Going fast on a dirt bike is a blast but you are here because you are wondering how fast a 50cc sized dirt bike can go?
The speed of a 50cc dirt bike depends on a few different variables.
Things that effect the speed of a 50cc dirt bike
- Transmission Type
- Motor type
For example a Honda CRF50 has a different transmission, motor, and gearing that a KTM 50 SX. Both these 50cc dirt bikes fit within the “50cc” engine size but are totally different dirt bikes.
Basically within the 50cc dirt bike world you have 2 types of dirt bikes
- 50cc Trail dirt bikes
- 50cc Motocross dirt bikes
Its important to note this as each has its own top speed.
50 CC dirt bike gearing has an effect on overall top speed
Smaller Sprocket = Higher top speed
Gearing is also a MAJOR factor when it comes to over all top speed. You can put a smaller rear sprocket on and it will give you an overall higher top speed.
Putting a LARGER sprocket in the rear will gear the dirt bike down, this will result in a LOWER top speed.
50 cc transimissions effect over all top speed
The transmission on these 50cc dirt bikes also has a major effect on the overall top speed. For example the trail 50cc dirt bikes like the Yamaha TTR50 come with a 3 speed semi-automatic transmission. These are big and bulky and only give you 3 gears.
The transmission on the KTM 50SX is a centrifugal clutch that does not have any gears but as the motor spins faster the shoes on the clutch engage on the rim of the clutch housing transfering the power to the wheels.
This type of clutch will allow for higher top speed than a stock 3 speed semi-automatic transsmission.
Top Speed on 50cc Dirt Bike
Top speed on most 50 cc dirt bikes is between the folllowing speeds:
Fastest 50cc Trail Dirt Bikes:
- Honda CRF 50 Top Speed : 33 MPH
- Yamaha TTR 50 Top Speed: 32 MPH
Fastest 50cc Motocross Dirt Bikes:
- KTM 50 SX Top Speed: 45 MPH
- Husqvarna TC 50 Top Speed: 45 MPH
- Cobra 50 SRX FWE Top Speed: 45 MPH
- Cobra 50 SRX KING Top Speed: 45 MPH
How do you make a 50cc dirt bike go faster. The first thing is gearing. Start with smaller sprockets and this will allow you to have more top speed. The second is to find more power. This can be done by a better airfilter, exhaust system, and engine work. This allows your dirt bike to get more power on the top end which can also allow for more power.
However, I cannot stress enough that the sprockets in the end is what will have the most effect on your top speed. Changing the 3 speed gear box on the Yamaha TTR 50 or Honda 50 CRF is going to be VERY tough and not really a possbility for most people.
How to make a 50cc dirt bike go faster:
- More Power
- Aftermarket Exhaust
Overall, the 50cc motocross dirt bikes come with a 2 stroke motor that tends to make more horsepower per cc then a 4 stroke. The trail dirt bikes come with a air cooled 4 stroke motor which are easy to ride but not really built for speed.
The FASTEST 50CC dirt bike is a 50cc Motocross dirt bike
Like I mentioned above the Honda CRF50 and Yamaha TTR50 are dirt bikes that are built for trail riding. They cannot go as fast as the 50cc motocross dirt bikes. They are not built for racing.
The 50cc motocross dirt bikes will have the highest top speed of the 50cc dirt bikes!!