How Fast Does a 100cc Dirt Bike Go

Updated on June 13, 2022

A 100cc dirt bike can reach speeds of 50-60 mph. Top speed is dependent on the engine’s tuning and presence of an additional carburetor even at 80 mph, which is faster than most cars travelling on residential streets.

Factors That You Must Know When Buying a Dirt Bike:

1. Seat Height

First, check sure the seat is at a height that is right for your body type. Help your child appreciate the difference in height with the different 100cc motorcycles available. When purchasing a bike from a shop, always wear high heel riding boots rather than plain shoes, and always bring the same footwear with you. Using the same pair of boots you purchased, you can test them out before you buy them.

As a result, you will hear and feel more bumps if you don’t have your feet firmly on the ground. As a parent, you should always keep your child’s comfort in mind while they are riding their bike. Lower the suspension and handlebars on some dirt motorcycles to make it easier for your child to get on and off of.

It’s also possible to inquire about cutting the seat to make it more comfortable for your children. At the other end of the spectrum, teaching your children to ride a dirt bike while they are young gives them more control over the vehicle.

2. Size of the Engine

For children between the ages of 5 and 9, a 100cc engine is ideal. In part, this is due to the bike’s lighter weight and less powerful engine. The 50cc engine is an excellent starting point for kids who have never ridden a dirt bike before. Giving your child the ability to practise throttle control with a 100cc engine is a great benefit.

From 50cc to 250cc engines are available for adult bikers. When riding a 100cc at 50 mph, kids get the same thrill as adults. You may wish to consider a more advanced dirt bike for your child if he or she does well on the one he or she now has and is confident on.

If you knew these things, you’d also know when to upgrade to a more powerful engine.

  • A child’s leg climbs to the height of his ear when he is riding a bike.
  • They may find success in motorcycle racing.
  • They prefer to ride a manual bike rather than an automatic one.
  • Your child’s wish list would include a vehicle with better suspension, brakes, and wheels. All of these characteristics can be found in more powerful bikes.

Even the smallest modifications in engine size can assist less experienced riders. Larger engines allow for better clutches, transmissions, and other components.

3. Size of Wheels

Large and small wheel options are available for bikes with 125cc or less engines. “Big wheel” dirt bikes have front wheels that measure 19 inches and rear wheels that measure 16 inches. With a 17-inch front wheel and a 14 inch back wheel on a smaller dirt bike model, it’s much easier to manoeuvre in tight spaces. Wheel size can have a significant impact on the bicycle’s suspension, gearing and swingarm on bikes with two similar wheels.

Both wheel designs have their advantages and disadvantages. Using a larger wheel improves the vehicle’s stability. However, little wheels are more suited to tight turns because they are lighter. They are heavier, but they have more tyres than smaller-wheeled bikes.

As the vehicle’s height depends on the frame’s dimensions, wheel size also has an impact. When youngsters ride bikes with different sized wheels, they will be able to learn more quickly and easily.

4. Type of Engine – Two-stroke vs. Four-stroke

Dirt bikes under 100cc can be equipped with either a two- or four-stroke engine. Because every two crankshaft rotations provide power in a four-stroke engine, the bike’s top speed is directly impacted. Because of the suspension system, it provides a smoother ride with less jolts. Unlike four-stroke engines, two-stroke engines produce greater power per crankshaft revolution.

To put it another way, a 65cc two-stroke engine may produce the same amount of power as an 80cc to 100cc four-stroke engine. Depending on the type of track it is capable of running on, a two- or four-stroke engine will have a vastly different performance. Two-stroke motors are always preferable for trail and pleasure riding. Four strokes, on the other hand, are more steady and manageable when the track is bumpy.

5. Electric vs. Kick Start

Push-button ignition is a common feature on most entry-level motorcycles. Make a decision on which one will be easier for the kids to get started with. Electric starters require little more than a little TLC, but you must use them with caution.

A kick starter is difficult for children to use since they don’t understand how it works. But this only happens if you are a beginner and become used to the kick action after. Until recently, electric starters were only available on older versions of dirt bikes, but this feature is now available on even adult-sized dirt bikes.

6. Transmission

It is common for dirt bikes with engines under 100cc to feature an automatic clutch. Kids learn to steer and balance more easily with an automatic clutch since they don’t have to shift gears. The manual clutch on the Suzuki JR80 dirt bike makes it a decent entry-level option before moving on to a more advanced model.

It also has an adjustable suspension, four-stroke engine, and more power range than the competition. As a beginner, this is an excellent place to get their feet wet with motorbike customising. As soon as your youngster has grasped the fundamentals of driving, switching to a clutch pedal is always a good idea.

Your child will enjoy shifting gears manually as the vehicle accelerates and decelerates. This skill will come in handy when your youngster rides a 250cc or larger motorcycle in the future.

How efficient is a 100cc dirt bike?

It saves a lot of time. In spite of the fact that they are uncommon in competition, 100ccs are a great way for individuals to improve their skills. When it comes to the speed at which 100cc motorcycles may reach, the range is 40 to 55 miles an hour. A speed of over 100 miles per hour has been admitted by the experts. You’ll cover 88 km per hour at 55 mph.

The bike is a potential option because it can be driven comfortably at speeds of up to 60 mph. If you have the money to spare, a more powerful model, such as the kx100, is an option. According to consumers who have ridden them, a quality 100cc bike is substantially more enjoyable than a 150cc bike for many of them.

There’s a good chance that a 100cc motorcycle will be able to keep up with you. As far as I’m concerned, there’s nothing better than an 80 or 50cc engine on a motorcycle. This means that buying a 100cc motorcycle is not going to change your attitude.

What’s The Difference Between 100CC and 50cc Bikes?

There are many differences between a 50cc and 100cc bike and some are listed below:

  • The maximum speed limit: The top speed of a 100cc motorcycle is between 40 and 55 miles per hour. When translated to kilometres per hour (kph), this is around 80 kph (kph). On the other hand, a 50cc dirt bike can reach a top speed of 25-40 mph. This equates to a top speed of about 64-65 kph.
  • Ease of control: The peak speed of a dirt bike has a direct impact on how fun it is to ride. No fears or problems when riding your bike in the range of 25 to 40 miles per hour (mph). A 50cc motorcycle is easier to ride than a 100cc motorcycle, and vice versa. When compared to a more powerful bike, a 50cc bike is a lot simpler to outrun. “
  • The Weight of the bike: Many 50cc motorcycles are lighter than 100cc motorcycles due to their lower size. Due of their proximity, it may be difficult to identify the difference between these two items.

Which One Is The Best 100cc Dirt Bike?

The ideal dirt bike is the culmination of a number of factors working in concert. Motorcycle acceleration isn’t solely dependent on the vehicle’s engine, as many people believe. We assist you in developing the skills necessary to go quicker on your bike.

The first thing we notice about the kid’s dirt bike is that it has a lot of tyres. The engine specifics follow, and the bike’s height is the first thing you need to know. If your child’s feet touch the ground when seated on the bike, the bike is the right size for your youngster.


The Kawasaki KX100 is an excellent choice for a 100cc dirt bike. Top speed for 100cc engines is 50MPH. Motocrossers just getting their feet wet will find enough to like about this bike. If nothing else, you’ll be prepared to handle the more difficult bikes you get in the future.

Children can ride bikes with capacities as little as 100cc. To become a professional in the field, they will learn new skills from this experience. You can experience the thrill of two-wheeled independence on a 100CC dirt bike.