Yamaha YZ125: Top Speed, Specs & Review

Yamaha has earned immense respect among motorcycle manufacturers worldwide for their world-class models. There will be a lot of excitement among two-stroke fans that Yamaha is recommitting to their industry. This idea is pursued with Yamaha YZ125. Over the years, it has undergone many changes, but it has remained a race bike that can demonstrate dirt bike techniques as well as be used for many other things.

If you want to know more about Yamaha YZ 125 top speed, specs, and price, read the full article for a better understanding.

Top Speed of Yamaha YZ125

Increasse speed

Yamaha YZ 125 has a top speed of 65 – 70 mph, along with a maximum power of 35 HP (26 kW) and maximum torque of 16.29 pound-feet at 11,000 rpm. Despite its low engine displacement, its top speed is quite impressive. However, the speed varies from model to model. 

Over the years, this model’s weight has increased or decreased several times. The weight fluctuation drastically affected the YZ125’s top speed either negatively or positively. This is due to the reed valve induction system that will allow you to dominate your competition.

Are you interested in increasing YZ125’s speed?

There is no doubt that the Yamaha YZ125 is an impressive piece of technology. Taking this bad boy for a ride is thrilling and fun. If you are not satisfied with its top speed, then it is possible to further increase the speed of this bike with a variety of different mods available on the market. 

 Do the following:

  • Use a 144cc engine kit
  • Upgrade gear to 13/49
  • Use an upgraded valve system




Here are the specifications of this beast given below.


Engine type125cc liquid-cooled 2-stroke; reel-valve inducted
Fuel deliveryMikuni TMX 38
Compression ratio8.6~10.7:1
Bore and Stroke54mm * 54.5 mm
Final driveChain
TransmissionConstant-mesh 6-Speed; multiple wet clutches


Seat height38.6 in
L * W * H84.1 *32.6 * 51.0 inches
Wet weight207 Ib
Fuel capacity2.1 gal
Ground clearance14.4 in
Wheelbase56.8 in
Trail4.3 in


Suspension/frontKYB speed-sensitive system inverted fork; fully adjustable, 11.8-in travel
Suspension/rearKYB single shock; fully adjustable, 12.4-in travel
Tires/front80/100-21 Dunlop MX52
Tires/rear100/90-19 Dunlop MX52
Brakes/frontHydraulic disc 270mm
Brakes/rearHydraulic disc 245mm


Yamaha YZ 125 has a 125 cc reed-valve inducted two-stroke engine. It has a 10.1:1 compression ratio and 54.0 mm x 54.5 mm Bore x Stroke. Its engine also has a liquid cooling system that prevents it from overheating. 

Furthermore, it has a Hitachi Astemo® Keihin PWK38S carburetor fuel delivery system that provides an air and fuel mixture to the engine and CDI ignition that provides a spark to start the engine operation. Lastly, it also has Constant-mesh 6-speed transmission along with the multi-plate wet clutch.  

Tires & Brakes

It is equipped with a 270 mm hydraulic disc brake for the front tire and a 240 mm hydraulic disc brake for the rear tire. Both of the brakes are excellent at their work and provide complete safety to their rider. Even at any speed, you can easily stop the bike with these responsive brakes.

Furthermore, reducing unsprung weight on the light wheel helps these brakes to function effectively. 


It has a KYB® Speed-Sensitive System inverted front fork along with 11.8 inches of wheel travel, and for the rear side, it has KYB® single shock along with 12.4 inches of wheel travel. Both front and rear suspension are fully adjustable, so riders can easily adjust them according to the weight and road condition. 

Besides providing outstanding performance, these suspensions are highly comfortable as well. So you can easily handle your bike even when cornering.

Lighter Frame

Plastic is no longer used for the frame of this model; instead, aluminum alloy is used that provides the required amount of integrity. Besides being lightweight, aluminum also offers solidity, which is why this semi-double cradle frame is not only flexible but also solid.

Further, considering trail riding is usually quite rough, this frame is an excellent fit for your adventure and will not disappoint you.

Price of Yamaha YZ 125

Yamaha is still manufacturing the YZ 125 in 2023 with a price range of $6,899 – $7,199. For some reason, if you are not able to purchase this beast in brand-new condition, there are many pre-loved models of this dirt bike available in the market. You can buy one from them and enjoy this robust machine ride. 

Final Thoughts

The Yamaha YZ 125 is equipped with a powerful engine that produces enormous power. It has a strong aluminum frame can hold all the jumps during off-road and trail rides. Its suspensions are also excellent and absorb all the bumps and jolts, resulting in smooth and comfy rides. 

Furthermore, due to its vast power, its needs quality brakes which are also fully filled by its dual front and back hydraulic brakes. Notably, it has a low displacement engine, but its power is not suitable for beginners, so it is not suggested to them. Lastly, when it comes to dirt bikes, its price is moderate, so you can consider them and enjoy their rides.


Here are the frequently asked questions, and their answers given below.

What is the YZ125 Seat height?

Yamaha YZ125 has 38.6 inches seat height making it 0.6 inches taller than Yamaha YZ 450F. Its height is attributed to its long-travel suspension, which makes it more performance-oriented and provides it with the height of a premier-size motocross bike. Lastly, you can adjust your ride height by adjusting the shock sag as needed.

Is the Yamaha YZ 125 suitable for beginners?

No, Yamaha YZ125 is not suitable for beginners. Although it has a 125cc engine but due to its power, it is prohibited. You can go with the other dirt bikes like Yamaha TTR 230.

Is YZ 125 have automatic transmission?

No, Yamaha YZ 125 does not have automatic transmission; instead, it has a sequential manual gearbox with five or six speeds depending on the model.

What is the rev limit of a YZ125?

YZ 125’s latest model has a power curve that stays at 11,300 rpm.

In short, the Yamaha YZ125 is a powerful machine with robust features and specs. Its engine’s comfort level and robust power are difficult to meet. This lets you enjoy a comfortable and exciting ride. However, this bike is unsuitable for beginners.

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