FMF Factory Fatty Pipe

FMF Factory Fatty Pipe
FMF Factory Fatty Pipe

$206.99 - $224.99
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Description See Also: 14 Reviews 19 Questions Fitment
Item #FMF00E4

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14 Reviews
4.9 out of 5 stars
5 Star   18 4 Star   2 3 Star   0 2 Star   0 1 Star   0
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All Reviews
2smoker Verified Purchaser
Virginia
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 4/5
Bottom end boost

Made a noticeable bottom end power increase, pleased with the performance and would recommend this product.

On the appearance side it could be better. The welds aren't very good and they never got touched up or finished so the welds are already rrusted. There was also a very minor dent but I am more concerned with performance not appearance. Overall good product.

Rowdy Top 250 Contributor Verified Purchaser
Florida
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Fmf pipe

Easy to install with awesome performance and no jetting change

FMF Factory Fatty Pipe
Ray13 Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

Amazing exhaust. Easy to install

FMF Factory Fatty Pipe
Rowdy155 Verified Purchaser
Florida, USA
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Fmf pipe

Bought this pipe as a up grade over the stock one. Like the increase in power and the sound is nice and it fits well also. Very nice product.

FMF Factory Fatty Pipe
1redrider Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Fatty factory pipe

Bought this for a good friends son. He rides almost all off road, hare scrambles, and enduros and even a GNCC. He was excited!! He said it was a total improvement over stock . Fit and finnish COOL! FMF makes quality stuff!

Curt Verified Purchaser
Central FL
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Upgrade from FMF Fatty

Installed on an 05 RM250 Race Bike that previously had the FMF Fatty and noticed an immediate improved in throttle response, and better top end. Not to mention the sound of the bike is much more crisp. Sounded and performed better than a PC on an identical 05RM250. Also purchased a PowerCore II Titanium silencer to complement the pipe. Bike dropped about three pounds over the old Fatty & Silencer. Be sure to cover pipe in Pam during rides. Post ride; clean then lubricate with WD40 as it is the works finish and will rust.

TheIdahoKid Verified Purchaser
St. Maries, ID 83861, USA
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
2013 50sr FMF pipe

This pipe is so worth the money. 22% HP gain in this bike. 2.5hp and it hits hard. Turn your sr into an sxs with this pipe. They do not do anything different at the factory. Go from an 85 to a 90 main jet and let it rip. Evan is now getting the holeshots on the cobra's

FMF Factory Fatty Pipe
sammy
new zealand
Durability 3/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Excellant purchase

The exhaust made a good power increase throughout the whole rev range only problem is that it is prone to rust unless looked after exceptionally carefully.

Erik
Durability 3/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Power!

added lots of power to my ktm 125. power was more noticable in bottom to mid range pull. Bought with a jd jet kit which helped a ton

DMAC19
Port Orchard, WA, USA
Durability 3/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
2012 yz 125

love the pipe and its almost worth your money but if u put your bike away muddy or dirty the it will rust and it will not come off with wd40.
it wont look the best if u dont wash it after your done riding.

FMF Factory Fatty Pipe
hoohahh Top 500 Contributor
Grand Rapids, MI
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF does it again!!!

I have this pipe on both my 05' CR125 and 07' CR250. For 125's you can expect a healthy increase in midrange pull with a little bit more over rev. Throttle response is also improved slightly if jetted correctly. For a 250 you can expect to see an increase in the bottom through midrange with a little more over rev. Where this pipe stands out is that it delivers a healthy amount of power just about everywhere but in a useable nature. Fit and bolt on is spot on and both pipes were matted with a shorty silencer. I gave the durability a 4 because as with any "works" finish pipe you have to rub it down with wd40 and give it a sos pad scrub once in a while to keep away the rust. Overall great pipe from a company keeping 2 strokes alive.

FMF Factory Fatty Pipe
montanamaniac Verified Purchaser
Helena, Mt
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Toughest pipes

FMF makes a great product. Adds more usable power where needed and is much stonger than stock. I have had a few procircuit pipes on my yz250 and loved the power but the are not near as tough as these.

crf150rracer Top 250 Contributor
I love this

this does exacctly wat it says i just got it for my 2012 ktm125sx it gives a huge power inccrease

BmXKiD
Somewhere, USA
Sounds great

This pipe sounds great and has a lot of power! I plan on buying this for all of my other dirtbikes as well! :)

19 Questions
Answered:   19
Not Yet:   0
Jess
Q: Can I put the pro circuit r304 silencer on this pipe on a kx100?
24 days ago
MotoSportExpert
Expert MotoSport Staff
23 days ago
A: Fitment between manufactures can not be guaranteed. With that said you shouldn't have an issue.
MiniGman
Location: Airway Heights, WA, USA
Q: Pipe fitting into YZ Stock silencer?
Over 10 months ago
I have a 2013 YZ-125 and cant afford the pipe and silencer at the same time and need to do it in stages. If I get the pipe first, will it fit into the stock silencer?
MotoSportExpert
MotoSport Staff Expert
Over 10 months ago
A: You should have no problems running the stock silencer with this pipe on your 2013 Yamaha YZ125.
Jack
Q: Would this fit my dep silencer?
1 year 3 months ago
Would I be able to use this expansion chamber with my dep silencer of would it have to all be fmf?
MotoSportExpert
Expert MotoSport Staff
1 year 3 months ago
A: Most likely it will work but fitment can not be guaranteed with that combo.
Zack
Q: Will the SST,the Factory Fatty, or the Fatty be the one that is easiest to keep clean?
1 year 4 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 4 months ago
A: The nickel-plated finish on the SST and Fatty pipes will be easier to clean and maintain than the bare finish on the factory pipes.
StefanB
Location: Geelong VIC 3220, Australia
Q: What does it increase and decrease?
1 year 5 months ago
I have a 2005 rm250 and im looking for a stronger hit in the powerband and more top end pull would this pipe be the best for me?
MotoSportExpert
Expert MotoSport Staff
1 year 5 months ago
A: Fatty pipes are designed to give the engine an all around power increase. We are not drastically altering the power band of the bike. This pipe will appeal to most people that are happy with the stock power band and just looking for more useable power everywhere. You would probably want to go with the SST. Think of the SST as a mix between the Fatty, and the Rev pipe with a little help from the rear SST section. This pipe gives an all around power increase similar to the Fatty, yet gives it even more mid and top like the Rev without sacrificing low end. This pipe offers a new power band that wasn't available in the past, with its new technologies.
Chestersx
Location: Ga
Q: Ktm jetting?
1 year 5 months ago
What jetting setup could I run on a 2015 Ktm 250 sx at 1,000 -2500 elevation in 80-90 weather. Thanks
MotoSportExpert
MotoSport Staff Expert
1 year 5 months ago
A: There is not a specific setting I could give you for jetting your bike. It would really depend on how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.
kyle
Q: Why wont it work on a yz 125 2004 i really like this pipe but dont understand why its not working.?
1 year 5 months ago
if I have a 04 and this pipe that i like wont fit should i order the 05 one or will it not fit?
MotoSportExpert
Expert MotoSport Staff
1 year 5 months ago
A: Unfortunately FMF does not offer the FMF Factory Fatty Pipe for your 2004 Yamaha YZ125. In 2005 Yamaha switched from the steel frame to the aluminum frame on the YZ125. Because of that the 2005+ pipe will not mount on the 2004.
Bailey
Location: Queensland, Australia
Q: Does this pipe come the same shape and style like the photo if bought for. 2015 ktm 125 and will it fit onto a titanium 2 silencer and how more HP?
1 year 7 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 7 months ago
A: The image is a generic image supplied by the manufacturer for reference only. It may not be displaying the exact part for your bike. 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.
Jake
Q: My friend has this exact pipe on his 2007 Honda CR125, but when I select my 2005 Honda CR125 it says the pipe is not compatible, why is that?
1 year 7 months ago
This is the exact pipe on my friend's 2007 Honda CR125 and I've been wanting to put the same pipe on my 2005 Honda CR125, but it says this pipe will not work with my bike when it clearly will. Why is that?
MotoSportExpert
Expert MotoSport Staff
1 year 7 months ago
A: If the part is available through one of our suppliers, we would be happy to order it for you. Please contact one of our sales professionals to inquire about special orders and availability.

Dirt Bike / ATV: 1-888-676-8853
Sport Motorcycle: 1-866-677-7338
Cruiser: 1-866-333-8033
trey
Location: Albuquerque International Sunport (ABQ), 2200 Sunport Blvd, Albu
Q: Wil this fit on a turbinecore 2? 2008 ktm105sx?
1 year 10 months ago
MotoSportExpert
MotoSport Staff Expert
1 year 10 months ago
A: Yes this FMF Factory Fatty Pipe will work with the FMF Turbinecore 2 on your 2008 KTM 105SX. 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.
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