• There is a reason the FMF Fatty pipe is the most copied 2-stroke pipe in the world, quality build and perfected power increase.
  • The FMF Fatty pipe is designed to increase the powerband on your 2-stroke across the entire range, making this pipe ideal for all types of riding.
  • Install the FMF Fatty pipe on your 2-stroke and expect improved throttle response, increased linear powerband and enhanced over-rev for a performance that can only come from the originators of the best pipe on the market.
  • FMF uses their Tru-Flo stamping process on the Fatty pipe to ensure an accurate fit and precision tuning every time.

FMF FATTY PIPE - 2-STROKE

Price Range: $154.99 - $314.99
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Overall:
5 out of 5
5 out of 5
Location: Danese wv
THE BEST EVER
" this pipe is the best pipe ive ever had it gives my bike some serious power and realy sends the power bands into overdive you should totaly get one plus it looks great on my 1999 yz125 "
Overall:
5 out of 5
5 out of 5
Location: Saint Louis, Mo
Easy power!
" Super easy to install. Took about 30 minutes to remove old exhaust and install now one! looks great and gives it a better power range. Also comes with jetting sheet for the bike which takes all the guess work out of it. "
Overall:
5 out of 5
5 out of 5
Location: Friendswood, Tx
Great Buy
" Love the product sounds great awesome performance it just works!!! "
Overall:
5 out of 5
5 out of 5
Location: westerly, RI
great buy
" fit perfect on my yz125 and has a great overall look "
Overall:
5 out of 5
5 out of 5
Location: Not Available
Great pipe
" Makes lots of power. A little snapy for tight woods. But a great all around pipe. Installed on 07 KX 250 2 stroke. "
Overall:
5 out of 5
5 out of 5
Location: Not Available
great pipe
" have it on my 94,98,and 03 cr250 and i can definately tell it helps beef up the power, cant really tell with durability cause i have a pipe guard but it seems pretty solid to me, probably the only pipe i will ever buy "
Overall:
5 out of 5
5 out of 5
Location: Eugene, OR
Awsome Buy !
" I bought this FMF FATTY PIPE for my YZ85 and it made a great improvment on my bike. I Highly recommend buying. Thanks Motosport! "
Overall:
5 out of 5
5 out of 5
Location: brewster,ohio
best bolt on ever
" I purchased a fmf fatty exhaust, it bolted up very easily,it also came with exaust gasket and recomadations for jetting.WOW ,what a it difference. Now it snaps at low rpms and more power at low and midrange,it was unbelevible,also revs out further on top end. they suggested a 450 main from a 460 main and move to 2nd needle position from 3rd,jetting was great.runs very clean,thank you motosport. "
Overall:
5 out of 5
5 out of 5
Location: Bismarck, ND
Unbeatable Performance
" FMF pipes have never failed me, they are by far the best pipe out there for a 2 stroke. Powerful, Great throttle response, huge difference from stock. Not only does it outperform others but looks great on the bike. "
Overall:
4 out of 5
4 out of 5
Location: Seattle, WA
Classic FMF
" Much stronger than the Gold Series it is replacing. There was a little bit bending they did to the pieces to get them welded together on the inside curve, and the finish is not as good in that spot, but has overall excellent construction. Nice and thick walled woods pipe. "
Overall:
5 out of 5
5 out of 5
Location: Carterville, IL
Best pipe
" i put this on my yz125 and it def increased the power band and overall power great buy definately recommend buying this pipe "
Overall:
5 out of 5
5 out of 5
Location: San Clemente, CA
Great Pipe
" Really good quality and finish. I used the turbine core 2 and it sounds good. "
Overall:
5 out of 5
5 out of 5
Location: San Tan Valley, AZ
Fatty Power
" the FMf Fatty pipe is the best pipe on the Market. Started with a stock pipe and got a Gnarly, added some power to the bottom end and thats about it. then went and bought a Fatty. Fatty gives just as much power as a gnarly in the bottom end but tons more in the top end. Instant power increase. Have paired with the powercore 2, turbine core, and the shorty. All are good partners in crime with the fatty but the power core 2 stood out as the most powerful addition to the fatty. Sick looking, bolt on power, the fatty is the way to go. "
Overall:
4 out of 5
4 out of 5
Location: Not Available
nice pipe
" works good helps for tight woods on my 01cr250r have it w/ a turbinecore2 cuz i need a legal arrestor they work well together "
Overall:
5 out of 5
5 out of 5
Location: sUpErIoR-AZ
Great 2 stroke pipe
" This Fatty pipe gave my 02 CR250r the power increase that i was looking for out in the aRiZoNa desert. Along with the shorty silencer this is a combo that you wont regret!! "
Overall:
5 out of 5
5 out of 5
Location: Not Available
Awasome
" This pipe is awasome! i put it on my yz125 and much much more bottom and top! i love it!!!!!!!! "
Overall:
5 out of 5
5 out of 5
Location: Not Available
very nice fatty
" i got ths for my rm125 i defenetly noticed tha power gain really sick pipe. "
Overall:
4 out of 5
4 out of 5
Location: uniontown,PA
great pipe
" this pipe with the fmf shorty silencer on my rm 125 really helped the bottom and mid range power alot,befor i couldn't lug down low at all now it has a great amount of bottom end to get around burms and get up to speed.i was hoping for a little more of a diff but not bad at all definently worth the money. "
Overall:
5 out of 5
5 out of 5
Location: Klamath Falls Or
FMF Fatty CR250
" As advertised big top end pull. Less bottom end than stock pipe. Not a perfect match for trail riding in my opinion. If you're looking for flat out dunes or desert style riding you can't go wrong here. It's a screamer! A good set up with V force 3 reeds and Turbine Core 2 silencer. "
Overall:
4 out of 5
4 out of 5
Location: Boston, MA
Awsome pipe on my CR!
" I recently put this pipe on my 03 Cr125 and it looks awsome. Makes your bike a little louder and just sounds amazing. Only problem was that the pipe had a big dent in it but i chose not to return it because you couldnt see the dent once on the bike "
Overall:
5 out of 5
5 out of 5
Location: Not Available
good buy
" does it's job but doesn;t mount up on the frame well "
Overall:
5 out of 5
5 out of 5
Location: Kauai,HI
fmf fatty
" i recently bought this pipe for a 02 cr250 it is a great all around pipe i comboed it with a fmf q stealth iit has all around power and yet is super quiet GREAT product. Trails or track great pipe "
Overall:
5 out of 5
5 out of 5
Location: Boston, MA
GREAT PRODUCT!!!!!!!!!!!!
" I BOUGHT THIS PRODUCT FOR MY KX100 AND I FELT A HUGE DIFFERENCE IN THE TOP AND BOTTOM END GREAT PRODUCT "
Overall:
5 out of 5
5 out of 5
Location: Bath, OH
Great pipe
" This is a great pipe, I had it on my cr125 and I could feel a big difference between the stock pipe and the FMF Fatty pipe. Great Pipe "
Overall:
5 out of 5
5 out of 5
Location: Long Island, NY
best pipe ever
" i put this pipe on my cr80 and it made it a screamer!!! and thats what i ove about 2-strokes! i smoke my friend who rides a kxf250 easy! with the powercore 2 you make your bike un-beatable! i ride everything from tracks to trails and no matter what this pipe puts up! and kicks me up! best bike for an 80 "
Overall:
4 out of 5
4 out of 5
Location: Knoxville, TN
OPENS IT RIGHT UP
" The pipe opened my YZ 250 right up. It gave the response I was looking for. "
Overall:
5 out of 5
5 out of 5
Location: Richland, Wa.
Best pipe ever!
" I have this pipe on my KTM 85sx, and its AWESOME! It def did boost the powerband. It also looks great, it blinds anyone you come near, and its very strong! Very easy installation. This is seriously the best pipe I have ever put on one of my bikes! I highly recommend this product! "
Overall:
5 out of 5
5 out of 5
Location: Port Ewen, NY
Sweet Pipe & Silencer
" Hooked this bad boy up to my 1999 CR 250 and it really boosted the powerband throughout. Fit Perfect and looks great. I would recomend for sure. "
Overall:
5 out of 5
5 out of 5
Location: Meridian, ID
Siick
" deffently feel the difference with this pipe in 2-4th gear, gets ride of alot of the pause, and with Vforce3 reed valves an this pipe the 03 yz125 "what i got" seems to be really effective, rairly will a 250F keep up around 2-4th gear. Note: i do have other items "carbon fiber parts" but only real performance parts i have is the fmf fatty and Vforce3 reedvalves "i do run my bike high octaine also" "
Overall:
5 out of 5
5 out of 5
Location: vermilion, oh
Worth the cash
" This pipe is great, you can really feel the difference between stock and this when your pulling out of those tough corners. "
Overall:
5 out of 5
5 out of 5
Location: Clearlake, CA
fatty power
" definitley worth the $ packs power throughout the powerband and looks killer clean "
Overall:
4 out of 5
4 out of 5
Location: Not Available
improved bottom and mid
" I think on the yz250 this pipe makes way more bottom and mid power than stock.Makes the bike super fast in the tight stuff and I can holeshot 450's.Fit n finish was ok,but not great. "
Overall:
4 out of 5
4 out of 5
Location: Hutchinson, KS
Fatty all the way
" This pipe did make a difference in power. It makes my bike look awesome, and it sound great. But there was a miss alignment with the brackets. one of them does not even match up. "
Overall:
5 out of 5
5 out of 5
Location: Clovis, CA
The best
" Can't beat this pipe, for my yz250 just love it. and it looks great on my bike. "
Overall:
5 out of 5
5 out of 5
Location: CHICO, CA
FMF FATTY
" ABSOLUTE THE BEST PIPE I HAVE EVER PURCHASED AWESOME POWER ALL OVER THE BOARD! "
Overall:
5 out of 5
5 out of 5
Location: lakeland, florida
best pipe ever
" i have this pipe for my bike a honda 85 and love it, it feels like i get soo0oooooo much more rpm out of it i absolutely love this fmf pipe "
Overall:
5 out of 5
5 out of 5
Location: Louisville, OH
FMF Fatty Pipe
" I have used this pipe and it is great if you want to port and polish your bike. I would recomend this pipe to anyone it is a great pipe "
Overall:
5 out of 5
5 out of 5
Location: Denver, CO
Fatty Pipe
" AMAZING PIPE! It looks great and it out performs every other pipe out there. I got one for my yz 125 and it helped out the powerband a lot. Great Pipe!!! "
Overall:
5 out of 5
5 out of 5
Location: carmel, NY
beautiful pipe
" i bought this pipe for my yz125 and it smooths out the powerband. it looks great and gave it a deeper tone. its a great pipe! "
Overall:
5 out of 5
5 out of 5
Location: Darien, CT
GREAT PIPE
" I bought this with a Pro Circut Silencer Combo. Max output with minimal sound out of a 2 stroke. Great exhaust! "
Overall:
5 out of 5
5 out of 5
Location: pennsylvania
fmf fatty
" i have a cr125r, and was a little concerned that adding more to the bike would cause a spike in power, and then shorten its life. however, i am happy to report that i have an increase in power and my bike is still very much alive. it was a great buy! "
Overall:
5 out of 5
5 out of 5
Location: Alturas, CA
Great Pipe
" Great pipe to get, it will make your bike a lot quicker. Also, it looks great! "
Overall:
5 out of 5
5 out of 5
Location: Troutdale, OR
Fat
" I have this pipe on both my CR and KDX and find it a nice replacement for the stock unit. I noticed more low and mid in the powerband and the pipe fit perfectly. Be sure to use some high temp sealant if your model doesn't use O-rings. My only wish would be that some aftermarket companies would offer their products in BLACK... why do they all have to be shiny chrome looking? I'm all for stealth... "
Overall:
5 out of 5
5 out of 5
Location: Kingman,AZ
Good
" I love this pipe we have it on our blasters way better then stock and puts out way more poneys "
Overall:
4 out of 5
4 out of 5
Location: Indian Trail, NC
Large Difference Over Stock
" The day I put this thing on my KTM 125SX, I could tell a huge difference in low end power. I went from not being able to ride in the low end, to being able to jump in the low to mid range. This is a great edition to any of your bikes. "
Overall:
5 out of 5
5 out of 5
Location: Port Angeles, WA
outdoors
" this is not a supercross pipe, not enough lower end, almost all top end! its a screamer yes it is! "
Overall:
4 out of 5
4 out of 5
Location: Springfield,Or
Smoking
" '' I installed the FATTY matched with the SHORTY silencer on my 05 YZ 250. It brought the already sweet motor to life. Mid to top screams. I like the fact it comes with exhaust o-rings and jetting recommendations. BRAAP ! "
Overall:
4 out of 5
4 out of 5
Location: Ellensburg Washington
All top end pipe
" This pipe is not a woods pipe. I run one on my YZ for the dunes and desert. This pipe will make your bike lose itss bottom and then scream on the top end like a Banshee. Its all top end so if you want a dunes pipe this is the one to buy. "
Will I need to rejet
Asked by CR250Dave, Seattle
You will have to rejet. FMF has a great jetting spec sheet on their website. Its a great starting point and reference.
Answered by james718
will it fit a 85L
Asked by rm85
It will fit. The L only has to do with the largeer wheels and swingarm to go witht he rear wheel, the frame and everything else is the same, the pipe will fit on both.
Answered by Thekid
will it be easy to dent?
Asked by BAMF, Richmond MI
If it takes a hard enough hit it could dent just like any other pipe.
Answered by Drewski, Portland, OR
Yes,i had one and i just like stalled it and fell and it folded like a soggy taco.
Answered by yzrider02
do you send woldwide
Asked by zoxs
We only ship within the United States and Puerto Rico.
Answered by james718
can it fit with the r-304 silencer?
Asked by tonyb51
The Fatty pipe was designed to attach to the bike like the OEM one. The Pro Circtuit r304 is designed to attach to the bike the same. with that said, these two will match up and connect together. You might notice a little better power gain/performance matching the same manufactured pipe to its silencer.
Answered by james718
will this pipe fit this silincer
Asked by mcdillon
from the pictures the pipe looks to be a stock pipe with a fmf stick on it bro. if thats the case, look for the green check mark that says fits, and if it dosnt show it, check the discription. also if it happens to be a fmf shorty pipe it will fit perfect. most of the FMF pipes and exhausts fit together nicley, onlyway it really dosnt fit is if you dont have the right bike manufacture with the correct pipe.
Answered by 03yzRider, Meridian, ID
Does the FMF Fatty Pipe come with the Jets?
Asked by sheekley
Jets are not included.
Answered by Drewski, Portland, OR
what is the difference between this pipe and the sst
Asked by logan248
the fatty pipe is an all around pipe. the power increase is from top to bottom. where the sst is concentrates most of the increase on top for higher rev power.
Answered by dirt
will it fit in my stock silencer
Asked by Ryan72894
it probly will, but i highly recommend getting a powercore 2 with it you'll notice so much more kick!
Answered by cr80stanks, Long Island, NY
does it come with o-rings
Asked by gRISIUs12
No O-rings are supplied with this pipe.
Answered by Drewski, Portland, OR
do you have to jet the carb? and what would happen if you didnt jet it??
Asked by rmrider2011
You will more than likely have to rejet, if that's something you're not comfortable doing, take it into your local shop and have them install it. Not correctly jetting the bike can result in seizing the motor.
Answered by james718
do you have to use it with a FMF silencer?
Asked by kx85r1d3r, AL
The fatty pipe can be used with the stock or FMF silencers.
Answered by james718
No, but the sound and powerband will both benefit from using both parts of the exhaust.
Answered by Codeman111, 0REG0N
I am looking to upgrade the exhaust on my GASGAS EC200, 06 model,, do FMF make a pipe and silencer to fit? Cheers, Joe
Asked by WANNABESURFER2003, PLYMOUTH, DEVON
I looked on FMF's website and there is no signs of pipes or silencers made for an EC200 2006 model. You could try giving them a call 310.631.4FMF
Answered by AnthonyC, Portland, OR
does this pipe smooth out the powerband?
Asked by cordless, florida
Yes, this pipe smooths the power band out so it's going to be a little more consistent on the power all the way through the throttle.
Answered by Drewski, P+RTLAND
Will this pipe rust when water gets on it?
Asked by goodall
These pipes will rust if exposed to water/moisture. The best solution to keeping the pipe from rusting is WD40 and a scotch brite pad.
Answered by james718, Portland, OR
Do i have to change the jetting?
Asked by crrider177
Jetting will more than likely be necessary. If you log onto FMF website you might find some jetting specs for your bike.
Answered by james718, Portland, OR
Rejet 07 KX100
Asked by ScottG
I don't know, I'd contact FMF.
Answered by james718, Portland, OR
Trail Rider
Asked by Murphster, Bozeman, MT
ya definetly get the gnarly if your planing on doing serious trail riding it will get you outa some serious terain with the torque it gives a bike
Answered by morin, ct
Does an fmf fatty exhaust come with factory "dents" or indentations towards the silencer?
Asked by rjp44
Just like Morin says, this dent is more than likely a clearance dent.
Answered by james718, Portland, OR
no its supose to be there they'll usually put some dents on the side near the motor to make it fit easyer
Answered by morin, ct

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