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FMF Fatty Pipe - 2-Stroke
FMF Fatty Pipe - 2-Stroke

$197.99 - $359.99
10% Off - Save up to $40.00

Item #FMF001X

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103 Reviews
4.8 out of 5 stars
5 Star   87 4 Star   14 3 Star   0 2 Star   1 1 Star   1
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All Reviews
New York
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Amazing

Amazing power and sound, came is the best shape.

Verified Purchaser
Macedon, NY 14502, USA
Durability 3/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
More low end on yz 125

Really woke up power across the board. I was most suprised with the added low end grunt. With some clutch play I can crawl through some gnarly single track I couldn't before. Highly reccomend.

FMF Fatty Pipe - 2-Stroke
FMF Fatty Pipe - 2-Stroke
Verified Purchaser
Cedar Rapids, IA, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Awesome Pipe

We have run these on all of my son's Kawasaki race bikes, love the sound and the increase in power.

Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Huge gain in performance

Bought this for my sons Ktm 65sx. The stock pipe sounded like a skill saw and had a narrow powerband. The Fatty pipe changed the power and sound tremendously. I'm talking a true 2-stroke sound now with this pipe instead of the stockers annoying buzz. Add the powercore silencer and it gets even better.

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 4/5
Great product

i got this pipe for my 1998 cr250 when it came in the box was in bad shape but the pipe was excellent other than a minor scratch on the pipe good product

Top 250 Contributor Verified Purchaser
Indiana, USA
Durability 5/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 5/5
Better results than what I had thought.

I bought this pipe hoping to get some low end torque for my 2017 YZ125 which in stock form is non existent. At $215.00 it isn't a bad price for what you get, I went ahead and got the Moose pipe guard to help protect my investment which put my total up to $350.00.
I already had a FMF Powercore 2 silencer so I thought mounting the pipe would be easy... WRONG.
The mounting points did not want to line up at all. I finally got it on going from front to back not tightening the bolts down all the way and it still took everything i had to get the silencer bolt in.
When I rode the bike for the first time I immediately felt the low end grunt i had been hoping for.
It was far better than I had imagined.
I did not have to re jet my carb. If your bike is jetted correctly you shouldn't have to re jet.

Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

Great pipe, noticed more low end torque with my kx250 and it looks great to. You will need to reject your carbs but no big deal.

FMF Fatty Pipe - 2-Stroke
FMF Fatty Pipe - 2-Stroke
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
FMF Power!

Bought for KX85.. We dig it! Great power gains throughout and a good deal!

Huntersville, NC 28078, USA
Durability 4/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 4/5
Amazing Pipe!

Awesome pipe, installed it pretty easy. Made a huge difference in my power-band (I ride a 96kx125). Glad I bought this.

Verified Purchaser
Indy
Durability 4/5 Ease of Installation 4/5 Performance 5/5 Power 4/5 Style 5/5
Satisfied

( 99 cr250 ).
YOU MUST RE-JET both MAIN (178) and PILOT (42) jets and check your needle clip position (2nd) after installing this pipe. FMF has a convenient drop down menu for application selection.. If you do not rejet you will flood your motor out trying to start it AND you'll run WAAAAY too rich. I went from SST to the FATTY. Low end torque is PHENOMINAL!! felt like i was on a 4 stroke while crawling thru the woods. i kept going lower and lower on RPMs in the woods, it would not flame out on me, WOW! You will lose some of the top end, not for drag racing. HOWEVER, I am still tinkering with my jetting, I'm using stock silencer with fatty pipe.

FMF Fatty Pipe - 2-Stroke
FMF Fatty Pipe - 2-Stroke
See 10 More Reviews
90 Questions
Answered:   86
Not Yet:   4
Cr85kid
Q: Will this fit my 2006 Cr85 rb?
1 month 10 days ago
Alex
Top 10 Contributor
1 month 10 days ago
A: Yes it will! Be sure to put your Make/Model/Year in the fitment option before ordering, or call us anytime to place the order.
Tuck
Q: Will this fit on a 92 kx125
2 months 11 days ago
David
Top 10 Contributor
2 months 11 days ago
A: This will not fit your 1992 KX125.
Mark
Q: What is the tail end of the pipe measure
2 months 17 days ago
David
Top 10 Contributor
2 months 17 days ago
A: It will vary based on what bike you have.
QuadKid
Q: Does this include just the pipe and not a muffler?
3 months 19 days ago
I Have a 2000 Polaris Scrambler 400 4X4, and I was wondering if there was a pipe and muffler combo for my Quad. Does this pipe include a muffler, if not, where can I find one that fits my Quad?
David
Top 10 Contributor
3 months 19 days ago
A: This is only for the pipe. Unfortunately we don't offer a muffler and pipe combo for your ATV.
Tyler
Q: Just got a 2006 yz125 and was wondering if this smoothens out the power band enough to notice a difference. Right now it feels like a slingshot.
3 months 25 days ago
David
Top 10 Contributor
3 months 25 days ago
A: This will give you more bottom end. You might need to re-jet your carbs to smooth out the power band.
ismet
Q: Does the 2015 model ktm 250 exc fit?
Over 6 months ago
Does the 2015 model ktm 250 exc fit?
CustomerAccountManager
Top 500 Contributor
Over 6 months ago
A: Yes it will! You will have to profile a 2014 250xc to get it to pop up though. The only difference is the exc has a headlight. both 2 stroke.


feel free to give me a call.

Jason Robbins
Customer Account Manager
503-783-5613
Jdog
Q: Ive read that the mounts from the fatty dont line up excatly on a 1997 kx 250 and info on tha?
1 year 1 month ago
Looking to install fatty on it
Ttavis
Q: Wondering if it will fit my bike because when this pipe is hooked up it comes out on the right side but my stock pipe comes out on the left
1 year 1 month ago
jbam19
Top 100 Contributor
1 year 1 month ago
A: Yes it will fit the 1998 kx80, the photo is just representative and not the actual expansion chamber for your bike, it will come set up to whichever side came stock on the bike.
Grunt7
Q: I have a 2017 yz 250 2 stroke,what would be the best jetting or the bike?
1 year 1 month ago
MotoSportExpert
MotoSport Staff Expert
1 year 1 month ago
A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and 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.
Due to the variations that may come into effect when tuning an engine (i.e. pipes, intake, altitude, cams, displacement, standard or high compression pistons, etc.) we CANNOT offer jetting recommendations.
pash
Q: Hi would this fit a Yamaha RXZ135 2stroker
1 year 2 months ago
1 - 10 of 90
Fitment
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See Fitments
# Part Numbers
Product Variant Manufacturer Part #
FMF Fatty Pipe - 2-Stroke N/A
FMF Fatty Pipe - 2-Stroke 020375
FMF Fatty Pipe - 2-Stroke 021036
FMF Fatty Pipe - 2-Stroke 021048
FMF Fatty Pipe - 2-Stroke 021021
FMF Fatty Pipe - 2-Stroke 020378
FMF Fatty Pipe - 2-Stroke 020020
FMF Fatty Pipe - 2-Stroke 021006
FMF Fatty Pipe - 2-Stroke 021040
FMF Fatty Pipe - 2-Stroke 021052
FMF Fatty Pipe - 2-Stroke 021000
FMF Fatty Pipe - 2-Stroke 021031
FMF Fatty Pipe - 2-Stroke 021044
FMF Fatty Pipe - 2-Stroke 023049
FMF Fatty Pipe - 2-Stroke 025073
FMF Fatty Pipe - 2-Stroke 025119
FMF Fatty Pipe - 2-Stroke 025130
FMF Fatty Pipe - 2-Stroke 025069
FMF Fatty Pipe - 2-Stroke 025006
FMF Fatty Pipe - 2-Stroke 025060
FMF Fatty Pipe - 2-Stroke 025091
FMF Fatty Pipe - 2-Stroke 025088
FMF Fatty Pipe - 2-Stroke 020050
FMF Fatty Pipe - 2-Stroke 022048
FMF Fatty Pipe - 2-Stroke 022003
FMF Fatty Pipe - 2-Stroke 020054
FMF Fatty Pipe - 2-Stroke 022015
FMF Fatty Pipe - 2-Stroke 022040
FMF Fatty Pipe - 2-Stroke 022052
FMF Fatty Pipe - 2-Stroke 020045
FMF Fatty Pipe - 2-Stroke 022000
FMF Fatty Pipe - 2-Stroke 022060
FMF Fatty Pipe - 2-Stroke 022006
FMF Fatty Pipe - 2-Stroke 022034
FMF Fatty Pipe - 2-Stroke 024023
FMF Fatty Pipe - 2-Stroke 023055
FMF Fatty Pipe - 2-Stroke 020107
FMF Fatty Pipe - 2-Stroke 023006
FMF Fatty Pipe - 2-Stroke 023018
FMF Fatty Pipe - 2-Stroke 023059
FMF Fatty Pipe - 2-Stroke 023000
FMF Fatty Pipe - 2-Stroke 020133
FMF Fatty Pipe - 2-Stroke 024041
FMF Fatty Pipe - 2-Stroke 024049
FMF Fatty Pipe - 2-Stroke 020147
FMF Fatty Pipe - 2-Stroke 024053
FMF Fatty Pipe - 2-Stroke 020149
FMF Fatty Pipe - 2-Stroke 020138
FMF Fatty Pipe - 2-Stroke 024000
FMF Fatty Pipe - 2-Stroke 020006
FMF Fatty Pipe - 2-Stroke 020014
FMF Fatty Pipe - 2-Stroke 020015
FMF Fatty Pipe - 2-Stroke 020017
FMF Fatty Pipe - 2-Stroke 020018
FMF Fatty Pipe - 2-Stroke 020048
FMF Fatty Pipe - 2-Stroke 020034
FMF Fatty Pipe - 2-Stroke 022044
FMF Fatty Pipe - 2-Stroke 020037
FMF Fatty Pipe - 2-Stroke 020039
FMF Fatty Pipe - 2-Stroke 020042
FMF Fatty Pipe - 2-Stroke 022012
FMF Fatty Pipe - 2-Stroke 020124
FMF Fatty Pipe - 2-Stroke 020127
FMF Fatty Pipe - 2-Stroke 020130
FMF Fatty Pipe - 2-Stroke 020143
FMF Fatty Pipe - 2-Stroke 020142
FMF Fatty Pipe - 2-Stroke 020135
FMF Fatty Pipe - 2-Stroke 024034
FMF Fatty Pipe - 2-Stroke 020137
FMF Fatty Pipe - 2-Stroke 020145
FMF Fatty Pipe - 2-Stroke 020150
FMF Fatty Pipe - 2-Stroke 020087
FMF Fatty Pipe - 2-Stroke 023037
FMF Fatty Pipe - 2-Stroke 020088
FMF Fatty Pipe - 2-Stroke 020089
FMF Fatty Pipe - 2-Stroke 020092
FMF Fatty Pipe - 2-Stroke 020104
FMF Fatty Pipe - 2-Stroke 020105
FMF Fatty Pipe - 2-Stroke 020109
FMF Fatty Pipe - 2-Stroke 020390
FMF Fatty Pipe - 2-Stroke 025019
FMF Fatty Pipe - 2-Stroke 025052
FMF Fatty Pipe - 2-Stroke 025040
FMF Fatty Pipe - 2-Stroke 025151
FMF Fatty Pipe - 2-Stroke 021058
FMF Fatty Pipe - 2-Stroke 025092
FMF Fatty Pipe - 2-Stroke 025115
FMF Fatty Pipe - 2-Stroke 025145
FMF Fatty Pipe - 2-Stroke 025150
FMF Fatty Pipe - 2-Stroke 025159
FMF Fatty Pipe - 2-Stroke 025182
FMF Fatty Pipe - 2-Stroke 025197
FMF Fatty Pipe - 2-Stroke N/A
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