How To Make A Yamaha TTR 125 Faster

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In 2007 I got my first dirt bike, which was a TTR 125. After a few years, I wanted to squeeze a little bit more juice out of it and that’s when I decided to do the research on how to make a Yamaha TTR 125 faster.

What a lot of people don’t seem to realize is that a TTR 125 is NOT a racing bike and is NOT designed for speed. However, even though a TTR 125 was designed to be a reliable and comfortable bike that’s great for longer rides, there are a few things you can do to make it slightly quicker. To make a TTR 125 faster you’ll need to:

  1. You can get a new exhaust system from BBR.
  2. You can remove the airbox rubber snorkel.
  3. You can add a 14 tooth front sprocket.
  4. You can drill small holes in the exhaust opening and air filter.
  5. You can let it breath more with a high flow airbox or free flow muffler.
  6. You can replace the camshaft with a mid-top end grind.
  7. You can increase the displacement with a big-bore kit.

Those are all of the potential ways I could find that could add some speed and power to your TTR 125. The only thing I ended up doing was getting a better air box and filter. I didn’t really want to be messing around and adding parts so I just kept things the way they were.

That being said, I don’t know which of these would work best but I’m sure they’ll all make the bike fractionally faster. Some of them won’t increase the top speed but will get there a bit faster.

Again, the TTR 125 isn’t a race bike and the best thing to do would be to get a different bike (I also have a Husqvarna FX 350). I love my TTR though because it’s way better on hills and rough terrain compared to most 2 stroke bikes. If you’ll be doing long trips on rougher terrain there is no way you’ll last on a 2 stroke bike (that’s just my opinion though).

How Fast Does A Yamaha TTR 125 Go?

The top speed of a TTR 125 will all depend on the rider. If one bike has a 100 lb rider and another bike has a 200 lb rider, the first bike will be able to go a lot faster. That’s pretty obvious.

So, how fast does a TTR 125 go? On average it’s between 45-55 MPH. I’m around 175 lbs so it would be closer to the 45 for me but back in the day when I was much lighter, I could get it going quite a bit more.

I’ve heard stories about people actually doubling the horsepower on their TTR with some of the mods above (from 7 to 14 hp). I have no idea if that’s true or not but if it is, you’ll probably be able to get closer to 60 MPH.

How To Make A TTR 125 Louder?

Since you automatically get cooler when you make your car, truck, or bike louder let’s talk about how you can make your TTR 125 roar. I’ve tried a few of these (on mine or my buddies bikes) but I generally use the bike for hunting and being loud is not really a good thing to do.

The easiest and least expensive thing you can do is to do an exhaust mod and remove the spark arrestor. This isn’t really the best thing to do but it does work. Also, I wouldn’t recommend doing this in the summer if you’re near trees (it’s called a SPARK arrestor and it stops sparks from coming out of your exhaust). You could possibly get a fine or worse, start a fire. Here’s a quick video:

The second thing you can do is change out the exhaust. This is an overall better thing to do but it will cost you a bit of money. If you are looking for this option I’d recommend the FMF Powercore 4.┬áHere’s what it sounds like:

How To Do A TTR 125 Airbox Mod

One of the easiest ways to get a bit more power out of your dirt bike is to improve its breathability. Just like any other engine, if you can get more air flowing through it it’ll improve the horsepower.

The easiest way to do this is by doing an airbox mod to the bike. It’s pretty hard to explain but I’ll list the steps and also include a video below that walks you through it.

  1. The first thing you’ll want to do is remove the seat to get access to the airbox.
  2. Next, you’ll remove the side cover of the airbox.
  3. Then you’ll pull out the rubber snorkel (on the top of the airbox).
  4. You’ll then see a screen inside of the airbox and that can be taken out to increase airflow.

Like I was saying before, I’m not the biggest fan of messing around with my vehicles because I’m not a mechanic and I don’t want to mess anything up. I’d way rather get a bigger and faster bike (but that’s just me).

I’ve tried a few of these and have heard about the rest from other people. Doing all of them won’t make your bike twice as fast but you should notice a slight improvement in the responsiveness and overall power.

Let me know your thoughts and any questions you have. Like this article? Feel free to give it a share!

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Jon Webber

I'm by no means an outdoors or fishing expert, but it's something I've been interested in for over 20 years. This site is where I test out different gear and techniques to see what actually works.

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