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How Fast Does a 125cc Dirt Bike Go? 4 Ways to Make it Faster

How fast does a 125cc dirt bike go

Dirt bikes are an exhilarating, fun outdoor activity for kids and adults alike. Making it ideal for beginners, 125cc dirt bikes are small and lightweight. Before investing in a dirt bike, you must know if it’s the right one. How fast does a 125cc dirt bike go? Can I make my dirt bike more efficient? Are dirt bikes safe for kids? You must know the terrain you will ride in and get a bike that meets those needs. You have to be comfortable riding the dirt bike. 

How Fast Does a 125cc Dirt Bike Go?

A 125cc dirt bike has a top speed of 50-60 miles per hour. Dirt bikes are all about speed and power, which is why it is such an exciting experience. The speed range also depends on the make, brand, and model of the dirt bike—how it is being kept and how you are riding it. Different factors, such as weight, framework, engine type, and more, affect the speed and Performance of a 125cc dirt bike.

2 Stroke V. 4 Stroke 125cc Dirt Bike

A 2-stroke 125cc dirt bike has a top speed of 50 miles per hour. On the other hand, a 4-stoke 125cc dirt bike has a maximum speed of 70 miles per hour. 

Both engine types require different maintenance and offer contrasting benefits. 

A 2-stroke 125cc dirt bike is faster, simpler, and more powerful. But this makes it harder for the rider to control and maneuver on rough paths. 

A 4-stoke 125cc dirt bike gives you a smoother riding experience and is much easier to handle, especially for people just starting. 

4 Ways to Make a 125cc Dirt Bike Go Faster

1: Increase the Airflow for Proper Functioning

Airflow is essential for a machine to work properly. Cheap filters will not work effectively to keep out the debris and other particles that fly into the dirt bike, and it can cause a build-up of dirt that can block the airflow. Using a premium filter will solve this issue. 

Installing a dual filter will enable the first filter to stop bigger particles, and the second layer will filter out the smaller dirt particles. It will ensure that clean air gets into your engine.

High-quality filters are also reusable. You can wash it and use it a few times, and thus you will save money too.

2: Change the Clutch to Enhance the Performance

Most dirt bikes come with a clutch in good condition and for general use. But changing your clutch to one more suited for racing will increase the Performance of your dirt bike, and you will have more ground power, which means a better pick-up and acceleration rate. 

3: Upgrade Your Exhaust to Benefit the Engine

The exhaust is much more than just the sound, it takes care of letting out all of the harmful gasoline fumes produced by the dirt bike. Upgrading your exhaust muffler will let your dirt bike’s engine breathe better and increase your bike’s speed. 

4: Regular Maintenence Keeps Your Bike Up-To-Date

Cleaning your bike and keeping it in good working condition is a must. You have to change the oil and lubricate the various parts of the dirt bike to keep it running smoothly and without hassle. If you are not using your dirt bike or not cleaning it properly, it can start to rust and damage the inside parts of your dirt bike, which can cost you a lot to repair or replace. 

Is a 125cc Dirt Bike Good for Off-Roading?

Yes, 125cc dirt bikes are suitable for off-roading. They are one of the best beginner dirt bikes for people to ride and enjoy. This dirt bike is well suited for a wide range of terrain and perfect for racing off-road.

Is a 125cc Dirt Bike Good for Kids?

15 years and above can ride a 125cc dirt bike. If you are younger than 15, riding a 125cc dirt bike is not advised. A 125cc dirt bike is for teenagers, and small adults as these are powerful and might be too much for small kids to handle. Kids between 5-7 years of age should ride 50cc dirt bikes, which are easier to manage and operate.

List of 3 Fastest 125cc Dirt Bikes

1: KTM 125 SX

The KTM 125 SX is a 125cc dirt bike that packs a punch! It can reach speeds up to 100 miles per hour and has all the specs you would expect from a monster racing bike. It has a high-quality yet lightweight body and an impressive 1-cylinder 2-stroke engine. 

2: Yamaha YZ 125

The Yamaha YZ has been around since the 1970s as part of Yamaha’s dirt bike lineup. This dirt bike has a max speed of 70 miles per hour. The engine type is a liquid-cooled 2-stroke reed valve single cylinder which provides thrilling acceleration. 

3: Husqvarna TC-125

The Husqvarna TC-125 is one of the best 125cc dirt bikes out there. It has a speed of up to 70 miles per hour. KTM also owns this brand. The lightweight engine provides more torque. The ergonomics and design of this dirt bike are inspired by Sweden. It allows the rider, beginner, or pro to perform in comfort.  

List of 6 Brands Making 125cc Dirt Bikes

  • Honda
  • Kawasaki
  • Suzuki
  • Yamaha
  • KTM
  • Husqvarna


To summarize, how fast does a 125cc dirt bike go, the answer is 50-60 miles per hour. A 125cc dirt bike is excellent for teenagers over 15 years old and a good option for new adult riders. 125cc is a powerful bike for racing, and the best in the category is the KTM 125 SX. 

Keeping your bike in good condition and tending to it regularly is a great way to keep it in working order. You can also make a few modifications and tweaks to the bike parts, like changing the air filters or upgrading some features to give your bike a higher-quality performance.


What is the top speed of a 125cc 4-stroke dirt bike?

The top speed of a 125cc 4-stroke dirt bike is 70 miles per hour.

What is the top speed of a 125cc 2-stroke dirt bike?

The top speed of a 125cc 2-stroke dirt bike is 50 miles per hour.

Is a 125cc dirt bike ideal for adults?

Yes, a 125cc dirt bike is suitable for adults, and teenagers above 15 can also ride this dirt bike.

How tall is a 125cc dirt bike?

An average 125cc dirt bike seat height is 31 to 36 inches.

Which is the Fastest 125cc Trail Dirt Bike?

The fastest 125cc trail dirt bike is the KTM 125 SX, which can reach 100 miles per hour.