Are you wondering how fast a 450cc dirt bike go? But, as we will get to see, this is not necessarily possible on all 450cc dirt bikes. Only a few models can sufficiently achieve significant speeds for consideration on how fast does a 450cc dirt bike go.
So, how fast does a 450cc dirt bike go? The average max speed of a 450cc dirt bike is 87 miles per hour for most of the models. However, there is a lot that goes into determining the speed. In essence, this means the speed of a 450cc engine will vary due to different factors. These could be due to bike modifications, rider weight, engine stroke, or even the brand.
The engine stroke and manufacturer are particularly interesting aspects that get to affect the ultimate speed. That is why I have made the next compilation of 450cc dirt bikes and their top speed. You will find a review of how each manufacturer attempts to answer how fast does a 450cc dirt bike go with high speeds.
You may also like this post that I wrote: How Fast Does a 125cc Dirt Bike Go?
Two-stroke vs. Four-stroke dirt bikes
Learning how fast does a 450cc dirt bike go is not particularly challenging. However, you will have to understand what type of engine you are starting on. Technically, there are two engine styles available for a dirt bike. On the one hand, you have the two-stroke dirt bikes, which are often lighter and faster models with a bit of a hands-on attitude.
You will also come across the four-stroke dirt bikes, which are a bit of the opposite. They are more complex, with slower acceleration and lower top speed. Yet, four-stroke engines make up for this when it comes down to maintaining consistency in the high speed.
In particular, this is a significant reason why you will find the 450cc dirt bikes with this engine type. From the fastest to the slowest 450cc dirt bike, I came across all run a similar engine type. So, if you are thinking of getting your answer on how fast does a 450cc dirt bike go here are the answers.
How fast does a 450cc 4-stroke dirt bike go?
KTM 450 SX-F
Top speed- 110 mph
There is no dirt bike, which illustrates how fast does a 450cc dirt bike go than the KTM SX-F. In short, the KTM sought to its desire for speed, perfection, and power delivery to its core.
I say this due to how the brand upgrades this dirt bike to blow riders’ minds. It introduces a new high-tech frame, bodywork, and redesigned chassis to achieve a lightweight upgrade.
Similarly, the 450 SX-F gains a better top speed due to most of the in-built upgrades. Since it’s lightweight, you can expect a faster and easier rider on the track. The figures suggest this as the specifications put the top speeds at 110 mph for the stock versions.
You can also expect KTM to also top this top speed with an equally powerful horsepower and torque measure. For this 4-stroke engine, you can expect a peak horsepower output of 53.2 hp at 9,500 rpm while revving up the track.
Another priceless advantage comes in the amount of torque the 5-speed transmission can produce. At 33.7 pound-feet of torque at 7,000 rpm, it’s enough to force to give you more control over the dirt bike even in rough surfaces.
Top speed- 90 mph
Honda seems never to slouch when it comes to answering how fast does a 450c dirt bike go. The brand does this by providing several 450cc dirt bikes to meet the speedsters’ criteria for a road weapon.
For this version, Honda out the CRF450R with a single-cylinder 4-stroke engine and a 5-speed chain transmission. That is alongside the already 449.7cc displacement that combines with the liquid cooling system to ensure optimal engine functions.
Additionally, the manufacturer also makes a breakthrough in the engine output specifications. Years of updates and tweaks have seen this Honda increase its speed quality, power, and reliability. For now, the CRF450R is already famous as one of the fastest, with speed cranking up to a 90 mph. It is among the highest you will come across for the 450cc dirt bike category.
But the Honda manufacturers don’t end there. With such a top speed, you can expect an equally powerful engine output. True to this, the Honda CRF450R cranks up a peak output of 53.75 hp at 9,760 rpm for the horsepower. That is aside from the torque measure of 33.24 pound-feet of torque at 7,390 rpm .
Top speed- 100 mph
As per the specs sheet, the impressive 450 RS has an illustrious show of potent speed and power for enduro and trail riding. On its stoke mode, this 450cc 4-stroke unit gives out a top speed of 100 mph on trail riding terrain. What’s even more impressive is how the Beta 450 rs can accelerate to catch up with its high speed. The Beta 450 RS can achieve an impressive 0 to 60 mph within just 5.25 seconds for acceleration.
The mention of speed and acceleration also go hand-in-hand with the engine power you will expect. Beta realizes the need to have the rate equals the amount of power and torque output. Likewise, this also means this awesome dirt bike also packs plenty of horsepower and torque. At peak performance, the 450RS can produce 43.71 hp, which is potent enough considering the high speeds. That is alongside the peak torque of 29.59 lb-ft, which helps deliver the top speed of over 100 mph.
Top speed- 90 mph
Can you go racing on the Honda CRF450X? Probably yes. The most significant handicap is not speeding or power. Honda did make this 450cc as a massive machine that operates far out of line that most Honda bikes.
It is because the CRF450X packs a user-friendly engine thanks to the linear power delivery. By using this mechanism, Honda ensures that this dirt bike has a smooth bottom-end for a better riding experience on rough terrain.
I also got to experience the difference in riding experience after taking out the CRF450X for a controlled test. My result would see this 40stroke engine pick up in the midrange while also pulling well for the top=end speed. Even after achieving the top speed of 90 mph, the throttle was still stable and without any issues.
The CRF450RX also has a bit more power control when riding at high speeds. In particular, the six-speed transmission gears give out an unnoticeable even power output during shifting. It helps the engine allow for progressive gearing despite the high production of 52.7 hp to the ground at 9,440 rpm.
The fact that the 450X improves ground handling means the torque is also predictable when riding. Rough terrains with particularly significant impacts would seem to fit the CRF450X with its 33.6 pound-feet of torque at 7,450 rpm . It would conquer the off-road terrain and hold up well when it comes to handling.
Kawasaki KX 450F
Top speed- 89 mph
The Kawasaki KX450 is a new machine from its previous version over the years. Currently, the 450cc model enjoys a major engine, chassis, and suspension modifications to improve speed and performance.
A rundown of the changes reveals plenty to admire in terms of how fast does a 450cc dirt bike goes. First, the 4-stroke single-cylinder engine has a 449cc displacement with a liquid-cooling system.
The brand also quotes this Kawasaki as an old-school model with a kick start system and five-speed chain drive. Combining these features gives the KX450 a lean operation that produces a powerhouse in the paddock. For example, the engine maintains an edge by having a competitive top speed of 89 mph. It enables the rider to have quicker lap times with the leanest ergonomics, also playing a hand in this ability.
As you also know, Kawasaki makes no mistake when making the KX450 a powerhouse. Part of the model’s engine boasts of having a peak power of 52.63 hp at 9,480 rpm for the underlying stock edition. Other statistics suggests they could be more horsepower with the right conditions. However, for now the standard power performance sits that slightly above 52 hp.
Kawasaki further compliments this immense speed and horsepower with an equal measure of torque. The brand matches these features with a torque measure of 32.80 pound-feet of torque at 6,730 rpm as peak figures. Technically, these figures showcase that the KX450 matches the torque provides enough traction. Therefore, expect to get around corners quickly with more power to the ground with the Kawasaki KX450.
Top speed– 85 mph
Husqvarna has a reputation for producing and fine-tuning excellent dirt bikes with good engine packages. The case is even more distinct when it comes to the manufacturer’s 450cc model, the FC 450.
As a rider, you will run into it as a premium dirt bike model that packs the necessary speed and power. Enduro and race riders will especially love the top speed of 85 mph for their riding experience. Other reviewers put the high speed at 90 mph, but I would count on the former since we are reviewing the stock version. The variations could be due to several factors, but that’s another day’s topic.
On the part of power, Husqvarna was not short on relishing their premium dirt bike. For the FC 450, you can expect a power production of 55.64 hp at 10,000 rpm. That is a little more powerful than other 450cc models available in this category. An example is the FX 450, which packs a top power output of 52.34 hp at 9,360 rpm.
Additionally, this is not the sole area where the FC 450 wins over its competition. The torque measure is also impressive enough to feature among the top models on how fast does a 450cc dirt bike go. On the Dyno test, this 450cc dirt bike churns out a total 33.2 pound-feet of torque at 6,800 rpm. I count this as enough power to get you through the tough enduro, trail, or muddy race track without a glitch.
The 450cc dirt bike category is a unique class that does not have plenty of models. However, this does not mean that it does not have one of the fastest dirt bikes in the world. As you can tell, how fast does a 450cc dirt bike go pretty much sums up this point. But take note that the top speeds are subject to other factors. However, for the stock models, they are the speeds that define how fast does a 450cc dirt bike go.