How Fast Does a 140cc Dirt Bike Go? – Top Speed

Written by

James Stevens

Fact-checked by

Robert A. Verdin

As you dig a little deeper into the world of dirt biking, you have to ensure familiarity with the engine types available and their potential. So it’s understandable that you may want to know details about how fast does a 140cc dirt bike go.

Designed for young teenagers and beginners, a 140cc dirt bike’s average speed ranges from 50 to 60 mph. However, its speed also varies depending on the conditions, which we will detail below.

Typical Speed Range of 140cc Dirt Bikes


The 140 cc dirt bikes fall under pit bikes, meaning their engines are smaller than normal dirt bikes. They also have a lower top speed; hence, the pit bike engine is designed for pit racing, beginner riders, and children.

Most 140cc dirt bikes have an average speed of 50 to 60 mph. That said, it’s possible for them to reach a max speed of 80 mph if the rider is light and the conditions are favorable.

To give more context on the typical top speeds of 140cc dirt bikes, here is a list of popular models on the market.

Dirt bike model Top speed(in mph)
Kawasaki KLX 140 50
Crossfire 140cc 59
Thumpstar TSR 140cc 55
HHH TaoTao 140cc DB X1 68
Pister Pro MXR 140 60+
Piranha P140RE 55

Factors Influencing 140 Cc Dirt Bike Speed

How fast a 140cc pit dirt bike can go will vary depending on the following factors:

1. Rider weight


Weight does impact the speed by slowing down the maximum speed if the rider is heavy.

2. Bike conditions


Bike conditions refer to the quality of the parts as well as the modifications done. Generally, brand-new dirt bikes can achieve top speeds faster than used ones.

Modifications, such as changes in gearing, do improve the bike’s performance. Proper bike parts maintenance also helps ensure the longevity of its speed.

3. Weather and terrain conditions


The top speed attained by your 140 cc dirt bike also depends on the overall weather conditions and the terrain it is subjected to.

Your dirt bike can reach maximum speed smoothly if the terrain has fewer bumps and uphill climbs. Weather-wise, it would be good to do rides without weather interference, such as snow, strong winds, and heavy rains.

4. Rider skills


We also take the rider’s skill as a factor in maximizing a dirt bike’s speed. A novice rider might not be as well-versed as an experienced one in quickly navigating a dirt bike.


How fast does a 140cc dirt bike go? After reading this blog post, you certainly have the answer for yourself. Hopefully, it’s helped you determine if these bikes’ top speed suits you or your kids.

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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.