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2003 Polaris PREDATOR 90

FMF Fatty Pipe - 2-Stroke

FMF Fatty Pipe - 2-Stroke - Main
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FMF Fatty Pipe - 2-Stroke - Main
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Retail: $229.99
$209.99
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Product Description

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.

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(65)
4.7 out of 5 stars
5 star   53
4 star   10
3 star 0
2 star   1
1 star   1
Write a Review
“ I have the FMF Fatty and powercore 2 silencer on my 1999 yz 125 and it is definetly the best pipe yet... ”
YZalltheway
“ I bought a fmf fatty for my kids kx 85 it hung 3 inches below the frame his second ride he came up sh... ”
CORN55 Location: lewiston id
“ This is probably my 4th FMF pipe to own from 80cc bikes to 250cc. ”
ActionSportsEnth Location: Kingwood, TX
1-10 of 65
Overall
Durability
Ease of Installation
Performance
Power
Style
Best two stroke pipe
I have the FMF Fatty and powercore 2 silencer on my 1999 yz 125 and it is definetly the best pipe yet. I used to have a pro circuit but it would dent so easily and eventually it got so dented i couldn't use it. I switched to the FMF Fatty and the bike had noticeably more power and sounded a lot better to. Also the fmf pipe is incredibly strong. My Fatty has one small dent and i have hit it much harder than my procircuit. FMF is definatly the best.
Overall
Durability
Ease of Installation
Performance
Power
Style
fmf fatty
fmf fatty stock pipe
Location: lewiston id
Kx 85
I bought a fmf fatty for my kids kx 85 it hung 3 inches below the frame his second ride he came up short on a double and it completely folded under the frame $224 kissed good bye. i have used fmf on all my bikes but dont recomend it on the kx 85 major flaw
Overall
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Kingwood, TX
FMF is the Best!
This is probably my 4th FMF pipe to own from 80cc bikes to 250cc. You cannot beat the quality that FMF puts into everything they build right here in the great USA! They have the best looking and most durable finish, plus you get that great deeper tone when finished off with a FMF Silencer. FMF does a great job on smoothing out the power band giving it a better linear range. I highly this product.
Overall
Durability
Ease of Installation
Performance
Power
Style
Location: AMARILLO TX
.LOTS OF POWER
I INSTALLED THE FATTY PIPE ON MY 1993 KDX 250 THE POWER THAT IT ADDS IS AMAZING .LOTS OF POWER THROUGH THE WHOLE POWERBAND
Overall
Durability
Ease of Installation
Performance
Power
Style
Location: chester,vA
Rust
i purchused the fmf fatty and it came in with rust on the WELD BEADS that is the only thing thats wrong you would expect no rust when you pay 220 dollars other than that greart product
Overall
Perfect for all around use
I bent my last pipe up against my frme, so i bought this one and couldnt be happier I only thing i could ask for is if FMF would make a works pipe for a 2002 CR250
Overall
Location: Longmont, CO
Night and Day Difference
Purchased this pipe for my 01 kx 250. HUGE difference over the stock pipe. It adds power throught out the entire powerband and is a great all around pipe.
Overall
Location: nv
Rideable
great finish and sound
Overall
Location: Georgia
Nice Pipe
This is a good pipe. It noticeably improves performance and is durable. My old fatty lasted years with many repairs, but was finally due for a replacement. You can't go wrong with this pipe.
Overall
Location: Rivesville, WV
Fatty
Wow!!!! This is the best money I have ever spent!!!! The fatty totally transformed my yz250. I cant keep the front tire on the ground!! Way more power than i had with my stock pipe I would recommend this pipe for anybody who wants to unleash the true demon in their 2 stroke.
1-10 of 65
Total Questions (25)
Questions with answers:
  25
Questions without answers:
0
Have a question?
“ Switching from a gnarly to a fatty on a yz250 will i have to rejet?... ”
33GITSERDONE Location: San Jose, CA
“ Is this pipe a bottom end or top end pipe?... ”
tomevs
“ How to re jet?... ”
zachd Location: NY,NY
1-10 of 25
River 2 years 11 months ago
Will this fit a 09 rm85?
what are the steps of putting it on well what do i hve to do after i put it on ? (i heard somthing about rejetting)
MotoSport Staff
2 years 11 months ago Location: P+RTLAND
All you do is unbolt your stock pipe and put this back on the way you took your stock one off. Most likely you will need to have your carb re-jetted as well and depending on where you are located and what mods you have done to your bike, normally the best place to get recommendations on jetting is at your local shop.
Answer this Question
Top 1000 Contributor
33GITSERDONE Over 3 years ago Location: San Jose, CA
Switching from a gnarly to a fatty on a yz250 will i have to rejet?
ive heard that the gnarly and the fatty are the same and ive heard that theyre different so i wanted a straight answer. i had the jetting spec sheet from fmf for my bike that came with the gnarly but i cant find it but i recall the jetting being the same but im not 100%
Over 3 years ago Location: RED LODGE MT
EXACTLY the same
Answer this Question
tomevs Over 3 years ago
Is this pipe a bottom end or top end pipe?
there are many reviews on this pipe, some saying that it increases the bottom end, and some saying that it decreases the bottom end and makes you'r bike a screamer. I am looking for bottom end, for enduro riding, is this pipe the one? (for a suzuki rm 125)
Expert MotoSport Staff
Over 3 years ago Location: USA
this will be the closet you'll find to get any improvements on the bottom end. Since FMF has discontinued the Gnarly pipe, they don't leave off-roader's many options. Your best bet is to look into a heavier fly wheel for a good low end improvement. Makes it great for trail riding and keeps the motor from stalling at low revs.
2 years 12 months ago
I say yes i installed it for the same reasons but get the shorty pipe for even more bottom end!
Answer this Question
zachd Over 3 years ago Location: NY,NY
How to re jet?
i got this and the powercore2 on my ktm 125. since i put this on my bike it doesnt have a powerband at all. what jet size should i use or is it not the jet? i live in new york fairly close to sea level and mild humidity.
MotoSport Staff Expert
Over 3 years ago Location: USA
For liability reason we do not give jetting recommendations. But FMF has a really easy jetting spec page on their website. check it out here: http://www.fmfracing.com/TechSupport/JettingCenter
Answer this Question
tylerhgh Over 3 years ago
Do i have to do any thing with the jets if i get this pipe on a honda cr125r 2005?
Top 1000 Contributor
Over 3 years ago Location: Lynnwood, WA
Any time you change the amount of airflow in or out of the engine you will have to make sure it is jetted right. You will likely have to increase the size of your main jets if you install this pipe.
2 years 12 months ago
probably not my 125 stayed the same!
Answer this Question
rjp44 Over 3 years ago
Does an fmf fatty exhaust come with factory "dents" or indentations towards the silencer?
i bought a fatty exhaust for a 02 cr125 and it came with a dent towards the silencer, i was unsure if it was factory to go around the motor or was it an actual dent
Top 100 Contributor
Over 3 years ago Location: ct
no its supose to be there they'll usually put some dents on the side near the motor to make it fit easyer
Expert MotoSport Staff
Over 3 years ago Location: Portland, OR
Just like Morin says, this dent is more than likely a clearance dent.
Answer this Question
Murphster Over 3 years ago Location: Bozeman, MT
Trail Rider?
I almost exclusively ride trails (rocks, roots, hills and trees) I would rather have more low-end torque then an "even power band" So should I think about getting an FMF Gnarley instead of this FMF Fatty? I have an FMF Fatty right now but it just bit the dust.
Top 100 Contributor
Over 3 years ago Location: ct
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
Answer this Question
ScottG Over 3 years ago
Rejet 07 KX100?
FMF page lists a 06 KX80 reject specs for the Fatty but does not list an 07 KX100 specs...any reason?
Expert MotoSport Staff
Over 3 years ago Location: Portland, OR
I don't know, I'd contact FMF.
Answer this Question
crrider177 Over 3 years ago
Do i have to change the jetting?
if i put this pipe on my bike do i have to change the jetting, i have a 2003 honda cr125?
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR
Jetting will more than likely be necessary. If you log onto FMF website you might find some jetting specs for your bike.
Answer this Question
goodall Over 3 years ago
Will this pipe rust when water gets on it?
or should i get some protective stuff to keep it from rusting, if so what should i get?
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR
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.
Answer this Question
1-10 of 25

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