FMF Fatty Pipe - 2-Stroke

$219.99 - $379.99
$161.77 - $341.99
4.80 5 79
4.80 out of 5 stars
Fitment Expert:
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FMF Fatty Pipe - 2-Stroke
FMF Fatty Pipe - 2-Stroke
  • Description
  • Reviews (79)
  • Q&A (67)
  • Fitment

With well over 35 years of racing experience behind it, the Fatty pipe delivers race-proven performance. The Fatty broadens and smoothes out the power curve while boosting gains throughout the entire power band, more low-end, more mid, and increased over-rev. No matter what type of riding you do, the Fatty has the benefits you're looking for.

  • More tractable power, improved throttle control.
  • Provides power gains throughout entire power band.
  • Carbon steel with a nickel-plated finish for maximum durability.
  • FMF Racing's Tru-Flo stamping process ensures a perfect fit and optimum performance.
  • Can be used with FMF or stock silencer.
  • FMF's most popular 2-stroke pipe.
  • Note: Pipe may include factory indentations for proper installation clearance.

Note: For closed course competition use ONLY. Not intended for street use.

4.8 out of 5 stars (79)
4.8 out of 5 stars
5 star   72
4 star   11
3 star 0
2 star   1
1 star   1
See Terms and Conditions
1-10 of 79
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 500 Contributor Top 250 Contributor
Location: Lake Wylie, SC, USA
simonmx33
AMAZING PIPE!!

ive had this pipe for a while now, and ill tell you, this thing rocks! ive been in multiple bad crashes and not a ding on the pipe, it deffinitely freed up some power both mid and top rpm. the sound is remarkable. of course my bike is tuned and may sound different than any 125sx, but i guess itll give you a taste of how crisp it sounds, paired with the shorty, it sounds good. and ill include an attachment of the sound,

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: St Johns, FL 32259, USA
Iguanajoes
Second time is a charm

I was very pleased with the last fatty but had to replace when I found hairline cracks from wear over time. This one was a slightly different shape but fit after adjusting rubber mounts.

Sounds great, runs strong. I would suggest paying close attention to the bend in the pipe behind the front wheel. Keep it clean and dry to avoid premature failure.

Overall 4 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Panama
MOTONIKO11
ATC250R 1986

THE BEST IN THE MARKET,HAVE 20 YEARS AND LOOKS LIKE A NEW ONE.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
mike
Its like a new bike!

Best pipe on the market with most overall power gain and great top end power. Its like a new bike!

FMF Fatty Pipe - 2-Stroke
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Nixa, MO 65714, USA
Dteracing
Great pipe

Great pipe love were the power kicks in much wider range than my old gnarly

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
ktmrider
GREAT HEADER

I recommend this header to anyone and everyone this is overall the best header around although it is kind of easy to dent but besides that I give it 5 stars

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Pismo
Mallett
FMF Fatty - 2013 KTM 150XC

Took a few tries on jetting, had to lean up PJ, go to richer Needle and MJ.
Final jetting = 40 PJ, NOZH Needle and 178 MJ. Better bottom, much better mid and even better top end and over-rev.

Liked it so much on the 150XC, bought one for the 150SX as well. The 150 XC/SX is a great motor made even better, more usable and forgiving on tight technical or aggressive track riding.

2013 150XC w/ Fatty and Turbine Core
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
wishihadone
Wish everything was this easy

The pipe was an excellent fit and went on with ease, no tweaking or adjustment needed. Engine does seem to breath a little better now. I got no real complaints about the pipe but it would be nice if it was available in black, just seems to be a shame to scratch up such a nice finish. I still need to do a little fine tuning with the carb but it seems to perform as advertised. No complaints here. I cant say anything about durability yet as it hasn't served as the impact point,,,, yet.....(fingers crossed..) but I did invest in an aluminum pipe guard to help protect the investment.

FMF Fatty Pipe - 2-Stroke
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: New York, NY, USA
kdubb
Great Pipe and sounds amazing.

put this pipe on my cr125 sounded great and gave it more power but i crash my bike on the side where the pipe is located and it had a bit of a dent. But this pipe shines like no other.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Pennsylvania, USA
none
Chris

I have seven bikes ,two have Gnarly pipes, one has has SST,the rest have Fattys,FMF makes the best pipes

1-10 of 79
Total Questions (67)
Questions with answers:
  67
Questions without answers:
0
GoinForARipAreYaBud
Rm25091 Location: Norway
Jack Location: New Zealand
1-10 of 67
GoinForARipAreYaBud 17 days ago
Will it fit with a pro circuit exhaust?
I have a factory pro circuit silencer on my 2001 yz 125 i want to know if it will fit together
Expert MotoSport Staff
16 days ago
MotoSportExpert
Yes the PC silencer should fit with the FMF pipe on your YZ125 with no issues.
beezee 3 months 21 days ago Location: arbroath scotland
Would this fmf fatty fit my yz80 1988?
And have yous got anymore parts that would fit aswell
MotoSport Staff Expert
3 months 20 days ago
MotoSportExpert
Yes. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct pipe for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Rm25091 4 months 24 days ago Location: Norway
Will the FMF Fatty pipe fit Suzuki rm 250 1991?
I need both exhausts for my rm 250 1991 model. Will it fit?
Expert MotoSport Staff
4 months 23 days ago
MotoSportExpert
Yes it Fits your 1991 Suzuki RM250. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct pipe for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Razb 4 months 27 days ago
Will this pipe fit the husaberg te 125 2012 ? This bike wasn't shown on your bike list?
MotoSport Staff Expert
4 months 23 days ago
MotoSportExpert
Sorry FMF does not offer a pipe for your 2012 husaberg te 125.
JEB79 4 months 29 days ago Location: WV
Silencer?
I had purchased the factory FMF Fatty pipe 2-stroke with a power core 2 silencer for a 1999 YZ250. I now have a 2001 YZ250 would the pipe and silencer I purchased for the 1999 work on the 2001? If not, would the silencer from the '99 bundle work with this pipe for the 2001 model? Thank you.
Expert MotoSport Staff
4 months 28 days ago
MotoSportExpert
The FMF FMF Fatty Pipe (024053) would be the same on the YZ250 from 99-2015. The silencer however would not be the same. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Jack Over 6 months ago Location: New Zealand
Would a cr250 pipe fit a crm250?
1993
MotoSport Staff Expert
Over 6 months ago
MotoSportExpert
All products sold on MotoSport.com are for US models only. We unfortunately do not have product fitment for non-us models. Also any street legal products are designed for US emissions and laws.
zippy Over 6 months ago Location: Surrey, BC, Canada
Will this fit 2005 polaris predator 90?
Expert MotoSport Staff
Over 6 months ago
MotoSportExpert
Yes the FMF Fatty Pipe Fits your 2005 Polaris PREDATOR 90. Just be sure to correctly select the Year/Make/Model of your ATV before ordering so we can be sure to send you the correct pipe for your ATV. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Jrod Over 6 months ago
What is the fmf part number for this product for the 1995 Honda cr125?
What is all included with the pipe?
MotoSport Staff Expert
Over 6 months ago
MotoSportExpert
For your 1995 Honda CR125 the FMF Fatty Pipe would be FMF part number 020015.
*Pipe only
Magoo Over 6 months ago Location: Michigan
Pipe change because of power robbed from powercore2?
I put a powercore2 spark arrester ( required by state forest ) on my KX 125 and it severely robbed power, I was debating on modifying a Kdx 200 expansion chamber and putting it on my bike (because it has a big bore kit) to regain bottom end power after rejetting it.
Expert MotoSport Staff
Over 6 months ago
MotoSportExpert
I would first make sure your KX125 is properly jetted and has a fresh top end. Depending on what type of riding you are doing I would check the gearing and adjust accordingly, you may want to go up or down on the gearing to get more top or bottom end power. There are many factors that go into properly tuning a 125. Modifying a KDX200 pipe would probably not be the best or easiest way to go. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
starky Over 7 months ago
I have a 2002 Polaris Scrambler, will this fit a 4x4 or just a 2x2?
MotoSport Staff Expert
Over 6 months ago
MotoSportExpert
This FMF Fatty Pipe would be for the 2002 Polaris Scrambler 400 2x4.
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