FMF Fatty Pipe

Item Number: 325826


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Product Description

FMF Racing

FMF Fatty Pipe

With well over 35 years of racing experience behind it, the Fatty Gold Series 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 (unless noted)
  • Their most popular 2-stroke pipe

Spec Details
Country of Origin USA
Finish Nickel Plated
Material Steel

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • ATC250R 1985-1986
  • CR80R 1996-2002
  • CR85R 2003-2007
  • CR125R 1990-2007
  • CR250R 1997-2007
  • TRX250R FourTrax 250R 2x4 1986-1989


  • TE 250 2011-2014
  • TE 300 2011-2014


  • CR125 2003-2006, 2012
  • WR125 2003-2006, 2009-2010, 2012
  • WR150 2011-2012


  • 50 SX 2009-2014
  • 50 SX Junior 2001, 2006-2008
  • 65 SX 2002-2014
  • 65 XC 2008
  • 85 SX 2003-2004
  • 85 SX 17/14 2005-2014
  • 85 SX 19/16 2005-2014
  • 85 XC 2008-2009
  • 105 SX 2007-2012
  • 105 XC 2008-2009
  • 125 SX 2000-2010, 2012-2014
  • 144 SX 2007-2008
  • 150 SX 2009-2014
  • 150 XC 2010-2014
  • 200 SX 2003-2004
  • 250 EXC 2004-2005
  • 250 SX 2004-2014
  • 250 XC 2006-2014
  • 250 XC-W 2006-2014
  • 300 EXC 2004-2005
  • 300 MXC 2004-2005
  • 300 XC 2006-2014
  • 300 XC-W 2006-2014


  • KDX50 2003-2006
  • KDX200 1989-1994
  • KDX250 1991-1994
  • KFX80 2003-2006
  • KX65 2003-2016
  • KX80 1991-2000
  • KX80 Big Wheel 1991-1994
  • KX85 2002-2013
  • KX100 1995-2009, 2011-2013
  • KX125 1990-1991, 1995-2005
  • KX250 1988-1989, 1992-1994, 1997-2007


  • JR50 2000-2006
  • LT80 QuadSport 80 1987-2006
  • LT250R QuadRacer 250 1985-1992
  • LT500R QuadRacer 500 1987-1990
  • RM65 2003-2005
  • RM80 1989-2001
  • RM85 2002-2010, 2012
  • RM100 2003
  • RM125 1997-2007
  • RM250 1989-1990, 1996-2008
  • RMX250 1989-1991


  • PW50 Y-Zinger 1983, 1985-1987, 1990-2009, 2013-2014
  • PW80 Y-Zinger 1991-2006
  • WR200R 1992
  • WR250Z 1991-1997
  • YFS200 Blaster 1988-2006
  • YFZ350 Banshee 1987-2006
  • YZ80 1993-2001
  • YZ85 2002-2014
  • YZ125 1996-2014
  • YZ250 2-Stroke 1984-1986, 1989, 1991-2014
  • YZ490 1984-1990

Customer Reviews

Questions & Answers

  • Is this a left side pipe

    By: Logan k

    All FMF Fatty pipes are a complete header pipe for each particular model and exit the motorcycle on the same side as the stock pipe. If your machine has more than one cylinder, both pipes would be included - one for each side. For example, a Yamaha YFZ350 Banshee would have both pipes included in the kit.

    By: Staff

  • Does the pipe come with gaskets?

    By: tfw2525

    All FMF pipes come equipped with the O-ring gaskets to seal the pipe to the factory exhaust port on the stock cylinder head.

    By: Staff

  • Will this pipe fit a 1996 Yamaha yz125?

    By: Stuart

    Yes it certainly will. Simply choose your machine from the fit menu next to the pipe's image and then add to cart and we'll get you the pipe you need for your machine!

    By: Staff

  • Will this pipe fit a Kawasaki 220 1999?

    By: Guest

    FMF does not make a fatty pipe to fit the 1999 KDX220R. We do have the FMF Gnarly Woods Pipe and FMF Gnarly Desert Pipe that'll fit that machine. You can find both of those pipes in our store.

    By: Staff

  • What type of jetting will I need? My bike is a 2000 kx125. It has a fmf fatty high range pipe on it now

    By: Russ

    While it's impossible to say exactly what jetting will work best with your needs due to factors such as your bike's overall state of tune, where you do most of your riding and the fuel used, a good baseline may be as follows. Keep in mind, these recommendations are for a bike that's running a 32:1 fuel-to-oil mix ratio using a 50/50 mix of race fuel and super-unleaded gasoline and ridden at around sea level.

    Main jet: 160

    Pilot jet: 45

    Fuel needle position: 3rd

    Power jet: stock

    Air screw: 1.5

    Those settings may not be perfect for your needs, but they serve as an excellent starting point to get the most out of your bike. From there, common jetting adjustments will apply to get you truly dialed in for the best possible throttle response and engine power output.

    By: Staff

  • what type of jetting and needle stuff do i need for the pipe

    By: gent

    Without knowing exactly what machine it is that you have, we cannot say for sure what kind of jetting will be required. That said, we do make a wide range of FMF carburetor jet kits that come with everything you need to work with any of FMF exhaust system. In each kit you will find easy-to-understand instructions as well as a range of components to tailor fueling to your machine's exact needs.

    By: Staff

  • Does it come with springs?

    By: Guest

    Most FMF pipes do not include exhaust springs, in which case you are to re-use the OEM springs. Should the FMF pipe's design be significantly different that stock and requires a particular set of springs, they'll be included with the pipe.

    By: Staff

  • I have a Kawasaki KX125. Is the pipe supposed to have 3 dents on the side that faces the bike?

    By: Jared

    Yes, absolutely! It's not at all unusual to see what appear to be dents on a brand new FMF pipe. Many of FMF's pipes have what appear to be dents on the sides that face the bike or in places that are near the radiator, engine or bodywork. The dents are carefully engineered to provide clearance between the pipe and the bike in order to maximum engine performance and throttle response.

    By: Staff

  • Would this fit my 1995 Cr125?

    By: Hondarules

    Yes, FMF does make a Fatty pipe for the 1995 Honda CR125R. With that pipe and a properly jetting CR125R carb, you can expect better punch down low and vastly improved throttle response. Just choose your machine from our fit guide and we'll get you sorted out, no problemo.

    By: Staff