How Fast Does a 125cc Dirt Bike Go? (Includes Examples)

Are you wondering how fast 125cc dirt bike go?

Speeds vary depending on the brand and the engine, whether 2-stroke or 4-stroke.

Well, do you think of the safe speeds for your KTM 125-SX, Yamaha YZ125, Husqvarna TC125, Beta 125 RR or any other 125cc dirt bike? In this post, I’ll explain how fast a 125cc 2-stroke or 4-stroke dirt bike goes.

How Fast Does a 125cc Dirt Bike Go?Pin

So, how fast does a 125cc dirt bike go? The average max speed of a 125cc dirt bike is 45 mph. For the top speed, the 125cc category sees dirt bikes clock in at almost over 100mph. But, contrary to most opinion, not all 125cc dirt bikes feature these types of speeds. You already know that the mention of dirt bikes only conjures up off-road capabilities and less of blistering high speeds.

Luckily, not all dirt bike suppliers have shown 125cc models the front door in regards to speed. As I found out, there are a few brands that still have not forgotten about the need for speed in 125cc dirt bikes. These are 125cc dirt bikes that speed diehards can get a thrill of and enjoy depending on the type of engine in place.


How Fast Does a 125cc 2-Stroke Dirt Bike Go?

KTM 125 SX

KTM 125 SX top speed is 75mph

The KTM 125 SX comes across as one of the fastest 2-stroke conventional dirt bikes for the 125cc rank.

For whats it’s worth, it packs a powerful competition-specific engine capable of high speeds.

In the specs sheet, the brand dirt bike can achieve a top speed of 75 mph from its two-stroke engine capacity.

That is along with the 16.41 foot-pounds of torque that result in a high-end power output of 11,000 rpm.

I did find out that the rpm is less than the 150 SX but still ranks highly among the 125cc engine class.

Also, the engine type for the KTM 125 SX sits above the rest. It has a liquid-cooling system for the single-cylinder engine capacity.

That makes it a great point to find out the best two-stroke engine ride that will answer your question on, ” how fast does a 125cc dirt bike go?”.

The Husqvarna TC125

The Husqvarna TC125 average max speed is 70 mph.

Husqvarna has a reputation for building admirable dirt bikes with excellent handling and performance.

That is the trend I came across when reviewing the Husqvarna TC125 as a potential suitor to answering me on how fast does a 125cc dirt bike go.

As one of the most advanced 125cc models, it reads an ultra-modern look with supremely high quality.

For beginners, the brand fits a six=speed transmission engine to give its the 124.8cc displacement capability.

The talk on the engine also goes further to include considering having a liquid-coolant due to the compatible design available with the Husqvarna’s engine.

Like most two-stroke dirt bikes, Husqvarna also makes this dirt model with a sophisticated power valve with reed intakes. These reed-type valves give the Husqvarna TC125 an extra kick in terms of high-speed performance. The resulting process is the dirt bike being able to achieve high speeds of up to 70 mph as per the estimates.

Beta 125 RR

The top speed for Beta 125 RR is 70 mph.

To put it, the Beta 125 RR is among the fastest. To give a glimpse of this, we would have to look at the power base motor.

It still is not much, but at 125cc, this dirt bike can even afford to achieve 70 mph as its top speed.

While this is by no chance the highest in the list, it remains decent enough considering other factors.

One of these factors lies within the engine. The Beta manufacturer makes this 125cc dirt bike with a single-cylinder engine that runs on a six-speed transmission. For more or less, this allows the rider to shift while speeding.

Further increasing the speed monster factor is the ability of the dirt bike to hold more fuel. I consider the 1.6-gallon gas tank as an adequate source of enough horsepower and torque in different riding conditions.

And talking of horsepower, you can consider the 125 RR to a suitable candidate at riding aggressively in various terrains.

The hard-core tires plus the incredible engine pull would have you are pulling away in trail riding with almost 37 hp in sheer capability. For the engine power diehard, this makes the Beta 125 RR an option to consider for getting your ride speed up.

Yamaha YZ125

The average max speed for Yamaha YZ125 is 70 mph.

You will not miss a Yamaha model in any list involving dirt bikes. My consideration for the Yamaha YZ125 lies in the fact that it takes pride in being an adventure.

But despite this, I still consider it practically when you need to hit the throttle hard and maneuver quickly.

To start with, the heart of this dirt bike runs on a liquid-cooled 2-stroke dirt bike engine.

Additionally, there is a six=speed transmission system that couples with a multi-plate wet clutch to provide ride control.

I would count on you to notice a massive difference in this while on the track.

Lastly, the Yamaha is also impressive in getting its horsepower to the peak. At 11,600 rpm, it remains a decent option for the high-end of the horsepower class.

You can also check this post that I wrote: How Fast Does a 450cc Dirt Bike Go?

Yamaha also identifies that this sees the engine have a high output of almost 35.36 horsepower.

Kawasaki KX125

The maximum speed for Kawasaki KX125 is 70 mph.

The Kawasaki KX125 is also our focus when it comes to getting to know how fast is a 12cc dirt bike.

Already, there is a pretty good chance that you have come across it with a herd of young racers rushing out the starting line.

And there are good reasons on why you keep seeing the Kawasaki model around.

I would jump on this bandwagon by saying the Kawasaki 125cc model has all to the desire for a quick 2-stroke dirt bike.

Its a single-cylinder engine with a Kickstarter to boot the 2-stroke engine to life.

Likewise, you will also find that the transmission runs on a six-speed transmission system.

To run this, Kawasaki has put a 2.2-gallon tank to keep the engine running for enough time.

If you into aggressive riding, the Kawasaki KX125 might come off as an option to consider.

For its worth, the engine can clock 75mph on a straight level road. But, for the average speed rating, the Kawasaki XK 125 drops south to have its top speed at 70 mph.

And to make up for it, the engine still produces a maximum power output of 40 HP from its chain final drive.

That is alongside the already impressive maximum torque of 2700 RPM from the single-cylinder engine.

In most circumstances, this makes it one of the leading speedsters in the dirt bike world.

How Fast Does a 125cc 4-Stroke Dirt Bike Go

Honda CRF125F

The top speed for Honda CRF125F is 50 mph.

From the specs sheet, you can expect the CRF125F to offer a modern off-road experience while allowing you to maximum speed.

You will find this possible due to the 124.9cc engine having a strong bottom-end torque to boost.

For the record, Honda lists the peak torque at 7.52 lb/ft @ 4,500 rpm.

Also, as a result, the engine speed builds linearly to reach highs of almost 73 mph.

If it’s a smooth terrain such as desert riding, the Honda model can hit the 80 mph with the right carb.

Besides, the transmission also plays a role in the speedy end-result. For instance, the four-speed gearbox helps generate a peak horsepower rate of 8.9 HP, which you can achieve at 7,000 rpm.

That makes the Honda ride manage the high-speed performance while also having confident handling and braking.

Yamaha TT-R125LE

The top speed for Yamaha TT-R125LE is 55 mph.

The Yamaha TT-RI125LE is another little thumper you can rely on for speedster enthusiasts on dirt bikes.

It is also reliable due to a multitude of features that enhance its handling and riding abilities.

To power this Yamaha, the brand sought to have a 124cc single stroke engine to run the dirt bike.

That is plus the constant-mesh five-speed transmission that works with a multi-plate wet clutch to achieve optimal riding.

If speed remains your concern, know the Yamaha TT-R125LE can reach 55 mph at its best.

However, it will depend on the level of skill of the rider on board since they are in charge.

While the speed seems mellow, I also consider the torque power to deliver plenty of confidence.

Yamaha has the engine running on a single-cylinder system to help it round off the max torque.

Not forgetting, the maximum torque possible with this Yamaha stands at a rate of 6.64 ft/lbs (9.0 Nm) @ 6500 RPM.

For more about how much horsepower a dirt bike has, check out this article I wrote: How Much Horsepower Does a Dirt Bike Have?

Apollo 125cc DB X18

The average max speed for Apollo 125cc DB X18 is 55 mph.

The Apollo dirt bike also cuts out the competition when it comes to differentiating how fast does a 125cc dirt bike go.

In my review of the model, I came across the 4-stroke single-cylinder engine as a potential source of efficient riding power. By this, I mean the 125cc packs enough torque and horsepower than most existing models.

On the matter of the torque, the maximum for this Apollo dirt bike stands at 9.0ft.lbs at 5500 rpm.

The flip side also indicates the maximum horsepower stands at 8.2 HP, which is authoritative for a fantastic riding experience.

That is also part of the engine and its 4-speed manual clutch transmission.

Now, considering such impressive torque and horsepower means also a better speed. You will get the thrill of knowing that the Apollo dirt bike top speed at 55 mph as the maximum achievable speed.

In comparison, this is commendable for the four-stroke category of dirt bike since it ranks as among the highest.


Its top speed is 55 mph

The COOLSTER dirt bike has a 125cc engine displacement with a maximum power output of 4.72 HP.

For reliable options, this remains on the low end when we compare with the 2-stroke designs. However, for 4-strokes, this is plenty of stable power.

Part of the engine’s design further provides exceptional performance in terms of revving power.

You will find the air-cooled engine runs a maximum torque amount of 8.0N.m/5500r/min.

This is plus the maximum rate of the power output that stands at 5.7KW/7500r/min for maximum horsepower.

You can get this dirt bike on Amazon by clicking here.


If dirt bikes meant for off-road capabilities are achieving high blistering speeds, then its pure bliss.

However, the standard argument is that you won’t find a 125cc engine dirt bike with such characteristics.

As you can see, there are different models in the category to sure answer you entirely on, “How fast does a 125cc dirt bike go?”. So decide on which 125cc dirt bike meets your speed expectations.

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