes minor changes, the main of which are new petal brake discs, and in 2017 - an increased diameter of the front disc (from 250 to 270 mm).

The Yamaha YZ125 features a 2-stroke liquid-cooled engine with a power valve system (YPVS), an aluminum frame (since 2005), sports adjustable suspensions, an 8-liter fuel tank, a carburetor power system and 94 kg of curb weight.

In 2001, Yamaha introduced a 4-stroke version Yamaha YZ250F, which was intended to replace similar 2-stroke models, but the YZ125 is still sold in parallel and may be in the same racing class.

The main competitors of the Yamaha YZ 125 in the class:

• Honda CR125R
• Kawasaki KX125
• Suzuki RM125

Photos

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Specifications

Specifications Yamaha YZ125 (2005+):

Model	Yamaha YZ125
Motorcycle type	cross
Release year	1974+
Frame	Aluminum half duplex
Engine type	1-cylinder, 2-stroke
Working volume	124 cm³
Bore / stroke	54.0 x 54.5 mm
Compression ratio	8.6 ~ 10.7: 1
Cooling	liquid
Number of valves per cylinder	petal valve
Fuel supply system	Carburetor, 1x Mikuni TMX38
Ignition type	CDI
Maximum power	39.0 h.p. (28.7 kW) at 11,500 rpm
Maximum torque	25.5 Nm (2.6 kg-m) at 10,000 rpm
Gearbox	6-speed
Drive type	chain
Front tire size	80 / 100-21 51M
Rear tire size	100 / 90-19 57M
Front brakes	1 disc, 250mm, 2-piston caliper - YZ125 (up to 2017) Single disc, 270 mm, 2-piston caliper - YZ125 (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	2135 mm
Motorcycle width	827 mm
Motorcycle height	1315 mm
Wheelbase	1443 mm
Saddle height	997 mm 975 mm - YZ125 (2015+)
Minimum ground clearance	386 mm 365 mm - YZ125 (2015+)
Acceleration to 100 km / h
Maximum speed
Fuel tank capacity	8.0 l
Motorcycle weight (curb)	94 kg

Documentation

• Yamaha YZ125