FMF Fatty Pipe – Review


The FMF Fatty Pipe For 2-Strokes is the most copied 2-stroke dirt bike pipe in the world, so you know that FMF makes a guaranteed quality pipe. I like making my dirt bikes go faster, and a pipe is a simple bolt-on that can do that. The FMF Fatty exhaust is the first one that came up because it’s the most popular, so I figured it must be worth it..

Your 2-Stroke Will Have A Power-Band!

Not that it didn’t have one before, because there are people out there that truly don’t know that a power-band is not an actual “part” on a dirt bike (more on that in a future article). The Fatty pipe was built to not only increase the power-band on your 2-stroke, but to increase power across the entire RPM range as well. This makes for a great addition if you do a variety of riding types (motocross, trails, play-riding).

Hold Onto Your Panties

When your dirt bike is jetted correctly, you will instantly notice better throttle response at idle and across the rev-range, so you’d better hold on (but not too tight or you’ll get arm-pump!).


You Get To Control The Snap of Your 2-Stroke

Two-stroke motocross bike are snappy when on the pipe. More so a 125, because almost all of the power is up top, leaving nothing down low. This makes them more difficult to ride for people that aren’t used to them. Don’t worry though, FMF someone manage to get more power out of your two-stroke, while making it easier to ride with a more linear power-band. It will still hit hard, but the power is spread out so the bike isn’t so peaky.

Rev That Sucker To The Moon

So far you have more power with the fatty, better throttle response, and a smoother power-band that makes it easier to ride… What more can you ask for? Oh yeah, more over-rev. Stock pipes often “sign-off” early, causing you to shift more to keep it in the meat of the power. Well the Fatty pipe continues to rev even further than stock without the power dropping too dramatically.

It’s Pretty Much Plated With Gold

If you have used a stock pipe on your two-stroke then you probably know how easily they get dents in them. FMF uses a lower gage metal, meaning thicker, so it withstands a lot more abuse before denting up.

Classic FMF

And to top it all off, FMF gives this exhaust pipe their “Tru-Flo” stamping process to guarantee that it will fit, look, and perform great. Really, this is the do-it-all two-stroke pipe. Four-stroke exhaust pipes cost an arm and a leg, but with the Fatty you get high-quality performance at a great price.

What Are Others Saying About The FMF Fatty Exhaust Pipe?

The FMF Fatty has received dozens of enthusiastic reviews from almost every buyer. It has an average of 4.8 out of 5 star rating on MotoSport; the best selling pipe.

Some of the consumer comments:

  • Unbeatable Performance
  • Great 2 stroke pipe
  • Awesome pipe on my CR!
  • Good buy

Buy My FMF Fatty Pipe

-Tom Stark

P.S. Check out my other review for the FMF SST Pipe

’01 Yamaha YZ125 With FMF Fatty Pipe

FMF SST Pipe Review

Looking for some bolt-on power for your two-stroke? I tested the FMF Gold Series SST Pipe on a 2003 Yamaha yz125 and it is a great pipe for riders who want smooth and more power. The power-band got a healthy increase of horsepower and was broadened; resulting in less of a ‘hit’. The bottom-end power was close to the same as stock with the SST, and the mid-range was slightly better than stock. This FMF pipe makes the bike easier to ride because it’s not as snappy, and the throttle response was spot on and hit right off of idle. The FMF SST pipe also gave my bike a lot more over-rev compared to stock. That was probably the biggest change I felt because the power just dropped at really high RPM with the stock pipe, but the FMF SST pipe kept the bike pulling for much longer. I really liked that because I ride in the high RPM range.

Overall it’s a really good horsepower addition and makes it easier to ride if you stay in the mid-range and and top-end because that’s where there is more power, plus the over-rev adds additional gains that can greatly help faster riders. But for beginners or riders who like to lug the bike around more, it’s better to stay with a stock pipe or an FMF Fatty. The FMF SST is made of high-quality Steel which is stronger and more durable than the stock exhaust pipe. The SST is also chrome plated, which gives it a great shiny look that lasts long. Thanks for reading this, and I will have more reviews to come!

Buy My FMF SST Exhaust

-Tom Stark

P.S. Check out my other review for the FMF Fatty Pipe if you haven’t already

’03 Yamaha YZ125 With FMF SST Pipe