How Fast Does A 100cc Dirt Bike Go?

Dirt bikes are a fantastic way to get into and explore off-roading. These machines are prevalent in almost all age groups, from children to teens to adults. When it comes to choosing a dirt bike, there are numerous options with different speeds ranging from 50cc to 800cc.

That brings us to the obvious question: how fast does a 100cc dirt bike go?

Averagely, a 100cc dirt bike can hit a max speed of about 45mph to 65mph. However, it depends on factors such as engine type and strength, weight, suspensions, terrain, and rider’s experience.

Dirt bikes are built explicitly for off-road such as gravel, sand, river, or mud. The geometry of dirt bikes differs from a conventional motorcycle. If you have been wondering how fast a 100cc dirt bike can go, the factors affecting its speed, and how safe it is for kids, you’ve come to the right place.

Let’s get you through the factors, facts, and tips for your 100cc dirt bike.

How Fast Does A 100cc Dirt Bike Go?

A high-end 100cc dirt bike can reach a high speed of between 45mph and 65mph. This significantly depends on the type of engine (number of strokes), among other essential factors, that we’ll discuss later.

A 2- stroke engine dirt bike is lighter with more power and higher speed; most of them record a top speed of 55mph to 65mph. A 4-stroke engine dirt bike, on the other hand, is slightly heavier with less power and lower max speed; most of them reach a top speed of 45mph to 55mph.

Below is a summary chart comparing the potential speeds of different models of dirt bikes from leading brands:

BRAND	MODEL	TOP SPEED
Kawasaki	KE-100	50mph
Honda	CRF100	60mph
Yamaha	TT-R110E	55mph
KTM	SX105	60mph
Suzuki	DRZ-110	45mph

A two-stroke engine produces high speed and RPM compared to four-stroke engines; since combustion happens in two cycles. If speed is a concern to you, opt for a two-stroke engine. And try to go with a good dirt bike brand and have a good idea about dirt bike costs.

How Long Does It Take To Reach Max Speed Of 100cc In A Dirt Bike?

Generally, a 100cc engine rating means your dirt bike’s engine displacement is 100 cubic centimeters. Engine displacement is the volume displaced by engine pistons in the combustion cylinders. It’s usually measured in cubic centimeters (cc).

It takes approximately 5 – 10 minutes for a 100cc dirt bike to reach its maximum speed. A 2-stroke engine takes a shorter time than a 4-stroke engine. Also, it depends on the rider’s experience, terrain, and weight of the bike.

Different Factors That Affect The Speed Of A 100cc Dirt Bike Speed

Other than its engine type, several other factors can drastically affect the speed of a 100cc bike. Such factors include:

Rider’s Weight

Weight entails both the bike’s weight and the rider’s weight. All bikes have a weight limit depending on their suspension and build quality. The lighter the bike, the faster it goes and vice versa. 100cc dirt bikes can carry 200 pound people and more if you’re getting it from a good brand.

Terrain

A 100cc dirt bike can easily hit its max speed if ridden on suitable terrain. Dirt bikes are built for off-road riding; however, obstacles, gravel, dust, sand, and steep slopes can likely affect how fast you go.

Rider’s experience

Experienced riders have excellent bike handling techniques and are more confident to ride at high speeds. Beginner riders with no experience tend to ride slower.

Suspension

A Good suspension offers more comfort when riding and definitely affects how fast you can go. You have a higher chance to ride faster when your 100cc dirt bike is comfortable; that depends on your suspension.

Gear ratio

A dirt bike with a lesser gear ratio will undoubtedly have slower speed than one with more gear ratio. Some riders adjust their gearing system to boost their bike’s speed. A small rear sprocket delivers high top speed compared to a bigger sprocket.

Engine strength

The engine determines a substantial part of your dirt bike speed. The stronger/powerful the engine, the faster you ride. For this reason, it’s essential to keep your engine well serviced and maintained.

Ways To Increase Your 100cc Dirt Bike Speed?

Since dirt bikes are naturally by design adventure and racing machines, most riders get to the point of needing “more power.” While buying another more powerful dirt bike could be expensive, you can opt for cheaper modifications and upgrades to your bike. Such modifications are usually unnecessary for an average dirt bike rider but for experienced dirt bike racers.

You can make numerous adjustments to your bike; some are expensive. However, not every conversion is correct. Some could void your bike’s warranty or cause damage. Before doing this, it’s imperative to understand your dirt bike. Here is how to increase your 100cc dirt bike:

Boost compression

Changing the compression ratio of your dirt bike helps enhance its performance and increase speed. This process varies depending on the engine type. Changing a 2-stroke engine’s compression ratio involves milling the head. On the other hand, for a 4-stroke engine, you’ll have to replace its pistons with dome-shaped pistons.

Better compression means increased acceleration power; it comes with a sacrifice, though. Boosting your bike’s compression ratio also requires you to change the fuel type. You will need to use higher octane gasoline. It’s usually more expensive than premium or standard fuel.

Remove the revolution limiter

Use an impact wrench or a socket wrench to remove the revolution limiter. A Revolution limiter is a small gadget fitted on a bike to prevent exceeding a certain speed. It’s done to stop 100cc dirt bikes from going beyond 65mph or extending their engine life.

Use genuine engine oil

Use 100% synthetic engine oil. This type of engine oil is more effective for cooling and lubricating than regular engine oil. When pushing your 50cc dirt bike beyond its recommended speed, cooling and lubrication are essential for safety and performance.

Open the valves

The balance of fuel and airflow to the engine is significant for your dirt bike’s speed and performance. If you increase the air flowing to the engine, you boost its power. A camshaft is used to regulate the airflow by closing and opening valves.

A high-performance camshaft allows more air by letting the valves stay open for long. It’s recommended to hire a professional to help you with this job. They can easily determine which camshaft suits your engine setup and riding style.

Clean your spark plug

Cleaning or replacing damaged spark plugs improves your dirt bike’s acceleration. Also, upgrading to V-notch spark plugs can drastically boost the performance of your bike. These spark plugs ignite much faster than conventional plugs.

Remove carbon residue

More often, carbon residue accumulates inside your bike’s exhaust pipe, blocking airflow into the engine. This affects the performance of your bike. Disassemble the exhaust and muffler, and use a rag or brush to remove the buildup of carbon residue. You can also modify it by drilling holes to boost airflow into the engine.

Use the correct tire pressure

Every tire has a recommended and maximum air pressure. A well-inflated tire reduces ground resistance, thus allowing you to ride faster on your 100cc dirt bike. So, be sure to check the pressure before you head out.

How Safe Is 100 CC Dirt Bike For Kids?

While 100cc dirt bikes are safe for kids, they are not recommended for kids under ten years. Compared to 50cc dirt bikes, 100cc bikes have higher speeds that can be difficult for kids to handle. These bikes are suitable for kids between 10 – 12 years.

Remember, your kid’s safety should be your priority. Ensure they put on proper safety gear whenever they ride. Also, they should maintain the gear that they are comfortable handling. Suppose you’re worried about your kid’s 100cc dirt bike speed; you can opt for a kill switch or throttle limiter to regulate their speeds.

Also, make sure that you’re looking into the dirt bike size chart to know which size bike you should go for.

Final Words

100cc dirt bikes are among the fastest dirt bikes available in the market. With potential high speeds of 45mph to 65mph, dirt bikes are an excellent choice for motocross and off-road racing. These bikes accommodate a wide range of riders from 10 years to young adults.

If you are an experienced rider who wants more power and faster speeds on your dirt bike, we hope you find the tips above helpful. Keep in mind your safety and other riders as you modify your 100cc dirt bike for faster speed.