You must have been looking for the answer to how fast a 50cc dirt bike can go. Speed, control, and safety would probably become paramount concerns, not just numbers on a speedometer. This guide takes you through average speeds, types of engines that might be found on dirt bikes, performance, tuning possibilities, and, most certainly, how to ride them while having fun in a safe manner.

What Is a 50cc Dirt Bike & Who Is It For?

Before we start getting all speed-crazy, let’s just clear up 50cc dirt bikes and who the heck they’re made for.

50cc Engine Overview

A 50cc (50 cubic centimetres of engine space displacement) is the smallest class of dirt bikes under gas. However, that does not mean they’re toys. They have real rides and real capability. Most 50cc dirt bikes for adults and kids have two kinds of engines: 2-stroke and 4-stroke.

If you were getting it for a younger rider or someone just starting out with motorcycles, a 4-stroke would probably be a more sensible and safer choice. But, for pure grunt and snappier throttle response, the best bets are the 50cc 2-stroke bikes.

Common Riders & Uses

So, what are the 50cc dirt bike riders? Certainly, child’s dirt bike 50cc are for kids aged between 5 and 10 years. These are excellent vehicles for entry-level practice to gain balance and control and understand how the bike works.

Some 50ccs are purely recreational, while others are made with a beginner motocross racing audience in mind. Few models made for the racetrack that go fast and have more advanced suspension and better brakes, considering how young riding enthusiasts develop real competitive skill.

How Fast Does a 50cc Dirt Bike Go?

Most probably, you are here for this answer: how fast will a 50cc dirt bike go?

Average Top Speed Range

In general, the average top speed of a 50cc dirt bike is around 25 to 40 miles per hour (40 to 65 km/h). But this is just an average because it is significantly affected by engine type, model, terrain, rider weight, and whether this bike has been modified or not.

Speed Compared With Other Engine Sizes

A 70cc dirt bike can move at a speed of 45-50 mph. At 110cc, consider about 50-60 mph. Climbing up the ladder to a 125cc dirt bike, you can go up to and over 70 mph.

Some of those speed reductions can be overwhelming to younger riders; that’s why the 50cc class is often termed the starter class. Just fast enough to be fun but not so fast that it causes danger by increasing while learning clutch control, braking, and cornering.

Factors Affecting Speed

Even if you’re riding the exact same model as someone else, your speed can vary. Here’s why.

Rider Weight and Terrain

Typically, even with the same model of bike, the speed will differ for each rider. Rider weight makes a lot of difference. For a child weighing around 60 pounds, the speed from a 50cc engine would be far more than what would be given to an adult weighing 150 pounds. Acceleration goes faster for a lighter rider with a greater achievable maximum speed. And then, of course, comes the terrain. The smooth, flat ground surface has the very least resistance. Add a few inches of incline or put some gravel or mud in the way, and many miles per hour are just lost.

Two-Stroke vs Four-Stroke

Engine type makes a massive difference in speed. Most of the two-stroke 50cc motorcycle dirt bikes tend to be speed and aggression-oriented. They have a very quick throttle response and make them look like miniature rockets when they jet off.

A 4-stroke, on the other hand, spreads its power more evenly. It’s easier to manage for young riders and delivers better traction at lower speeds. But you’ll usually sacrifice a few mph at the top end.

Manufacturer & Model Variations

Speed also depends on the brand and build philosophy. Here are some real-world examples:

• KTM 50 SX: Race-ready, 2-stroke, top-grade components: Max speed 45 mph.
• Yamaha PW50: Old school 2-stroke speed governor, made safe for learning.
• Honda CRF50F: 4-stroke, forgiving, and clocks around 30 mph.

Some manufacturers purposely limit speed for safety, while some put more race-oriented builds for a little freedom in tuning. Always read through back-end specs; not all 50cc motors are regulated evenly.

Will You Be Able to Make Your 50cc Dirt Bike Motor Go Faster?

It’s tempting, right? You’ve got a 50cc bike and you’re thinking: what if I added just a little more speed?

Performance Modifications

No doubt, these aftermarket upgrades can add to the peak speed. Generally, these are common methods of modification:

• Change the OEM exhaust system to a freer-flowing aftermarket one.
• Alter the front or rear sprocket size to change the gear ratio.
• Advanced riders can even experiment with carburetor tuning, add a different air filter, or remove factory-installed speed limiters.

When all these changes are put in place, about 5 to 10 miles per hour could be gained at the top end. That doesn’t sound huge, but it can feel like a major leap when you’re dealing with a lightweight bike and tight riding spaces.

Risks of Modifying a 50cc Dirt Bike

See, the more speed, the more wear generally. Modification pushes a stronger engine to wear out more quickly without proper upkeep.

Mostly, you would be taking a beginner-friendly bike and turning it into something much more unpredictable and therefore unsafe, especially with kids involved.

Safety Considerations While Riding at Max Speed

Even on a small bike, riding at 40 mph without proper protection can end badly. Here’s how to stay safe.

Right Equipment & Gear

A little bike plus 40 miles per hour probably equals inevitable disaster without some proper safety gear.

The importance of protective gear cannot be overemphasised. At the forefront, a DOT-approved helmet is a must. Other necessary items for excellent protection are gloves, padded boots, chest plates, and knee protection.

Most importantly, the rider should fit the bike. A child on a bike that is too tense or powerfully suited can easily lose control. Comfort and confidence on their bike are as important as the horsepower itself.

Supervision & Environment

Never let young riders ride alone. Anything can go wrong in a second. A parent or another responsible rider should accompany an adult supervisor to keep an eye on the behaviour of the riding subject, to set limits, and to respond quickly to any fall or breakdown.

One more: don’t ride on roads. Streets paved with blacktop are not intended for 50cc motorcycle dirt bike. A secure environment might consist of:

• Private property
• Established motocross tracks
• Open fields that have been left empty

These are the regular venues in which kids can safely race their 50cc motorcycle dirt bikes, out of traffic and the view of pedestrians.

Maintenance to Ensure Safe Performance

A bike needs to be serviced to be safe. Every ride should begin with first checking brakes, chain tension, tire pressure, and the oil level. Be particularly careful about cleaning the air filter, and check the suspension system for wear.

As soon as any strange noise or a loss of power occurs, shut off the engine and make an inspection right away. Most accidents happen from preventable mechanical failures due to a lack of maintenance.

BSEmotors Lightweight Engineering for 50cc Class

BSEmotors provides quality-built 50cc dirt bikes for fun and racing. Specialising in lightweight, performance-ready dirt bikes, this brand is intended for beginner riders who still want something to be performance-oriented.

The 50cc models from the brand have competition geometry, responsive suspensions, along with tuned exhaust engineered to deliver more punch than any type of recreational machine would.

What puts BSEMotors in this balance is that these are light and fast, yet they offer rideability and control. If your rider is ready to level up without going to a higher engine class just yet, BSEMotors offerings are worth a test ride.

FAQs

What’s the fastest 50cc dirt bike?

KTM 50 SX has earned its name as the fastest dirt bike in the 50 cc class. This dirtbike can achieve around 45 mph just out of the box, and maybe even more sophisticated with additional tweaks.

Is the speed of a dirt bike 50 cc too slow for kids and teens?

Yes. At 11 years old and older with a bit of experience, these kids and teens would best ride on a 70cc or 110cc bike because 50ccs are for the very early learning stages.

Can you make a 50cc dirt bike street legal?

Usually not. Even if you add lights and mirrors, most states don’t allow dirt bikes on roads without extensive registration and compliance with emissions standards.

How long does it take to reach top speeds?

5 to 10 seconds usually. That depends on rider weight, type of engine, and terrain.

Can an adult ride a 50cc dirt bike?

Yes. But they’ll feel cramped as well as out-muscled. A fun little toy for a quick jaunt, not a serious trail bike.

Bottom Line

50cc is an ideal entry point into off-road riding. These small, easy-to-handle machines also have a range of speeds of about 25 to 40 mph, which is welcome for a novice. Either buy it for a kid or try it yourself; it’s built for safe fun with room to grow.

Are you planning to buy a 50cc dirt bike? Then make sure it is the proper fit in a model of the right size, and you have the right protective gear, and match this with the ability of the rider. And please, don’t be in a hurry to modify it; learn the basics first, and speed will come later.