FMF Gold Series Pipe, "Fatty Moto"

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FMF Gold Series Pipe, "Fatty Moto"
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FMF Gold Series Pipe, "Fatty Moto"

Our Price: $197.99$251.99

MSRP: $219.99 - $279.99 - You save up to $28.00 (10% off)

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Additional Videos

FMF Factory | Inside Look

How to - 2 Stroke Pipe Install

RM YouTube Channel

Details

    FMF's Gold Series Fatty Moto is one of their most popular pipes because it provides a smooth power band, increases in power all along the curve, and better control regardless of where you are in the power band.

    Unusable peaks in power will be leveled out and more power in the lows and mids will be added. The top end doesn't suffer since all the original punch is maintained along with more over-rev. That means more fun all around no matter the type of riding you like.

    Why? Because with more usable power you get a better hook up during acceleration and more control while you ride aggressively on dicey terrain.

    And with FMF using their Tru-Flo stamping process and signature nickel plated finish, contours are consistent and corrosion is kept at bay throughout the header pipe's steel body.

    Specs:
  • Improved power throughout band
  • Increased over-rev
  • Smooth power delivery
  • Carbon steel body with nickel plating prevents corrosion
  • Tru-Flo stamping process ensures proper contours and fitment
  • Most models include new O-rings
  • Made 100% in the USA
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

FMF Gold Series Pipe, "Fatty Moto" Reviews

Each review submitted enters you into a
$100 gift card monthly drawing and a
$500 gift card quarterly drawing!
 
4.8 / 5.0
175 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
153
18
3
0
1
Value
4.7 / 5
Durability
4.8 / 5
Ease of Installation
4.9 / 5
Fitment
4.8 / 5
Performance
4.9 / 5
Finish
4.8 / 5
Features
4.7 / 5
Recommend it?
Yes (54)
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
3 / 5
Performance
5 / 5
Finish
4 / 5
Features
5 / 5
Recommend it?
Yes
Sounds great!
Sounds great, and I’m working out some jetting issues. Although, the fit is not great. There is about an inch of space at the lower frame connection. It is the correct year, bike, etc. also, there were a few dents on it, and not the fitment dents for the radiator, etc.. overall it’s a great pipe.
-m-2003 KAWASAKI KX125--
November 7, 2018
Las Vegas, NV, US
Age: 45-64
Purchased
3 weeks ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Recommend it?
Yes
The install of the pipe was perfect fit and performance add was significant broadening the power range increasing low end power and taking nothing away from top end

-m-2006 KTM 65 SX--
November 5, 2018
St.peters , MO, US
Purchased
3 weeks ago
Value
5 / 5
Durability
5 / 5
Ease of Installation
4 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
GREAT pipe
You cannot go wrong with an FMF pipe for any motorcycle application. This one for sure gave my 2003 CR125 more bottom end power. One thing to remember is that this pipe did not come to my door with hardware and rubber gromets, so be ready to pull the old ones off of your stock pipe. Other than the pipe not coming with gromets and hardware, i highly recommend all FMF products.

-m-2003 HONDA CR125R--
October 31, 2018
Port Angeles, WA, US
Age: 15-24
Purchased
4 months ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
6'1 - 6'3
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
-m-2019 YAMAHA YZ125-- it made a big difference in the power of the bike. My son was son impressed.
October 10, 2018
Las Vegas , NV, US
Age: 15-24
Purchased
1 month ago
Gender:
Male
Weight:
101 - 130 lbs.
Height:
5'7 - 5'9
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Flawless process.
Great pipe, great sound. Would definitely buy again from Rocky Mountain. Thanks
August 10, 2018
Southington, Ct, UM
Purchased
3 months ago
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
MUST buy
Great pipe makes my bike sound great compared to stock and it also makes the bike look great MUST buy

-m-2018 YAMAHA YZ125--
My beautiful 2018 yamaha yz125 that I'm building now only if rocky mountain a tv would sponsor me ??
My beautiful 2018 yamaha yz125 that I'm building now only if rocky mountain a tv would sponsor me ??
August 3, 2018
East worcester, NY, US
Age: 15-24
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'7 - 5'9
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Great part, great sound, easy installation
Pipe went on easy, sounds great! and power was increased. I’ve been on three rides with the new pipe so far and I couldnt be happier with the purchase. Only thing i would recommend is getting a new rubber gasket for the connection between the muffler and expansion chamber. I have a 2015 KTM 250 SX and the stock rubber connector was letting a small amount of smoke out. Easy fix though.

-m-2015 KTM 250 SX--
July 9, 2018
Coatesville, PA, US
Age: 15-24
Purchased
4 months ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Fmf is always good
Really good power characteristics and on my 17 300xc it is more compact than stock
July 8, 2018
Windsor , NY, US
Age: 25-44
Purchased
6 months ago
Gender:
Male
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Excellent
I had the gnarly before, no gain over the stock pipe. But, with the Fatty the throttle is a little more crisp. You can also tell in the mid to top (which it is designed for)

-m-1998 HONDA CR500R--
June 25, 2018
Idaho Falls, ID, US
Age: 25-44
Purchased
over 3 years ago
Gender:
Male
Weight:
161 - 190 lbs.
Height:
5'10 - 6'0
Value
5 / 5
Durability
5 / 5
Ease of Installation
5 / 5
Fitment
5 / 5
Performance
5 / 5
Finish
5 / 5
Features
5 / 5
Recommend it?
Yes
Smoking pipe
Replaced old PC pipe on my cr125. Looks great.

-m-1997 HONDA CR125R--
97 CR
97 CR
June 14, 2018
North Phoenix, AZ, US
Age: 45-64
Purchased
6 months ago
Gender:
Male
Weight:
191 - 220 lbs.
Height:
5'10 - 6'0
Each question or answer submitted enters you into a:
$100 gift card monthly drawing and a
$500 gift card quarterly drawing!
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 13 questions Browse 13 questions and 50 answers
Is the best exuast for the 2016 kx85 the fatty pipe along with the shorty silencer ?
A shopper on Sep 1, 2016
BEST ANSWER: Regarding KX85 Fatty (yes, I would recommend the more general Fatty over the Narley). However this also depends on your riding environment (woods or MX and overall needs). If you want more top end (Speed) then consider other, but for general broad improvement mostly bottom to mid range the Fatty is golden, without compromising additional weight. If you want additional durability & slightly more weight than the thicker metal Narley is a comparable solution to the Fatty. Shorty sliencer is icing on the top. Sweet combination!
Dose it come with springs and o rings???
tomi v on Feb 14, 2017
BEST ANSWER: Does not come with springs and I cannot remember if it comes with new orings but I would order them just to be safe. Definitely no springs were included.
Does this come with new springs and o rings?
A shopper on Feb 9, 2017
BEST ANSWER: I'm pretty sure the pipe came with a new o-ring but the springs were not included. If you call customer service they are awesome to answer any questions. If anything doesn't work they'll make it right. Best company I've ever dealt with for parts. The local shops can't get your parts as quick.
Does it fit a Kawasaki because Kawasaki pipes are on the left?
ryan T on Oct 18, 2018
BEST ANSWER: I’m not completely sure about one, but when I bought mine it fit like a glove. But it was for a Yamaha
Does this exhaust pipe have the exhaust tip on it or include it?
Payton R on Feb 26, 2018
BEST ANSWER: This doesn't include the silencer. There are several that FMF makes to specify to your power needs. If your looking for overall power increase, this is a good pipe.
im looking for a pipe with the best top end. which do you perfer? i run a cr250r on a racing flat track kart. completely different than how it runs on a bike. thanks!
A shopper on Aug 8, 2017
BEST ANSWER: I bought this pipe for a 2013 xc KTM. I had a black pro circuit that came from a racer friend. If you can find a pro C I would try that for the top end. I know apples and oranges but it was a world of difference for me.
how many powerbands will this add?
cody l on Nov 24, 2017
BEST ANSWER: It fatty takes the top end powerband away and seems too concentrated in the mid and lower area of the powerband.
I have a 2003 YZ85 with a FMF fatty head pipe and a FMF shorty silencer. It is running like its starving for more fuel. It has not been jetted since we put the pipes on it. What size jets do I need to put on the bike to make it run right? Please help asap my daughter is driving me nuts and she has a race this weekend!!! Thank you!
Lynn B on Oct 12, 2018
BEST ANSWER: Pop the bottom of the carburetor off the bike and put a larger jet ie a larger hole and larger jet number to give it more gas. Also make sure your running at least 40:1 gas ratio. Use Maxima 927 or Maxima K2 2 cycle oil for better results. Make sure your air filter is clean with a light coat of oil.
What would be a good exhaust system for a 1999 rm 125 for woods?
A shopper on Jun 26, 2018
BEST ANSWER: A fatty moto pipe is more for a mid to top end powerband as well as a thinner steel. A gnarly pipe is a better woods pipe if your need better bottom. End power. I've used both pipes and that had been my experience.
Does this pipe come rusted sometimes?
Jake m on Sep 10, 2018
BEST ANSWER: The inside will have some rust from manufacturing on most of these.
Hello this fits a 1991 Suzuki rm 80 will it fit a 1991 Suzuki rm 250?
hayden h on Apr 30, 2018
BEST ANSWER: Unfortunately, this will not fit. The pipe is different in between the the RM250 and the RM80.
Will this pipe fit a 1990 Honda cr125r 2 stroke?
Payton R on Feb 26, 2018
BEST ANSWER: To see if this part will fit your machine please enter the make, model, and year into our "Choose a vehicle" drop down boxes found above the product image. If your machine is not listed, we may not carry the right item for your application. If you have a 2018 year model but don't see your machine as an option, please contact a tech via Live Chat or call us at 1-800-336-5437 for assistance.
What is with the FMF Gold Series Pipe, "Fatty Moto"
Fits: 2006 YAMAHA YZ125
Part# 1087090099?

There is nothing on FMF website that refers to it as "FMF Gold Series Pipe, "Fatty Moto". Why can't we see the mfr part # to match and know what we are buying?
Derek C on Mar 9, 2017
BEST ANSWER: Their manufacturer part number is 024049. On their website it is just called Fatty under the two stroke pipes.
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