Key performance

40 ch
Power
🔧
125 cc
Displacement
⚖️
94 kg
Weight
💺
975 mm
Seat height
8.0 L
Fuel capacity
💰
7 499 €
New price
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Technical specifications

Engine

Displacement
125 cc
Power
40.0 ch (29.4 kW)
Engine type
Single cylinder, two-stroke
Cooling
Liquid
Compression ratio
10.7:1
Bore × stroke
54.0 x 54.5 mm (2.1 x 2.1 inches)
Fuel system
Carburettor. Mikuni TMX 38
Lubrication
Premix
Ignition
CDI
Starter
Kick

Chassis

Frame
Semi-double cradle aluminium frame
Gearbox
6-speed
Final drive
Chain   (final drive)
Clutch
Multiplate wet clutch
Front suspension
KYB® Speed-Sensitive System inverted fork; fully adjustable
Rear suspension
KYB® single shock; fully adjustable
Front wheel travel
300 mm (11.8 inches)
Rear wheel travel
315 mm (12.4 inches)

Brakes

Front brakes
Single disc. Hydraulic.
Rear brakes
Single disc. Hydraulic.
Front tyre
80/100-21
Rear tyre
100/90-19

Dimensions

Seat height
975.00 mm
Wheelbase
1443.00 mm
Ground clearance
366.00 mm
Length
2136.00 mm
Width
828.00 mm
Height
1295.00 mm
Fuel capacity
8.00 L
Weight
93.90 kg
New price
7 499 €

Overview

It’s impossible to talk about motocross without the name Yamaha YZ125 echoing in the paddocks. This machine is more than just a two-stroke; it's a rite of passage, a riding school on dirt. For 2020, the Japanese manufacturer is sticking with continuity and a simple aesthetic update, but it doesn’t matter. When you possess such a pedigree, you don't change a winning formula. The heart of the beast remains this 125cc two-stroke liquid-cooled single-cylinder engine, a true mechanical marvel that develops 40 horsepower for just 94 kilograms fully fueled. These figures promise an electric powerband, a sonic aggressiveness that still makes the knees of even the most seasoned riders tremble.

Yamaha YZ125

It must be said that the YZ125 has been shaped by competition. Since its major overhaul in 2015, which gave it this slender and aggressive silhouette, it has constantly been refined. The secret to its effectiveness lies in a surgically precise aluminum chassis, coupled with fully adjustable KYB suspension, inherited directly from the YZ-F four-stroke models. This mechanical base gives it neutrality and track adhesion that make it a formidable weapon. Faced with a KTM 125 SX, often presented as more powerful, the Yamaha opposes reassuring stability and progressivity that appeals to young riders in the making. This is indeed its preferred audience: the teenager aiming for the top of the junior podium, or the amateur rider seeking the most high-performance 125cc motocross bike to perfect their style before moving on to a 250F.

The price of this luxury education? Expect an envelope of around €7499 for the new model. A significant investment, but one in line with a race machine ready to go. For those wondering about homologation, the answer is clear: the YZ125 is a pure competition machine, designed for the track, end of story. Its top speed, although approaching 110 km/h, is just a technical detail; what's important is how it achieves that speed on a circuit. The question "Is the Yamaha YZ125 automatic?" almost elicits a smile, given its demanding handling and short-ratio six-speed gearbox, which require commitment.

Yamaha YZ125

For purists and hardened competitors, Yamaha also offers, through its partner YRRD, an impressive catalog of racing parts, from optimized cylinder heads to titanium exhausts. It is in this spirit of absolute performance that the brand will undoubtedly celebrate the 70th anniversary of the Yamaha YZ125. Because beyond the Speed Block graphics and the giant logo on the tank, the soul of this bike remains intact. It is a direct heir to the glorious machines of the 80s and 90s, the original parts of which, sought after by collectors on sites like CMSNL, testify to a valuable technical heritage. Whether you are looking for the value of a 1993 Yamaha YZ125 or the price of a future Yamaha YZ125 Monster Energy 2025, one constant remains: this model embodies the raw and exciting essence of motocross. A two-stroke that refuses to die, and that, year after year, continues to forge champions.

Indicators & positioning

Weight-to-power ratio
0.42 ch/kg
🔧
Volumetric power
316.0 ch/L
In category Cross / motocross · 63-250cc displacement (378 motorcycles compared)
Power 40 ch Top 31%
9 ch median 27 ch 49 ch
Weight 94 kg Lighter than 58%
69 kg median 102 kg 129 kg
P/W ratio 0.42 ch/kg Top 25%
0.10 median 0.29 0.46 ch/kg

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