Best CRF50 Exhaust (FMF, Pro Circuit, Yoshi, etc.) – Worth Buying?

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With all of the different options to choose from, picking out the best aftermarket exhaust for a Honda CRF50 dirt bike isn’t as cut-and-dry as you might think. It depends on what exactly you’re looking for from your pipe that determines which exhaust system is best. After HOURS of research and analyzing, I’ve put together a list of what I think are the absolute best CRF50 exhaust systems, pipes, and upgrades.

Stock Honda CRF50 dirt bike on white background

With that, I’ve also specified which are the top CRF50 exhaust systems for each different need. Some of these pipes are designed specifically for top speed (not many of us care about that on a 50cc), and some are designed for more low-end and midrange torque and power (not sure about you, but that’s what I’m after).

In addition to the best-performing exhaust pipe, we’ll also take a look at the best-sounding exhaust pipe, as well as which one is the best bang for your buck.

IMPORTANT: Some of these exhaust systems are made for modded bikes (big bore kit), while some are more suitable for the stock Honda dirt bike 50cc. Don’t worry, I noted which pipes work best for which types of dirt bikes.

Yoshimura CRF50 Exhaust (RS-2)

While it is still debatable, I have put Yoshimura in the top spot. The RS2 Yoshimura CRF50 exhaust is well-built, looks great, and actually delivers performance gains.

Close up of the Yoshimura Exhaust for Honda CRF50

Overall, this full CRF50 exhaust system is (in my opinion) the “best” one out there, but it’s not for everyone. However, unlike the CRF110 Yoshimura exhaust, your 50cc should be bored out (BB 88 kit would be great) to get the most out of this exhaust system.

Therefore, unless you’ve done a few Honda CRF50 mods, buying this aftermarket exhaust is mostly about looks and sound, and less about performance.

Either way, here are some of the main highlights as well as some of the important pros and cons of this exhaust system.

Features & Highlights

  • Unique diamond shape
  • Stainless steel head pipe, tail-pipe, and end-cap
  • Great (not too loud) sound
  • Designed for bikes with a big bore kit

Positive Reviews

  • Easy to install
  • Looks good
  • Great tone
  • Improved throttle response
  • Works with big bore kit

Negative Reviews

  • Expensive
  • Doesn’t come with a new exhaust gasket

In the end, you really can’t go “wrong” with this CRF50 Yoshimura exhaust, but if you’re on a budget or have a stock CRF50, there are better options like FMF (info below).

View pricing and read reviews about this Yoshi pipe on Faster-Minis.com.

Pro Circuit CRF50 Exhaust (T4)

As far as exhaust systems go, Pro-Circuit is, and has been, one of the true industry leaders. This company has been around for a long time and they seem to always produce some of the best aftermarket exhaust pipes around…

And the Pro Circuit CRF50 exhaust is no exception!

Arrows point at the Pro Circuit CRF50 exhaust

Similar to the Yoshi exhaust above, the Pro Circuit CRF50 exhaust is best suited for a bike with a big bore kit. Does that mean that you HAVE to have a big bore kit? No. But, if you want to get the most out of the exhaust, and out-pull a Yamaha TTR50, a big bore kit is a really good idea.

Still, here are the main highlights, as well as the positives and negatives of this Pro Circuit exhaust system.

Features & Highlights

  • Removable spark arrestor (race-ready and trail-ready)
  • Stainless steel head pipe, tail-pipe, and end-cap
  • Easy to repack
  • Lighter than stock
  • Designed for bikes with a big bore kit

Positive Reviews

  • Great, crisp sound
  • Easy to install
  • Improved throttle response

Negative Reviews

  • Requires more upkeep than others (to prevent surface rust)
  • Not cheap

Overall, the Honda CRF50 Pro Circuit exhaust is very well-built, looks great, and sounds good.

View pricing and read reviews about this PC exhaust on RevZilla.com.

FMF CRF50 Exhaust (Powercore 4)

Even though FMF is a company that continues to make some of the best aftermarket exhaust systems on the market, they are still able to offer these at an affordable price.

Full FMF Powercore 4 exhaust system on white background

All-in-all, the FMF Powercore 4 exhaust is one of the best for a stock Honda CRF50.

While these aftermarket pipes may not look as nice as a Yoshimura, they are well-built, look good, sound great, and improve the dirt bike’s performance. If you’re wondering how fast is a 50cc dirt bike, they aren’t too fast… but they are FUN!

Here are a few of the main highlights, as well as the pros and cons of this CRF50 exhaust by FMF:

Features & Highlights

  • Aircraft-grade aluminum canister 
  • Stainless steel head pipe and tailpipe
  • Works well with a wide range of years
  • Easy to repack
  • Designed for stock bikes (without a big bore kit)

Positive Reviews

  • Affordable
  • Great sound
  • Improved throttle-response
  • Good fit
  • Easy to install
  • Don’t need a big bore kit

Negative Reviews

  • A little too loud (for some people)
  • Not great with a big bore kit

If you’re shopping for an aftermarket exhaust system for a CRF50F but you don’t want to break the bank, this is it. FMF knows how to make great exhaust pipes that you can be proud to have.

Click here to view pricing and read reviews on Amazon.

Cheap CRF50 Exhaust Systems

Yes, there are other aftermarket Honda CRF50 exhausts out there.

Here are some of the popular pipes that didn’t quite make the “best-of” list. Most of these are less expensive than the top three mentioned, but really they are all still good CRF50 exhaust systems… the last one being the least impressive of the list.

  • BBR D3
    • Very nice! Lightweight, good quality, good sound
  • Big Gun Evo
    • On the cheaper side, sounds better than stock, improved throttle response
  • Bill’s Pipes RE 13
    • Quality pipe, great sound, improved response and power throughout
  • Two Brothers M6
    • Cheap exhaust for CRF50 (cheap price, decent build), sounds killer (but loud)
  • Piranha T4
    • Cheap exhaust, better sound than stock, kinda’ meh, but okay

Stock CRF50 Exhaust Mod

Of course, bolting a new exhaust on your dirt bike would be ideal, but not necessarily the best “bang for your buck” when it comes to performance.

Since most of us lean towards putting on a CRF50 aftermarket exhaust to make them sound (and look) better, getting one is fine. But if you’re looking for the cheapest way to make your CRF50 sound better, you can also pick up a cheap little “power tip” that you can put on your stock exhaust muffler.

Optional stock exhaust pipe modification

And another thing cool about it… it fits all years for the following mini Honda dirt bikes, including the older (no longer produced) models like this Honda 100cc dirt bike, whether it’s a CRF or an XR. Here’s the list of dirt bikes this fits on:

  • CRF50 
  • CRF70 
  • CRF80 
  • CRF100 
  • CRF110 
  • XR50 
  • XR70 
  • XR80
  • XR100

Click here to view pricing and read reviews on Amazon.

CRF50 Jetting for Aftermarket Exhaust

Do you have to re-jet your CRF50 after a new pipe? Simple answer. Maybe.

Okay, so maybe not the most cut-and-dry. Some find that they need to re-jet, while others don’t. Chances are that you will be able to squeeze a little more performance out of your little Honda 50cc if you do re-jet it, but not guaranteed.

If you’re going to re-jet your CRF50 it’s going to take a little trial-and-error, but it shouldn’t be too big of a deal.

In order to properly jet your CRF50, you should make small, gradual adjustments and test in between every-single adjustment. First, you need to evaluate how the dirt bike is running and whether it does need to be re-jetted or not.

  • Is it running a little rich?
  • Is it running a little lean?

After you’ve identified whether it’s running rich or lean (see below) you can make adjustments as needed.

For example, if you notice your bike is running a little lean after adding a new pipe, simply adjust the jetting one setting richer at a time. Do this until your bike reaches its peak performance.

Basically, you’re going to want to buy a few different-sized pilot jets (larger than stock). The Honda CRF50 dirt bikes are often jetted a bit too lean (for emissions) in the first place.

Do you need to change jetting on your CRF 50?

Before you start “messing” with the jetting, here are a few symptoms to look out for:

  • Poor throttle response (especially if after a new exhaust)
  • Idling high
  • Loss of power
  • Sputtering easily
  • Fouled spark plug
  • Overheats easily
  • Hard to start
  • Bogging down

How to know if jetting is too rich?

Assuming that you are experiencing some issues with your dirt bike’s jetting (see above), you’ll next want to narrow it down to running too rich, or too lean. Here are a few symptoms to look for from a dirt bike that is running too rich:

  • Poor response on the top-end
  • Poor throttle response
  • Hard to start when hot
  • Fouled spark plug (or fouls often)
  • Sputters or hesitates at high RPMs
  • Loss of power

How to know if jetting is too lean?

Okay, and now time for the opposite issue. If you’re CRF50 is running too lean, here a few of the common symptoms to look for:

  • Hard to start when cold
  • Idles high
  • Bogs down when trying to “snap” the throttle
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