If you ride a dirt bike, even a trail bike like a TTR 125, you’re almost guaranteed to want to know how fast it goes. As dirt bike riders, we need to know how fast our bikes go. In this article, we’ll be covering the top speed of TTR 125. Here you can find the complete guide covering the Yamaha TTR 125.
What is the top speed of TTR 125?
Yamaha originally helped popularize off-road motorcycles, what we know today as dirt bikes, after starting out as a manufacturer of musical instruments and other items.
Today, Yamaha is often considered to have some of the fastest machines. The YZ250F is the fastest 250, the TTR 110 is the fastest pit bike, the YZ450F is one of the fastest 450, and so on. (Yamaha’s YZ 125 isn’t the fastest 125, but it’s fighting for that position.)
What does that mean for the trail bikes from Yamaha? How fast are they?
The top speed of TTR 125 is about 45-55 mph.
The TTR 125 top speed is about 10-15 mph slower than the TTR 230. It’s also quite a bit slower than the top speed of YZ85 even though the TTR 125 engine is bigger in cc’s (this is due to a 2-stroke engine versus a 4-stroke engine).
How does the Yamaha TTR 125 top speed compare to Honda’s equivalent bike, the CRF125F? Read about the CRF125F top speed here.
That said, there are a few things that have a big impact on this top speed number.
What impacts the TTR 125 top speed?
It can be pretty difficult to know the true top speed of a dirt bike. The reason for that is that there are so many variables that go into determining the top speed.
Let’s look at some of the items that impact the top speed.
Modifications
Modifications and after-market parts are the items that impact the top speed of TTR 125 the most. If your TTR 125 has engine work and a pipe, that’s not comparable to a stock TTR 125.
The top speed of a stock TTR 125 will be significantly less than the top speed of a TTR 125 with a bunch of work done to it. Especially if that includes engine work and a big bore kit.
The more work that’s done to the bike, the more the top speeds are going to differ.
You might be thinking, “okay, that makes sense, but what is the top speed of a TTR 125 before I make any mods to it?”
If that’s what you’re wondering, it’s a bit easier to answer, but there are still more variables to consider, such as gearing, riding conditions, the rider, and more.
Gearing
The item that has the second largest impact on the TTR 125 top speed is the bike’s gearing.
For those unfamiliar, gearing refers to the size of the front and rear sprockets, specifically the relationship between the two.
Riders choose different gearing based on the conditions they’re riding in. If the rider is racing supercross, they generally want more acceleration (known as more bottom end). To do this, they’d use a smaller front sprocket or a larger rear sprocket. This is a low gear ratio.
If the rider is racing motocross, they may want more top speed (known as top end). To do this, the rider would use a larger front sprocket or a smaller rear sprocket, which is a higher gear ratio.
This may sound like a small thing, but it has a huge impact on the top speed of a TTR 125 (any dirt bike, really). Depending on the gearing changes, it can increase or decrease the top speed by more than 5 mph.
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Riding Conditions
Another item that can impact the TTR 125 top speed is the riding conditions. This can be the location where you’re riding and the conditions of what you’re riding on.
For the location, are you riding at sea level or thousands of feet above elevation? Generally, dirt bikes produce more power closer to sea level than at high levels of elevation. Of course, this will impact the top speed of TTR 125.
If you’re riding in Colorado, thousands of feet above sea level, your TTR 125 top speed is going to be lower than if you’re riding on the coasts of the US at sea level.
Also, for the location, are you riding in the woods, on a motocross track, or on a paved road? Are there hills or is it flat?
If you’re riding in the woods, your TTR 125 top speed might be limited by trees or other obstacles. If you’re on a motocross track (why are you on a moto track with a TTR 125, though?) you can only go so fast while maintaining control and staying within the course.
This type of location consideration also impacts the conditions of what you’re riding on. If you’re riding on a flat paved road your Yamaha TTR 125 top speed is going to be entirely different than if you’re riding on a tight trail in the woods.
Rider
Who is riding the bike is also going to impact the top speed. This has an impact on the top speed for two reasons: 1) their size/weight, and 2) their ability.
First, let’s consider the rider’s size and weight. Someone who weighs 450 pounds is not going to be able to go as fast on the bike as someone who weighs 150 pounds. The top speed of a TTR 125 is going to go down the heavier the rider is.
Also, someone who is a skilled rider can likely get the Yamaha TTR 125 top speed to be a bit higher than someone who is brand new to riding. A rider who can quickly and smoothly shift through the gears can hit a higher top speed on a TTR 125 than someone who is just learning how to use a clutch.
The Yamaha TTR 125’s size makes it a great fit for both bigger kids and adults to ride. Bigger kids can ride it as they grow up and move on to bigger and bigger bikes. Adults can ride it as a form of pit bike.
Other Items Impacting the Top Speed of a TTR 125
A few other items that will impact the top speed are the condition of the bike, riding weather, and how the top speed is being recorded.
A bike that hasn’t had maintenance kept up on it or has issues and isn’t running properly won’t be able to reach the peak top speed that the bike is capable of. The top speed of a bike that is maintained very well and running perfectly will be faster than that of a bike that is not taken care of and running like crap.
Maintenance doesn’t only equal oil changes, air filters, and keeping the bike clean. It includes how old is your piston? When was the last time the top end (or bottom end) was updated? The older and more worn these engine parts are, the slower the bike will go.
Similar to location, the weather you’re riding in can have an impact on the TTR 125 top speed. If you’re riding in the rain, causing the pavement to be wet, the top speed is likely going to be lower than it otherwise could be.
Also, the temperature you’re riding in can impact the top speed of your bike because it can impact how the bike is running. The TTR 125 is carbureted so it might not run right in cold or humid temperatures, which would lower the bike’s top speed.
The final item we’ll mention that can impact the TTR 125 top speed is how the top speed is being recorded.
Technically, this doesn’t change the top speed the bike is actually going – it only changes what you record it as. If you record a bike as going 30 but it’s really doing 45, that doesn’t mean the bike did 30. It did 45, you just recorded it inaccurately. I digress…
If you are recording the top speed with an onboard GPS, that’s likely going to be more accurate than someone pointing a speed gauge at you as you go by.
Wrapping Up the TTR 125 Top Speed
When it comes down to it, most people just want to know how fast their bike is capable of going. All the mods and items covered above are important and impact how fast their bike goes, but, most people would be satisfied with simply knowing how fast, in general, their bike is. In that case, the top speed of a TTR 125 is about 45-55 mph.
Frequently Asked Questions About the TTR 125 Top Speed
A TTR 125 can go about 45 to 55 mph.
Yes, the TTR 125 has a rev limiter.
You can make your TTR 125 faster by putting in a big bore kit, installing an aftermarket pipe, and/or changing the gearing.
No, a Yamaha TTR 125 is not a 2 stroke.
A TTR 125 weighs about 198 pounds wet.
A TTR 125 seat height is 31 inches tall.
