How Fast is 125cc: Average Max Speed of 125cc Dirt Bike (With Examples)

How fast is 125cc? That’s one of the most common questions new riders ask when considering their first dirt bike. Riding a dirt bike is always a mix of fun and comfort, even though they aren’t primarily designed for extreme racing speeds. When you have a 125cc dirt bike in your hands, for instance, you can expect a certain maximum speed depending on its engine type, engine performance, and other factors like rider weight and road conditions. In ideal conditions, such as hard-packed trails or paved roads, 125cc dirt bikes typically reach top speeds of approximately 60 mph.

The average speed of a 125cc dirt bike is around 45 MPH, though this can vary depending on the model, engine size, and whether it’s a two stroke or a 125 4 stroke. Generally, two stroke bikes deliver more horsepower and higher RPMs, while four stroke engines are more fuel efficient and easier for new riders to manage. A two-stroke engine is known for its high power-to-weight ratio, delivering more power with less weight.

If you’re curious about the speed capabilities of popular bikes—including how to increase the speed of a Harley Davidson motorcycle—this article provides detailed examples so you can make an informed decision before buying. From Yamaha to Honda, Suzuki, Husqvarna TC125, KTM, and Apollo, we’ll break down their top speed, power output, and overall performance. A 125cc dirt bike typically reaches a top speed of around 60 miles per hour on a hardpack straightaway.

1. KTM 125 – 73 MPH

The KTM 125 SX is a well-known racing bike that delivers impressive engine performance. Powered by a two stroke 125cc engine, its peak power allows it to hit a max speed of about 73 MPH. High-performance 125cc two-stroke dirt bikes can often reach speeds closer to 65 to 70 mph.

Compared to the Yamaha YZ 125 or Honda CR 125, this KTM provides more power and better acceleration, though it also requires frequent maintenance due to its racing nature. Many lightweight adults and young riders who want enough power for both trail riding and competitive tracks choose this bike despite its higher seat and reliance on stock parts or aftermarket modifications for tuning. Upgrading the exhaust system can improve power output on a 125cc dirt bike.

2. Suzuki 125 – 50 MPH

The Suzuki DRZ 125 represents a reliable 125cc 4 stroke option. It runs on a four stroke engine that emphasizes fuel efficiency and smooth handling rather than sheer speed.

Its top speed is around 50 MPH, which is the same top speed you’ll find on Yamaha’s TTR 125. While not built for high speeds, it provides manageable size, a lower seat, and better control for new riders or short trips on paved roads and rough terrain. Heavier riders may experience slightly lower speeds due to increased resistance.

3. Yamaha 125

Yamaha is a leader in producing versatile 125cc dirt bikes, with two standout models.

Yamaha TTR 125cc Max Speed

Let’s look at the TTR 125: The TTR 125 features a four stroke engine with a maximum speed of around 50 MPH. This is nearly the same top speed as the Suzuki DRZ 125, but Yamaha’s engine performance often gives it slightly more power to weight ratio and smoother ride. It’s a great choice for new riders and young riders who need a bike that’s fuel efficient and suitable for trail riding or short trips.

Yamaha YZ 125cc Max Speed

What about the YZ 125? The YZ 125, on the other hand, is a two stroke powerhouse, capable of reaching high speeds up to 70 MPH. With more horsepower and a lightweight build, this bike’s speed capabilities make it perfect for racing and riders with more riding experience. However, it requires regular maintenance and sometimes carburetor tuning or sprocket gearing adjustments to maximize its performance.

4. TM MX125 – 62 MPH

The TM Racing MX125 delivers around 62 MPH at maximum speed, thanks to its two stroke engine with excellent power output. Known for strong acceleration and higher RPMs, this bike is popular among riders who want more power for rough terrain and track riding.

Its engine’s cylinders and advanced design make it one of the strongest in its class. However, it requires frequent maintenance to keep its performance at peak levels.

5. Apollo 125 Dirt Bike – 55 MPH

The Apollo DB-007 is a 125cc 4 stroke dirt bike that reaches 55 MPH at max speed. With a four stroke engine, it prioritizes fuel efficiency while still offering enough power for lightweight adults or new riders.

Its engine capacity and manageable size make it a practical bike for trail riding, short trips, and paved roads, though it’s not built for racing or high speeds.

6. Honda 125 – 55 MPH

The Honda CRF 125 is another reliable 125cc 4 stroke option. With a maximum speed of 55 MPH, it delivers steady power output and good torque for trail riding. A 125cc dirt bike is ideal for beginners due to its manageable power and size.

It’s a favorite among many riders because of its fuel efficient design, lower seat height, and overall control. While not as fast as KTM or YZ models, it offers enough power for young riders and new riders to safely build their riding experience.

7. Coolster 125X Dirt Bike – 42 MPH

The Coolster 125X produces a top speed of 42 MPH, making it one of the slowest on this list. Powered by a four stroke engine, it sacrifices speed capabilities for fuel efficiency and a manageable size. A 125cc dirt bike is suitable for tall kids and smaller lightweight adults for a comfortable and enjoyable riding experience.

It’s an ideal bike for young riders, lightweight adults, or those focusing on control and safety rather than high speeds.

8. X-PRO 125 Dirt Bike – 60 MPH

If you’re looking for a 125cc dirt bike that delivers some relatively high top speed, then the X-PRO is the perfect candidate.

Powered by a 4-stroke semi-automatic transmission 125cc engine, the X-Pro delivers 60 miles per hour of maximum speed if you compare this to many of what we have here, you can say that X-PRO is no pushover when it comes to speed. Weight reduction through aftermarket parts can improve handling and speed.

9. Husqvarna TC 125 – 70 MPH

The Husqvarna TC125 is a two stroke racing bike with one of the highest speed capabilities in its class. With a maximum speed of about 70 MPH, it delivers excellent power to weight ratio, horsepower, and torque.

It’s not suited for young riders or new riders because of its aggressive engine performance and demand for strong physical fitness. Still, many riders praise its bike’s power and ability to handle rough terrain while maintaining high speeds.

Frequently Asked Questions

Q: How long does it take to reach top speed on a 125cc dirt bike?

This can vary based on the engine type (two stroke vs. four stroke engines) and the bike’s power. A two stroke 125cc can reach speeds and peak power faster due to its higher RPMs and power output, while a 125 4 stroke top speed takes longer but provides smoother acceleration and better fuel efficiency. Rider weight, road conditions, and even stock parts vs. modifications like sprocket gearing affect how fast a bike can achieve its max speed. Smooth, hard-packed tracks enable higher speeds than rougher terrains.

Q: How dangerous are dirt bikes at top speed?

Generally, whether you’re on a maximum speed or not, riding a motorcycle is always a dangerous activity. There’s also the safety part of the dirt bike. Interestingly, fun or riding is reaching the top speed.

There are precautions to avoid or at least lessen the effect of a dirt bike crash. Experience is crucial; beginner riders have got to be more careful. Especially if you’re riding a 125cc dirt bike, you’ve got to be in your teenage years. They’re designed for older kids.

Q: Are 125cc dirt bikes good for beginners?

Yes. The 125cc 4 stroke is often considered the best for new riders because it offers a balance of fuel efficiency, manageable size, and speed capabilities without overwhelming power. It’s easier to handle on paved roads, rough terrain, and during short trips, while still delivering the speed of a 125cc that makes off-road riding fun.

Conclusion

125cc dirt bikes provide a great way for beginners to get into off-road riding and experience the thrills of the sport. With a maximum speed ranging from 70 – 73 mph, these bikes are powerful yet still agile enough to be controlled easily. All riders should take safety seriously and wear the correct protective gear before hitting the trails. With the right 125cc dirt bike, you can enjoy an exciting new adventure while being safe and in control.

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