How Fast Does a 90cc Dirt Bike Go? (Top Speed)

Written by

James Stevens

Fact-checked by

Robert A. Verdin

How Fast Does a 90cc Dirt Bike Go

If you’re new to dirt bike riding, you might wonder how fast does a 90cc dirt bike go.

On average, a 90cc dirt bike can reach a speed of around 25 – 30 miles per hour, thus it is is an ideal engine size for beginners.

It’s not that surprising that you might encounter ones that reach up to 90 miles, yet, there are not that many powerful models with this engine.

In this article, we’ll have a look at the top speed of a 90cc dirt bike in more detail.

Typical Speed Range of 90cc Dirt Bikes

Indeed, a 90cc dirt bike features a more powerful machine than those with a 50cc or 80cc engine.


Min speed Typical range Top speed
90cc dirt bike 10 – 15 mph 25- 30 mph 50 – 60 mph (rare)

Typically, its speed range goes from 25- 30 in mph, though this would vary depending on the model.

Smaller dirt bikes, such as the 50cc and 80cc variants, have a lower top speed than 90cc dirt bikes. This makes them ideal for kids and newbie riders who want to gain some firsthand experience first.

1. 2-stroke and 4-stroke


This also depends on whether a dirt bike uses either a 2-stroke or a 4-stroke engine. In general, dirt bikes with a 2-stroke engine are faster due to them being lighter overall.

2. Dirt bike modification


That aside, any modifications you make to your dirt bike can also affect its top speed.

For example, if you want to make your bike faster, you can modify its sprocket. Specifically, you can replace the rear sprocket with a larger one and the front sprocket with a smaller one.

This way, you can improve your 90cc dirt bike’s top speed effortlessly. You might also want to consider installing a larger fuel tank to reach longer distances without refueling more often.

Determining the Top Speed of a 90cc Dirt Bike

It’s worth noting that the top speed of a 90cc dirt bike won’t be consistent. After all, there are several factors that can affect its top speed. Let’s look at some of them:

1. Engine Type


As mentioned earlier, dirt bikes with a 2-stroke engine can run faster than those with a 4-stroke version. This is because combustion only involves two steps instead of four. Besides, 2-stroke bikes are much lighter which contributes to their higher top speed.

2. Rider’s Weight


Another factor that can determine a 90cc dirt bike’s speed capabilities is the weight of the rider himself.

In other words, the heavier you are, the more impact your weight will have on your bike’s overall speed. This means that your dirt bike will have a much slower speed the heavier you get.

3. The Bike’s Brand


Lastly, you should also consider the brand of your dirt bike. After all, performances can vary depending on which brand it’s from.

Well-known brands such as Yamaha and Honda tend to produce dirt bikes with a higher top speed compared to lesser-known ones.

It also boils down to the quality of the materials they use which can have a significant impact on the dirt bikes they produce.


As you can see, how fast does a 90cc dirt bike go will depend on a variety of factors. But if we are to take into account its average speed, then it would fall between 95 and 97 miles per hour on average.

Then again, there are several modifications you can do to affect the speed capabilities of your bike. And depending on which modifications you add, it can either increase or decrease its top speed.

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James Stevens

James Stevens is an expert bike mechanic who knows everything from basic repairs to custom modifications. What sets him apart is his ability to explain complex concepts in a way that's easy to understand. Check out his content on Speedway if you need help with upgrades or modifications for your bike.