FMF Factory-4.1/4.1C Spark Arrestor

FMF Factory-4.1/4.1C Spark Arrestor
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FMF Factory-4.1/4.1C Spark Arrestor

Part# 1133820001

Our Price: $26.99

MSRP: $29.99 - You save $3.00 (10% off)

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  • Replacement spark arrestor for Factory 4.1 and 4C exhaust.
  • Simple to install.
  • USFS approved.

FMF Factory-4.1/4.1C Spark Arrestor Reviews

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3.9 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
3.0 / 5
5.0 / 5
Ease of Installation
5.0 / 5
5.0 / 5
5.0 / 5
Recommend it?
Yes (1)
3 / 5
5 / 5
Ease of Installation
5 / 5
5 / 5
5 / 5
Recommend it?
Easy installation, no loss of power or sound, stops sparks. Great product however its unfortunate these don't come packaged with the exhaust system for us woods riders. All in all though it works well

-m-2009 YAMAHA YZ250F--
September 19, 2017
Unadilla, NY, US
9 months ago
made it fit
i pounded off the outer ring and bolted into a arkropovic pipe... passed race tech and thats all that matters hahaha
October 6, 2015
Great product!
Easy to install and works great. Made my bike legal.
September 28, 2015
Good Product
Fit well and stops sparks, little more I can ask of it!
January 13, 2014
Westminster, CO, US
Perfect fit, easy to install
Fits perfect in 4.1 FMF exhaust. Quick easy install. Looks good too.
July 11, 2012
Las Cruces, NM, US
Fit good, looks cool.
Keeps sparks in and keeps me legal.
April 16, 2012
It Arrests Sparks
Seems to do a pretty good job. Does seem to reduce the hit, not exactly what I was looking for, but then again, I prefer riding without one.

Add some removable blue Loctite, don't over tighten, and you're good to go.
March 22, 2012
2009 crf450x
So far so good. I only have about 300 miles since installing it.
February 10, 2012
Mounting system for Spark Arrestor is terrible
A spark arrestor is a spark arrestor, but the way it mounts is what matters. FMF did a bad job with this one. You can only tighten them a little more than finger tight before it strips out and if you leave it loose it'll rattle looser and fall out. Bad design all together. I sold the whole pipe after no help from FMF.
November 30, 2009
Lacey, WA, US
Age: 25-44
161 - 190 lbs.
5'10 - 6'0
works great
makes my exhaust legal so I can do desert races. Cuts the sound a little too. I like it better than open.
October 13, 2009
Each question or answer submitted enters you into a:
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Browse 3 questions Browse 3 questions and 3 answers
What diameter pipe does this fit? I need to fit a SA to a non-current FMF Factory 4 exhaust with quiet core insert.
Michael A on Jun 1, 2017
Do I have to take off the end cap to install the spark arrestor?
Tyler C on Apr 10, 2017
BEST ANSWER: I purchased this screen for a Akrapovic slip one exhaust.
It fit tight, I had to tap it in
Will this spark arrestor fit on a 2008 CRF250R and or a 2015 CRF150R?
Randall D on Jan 23, 2017
BEST ANSWER: This is a replacement spark arrestor for the FMF Factory 4.1 and 4C exhaust. If you have the FMF Factory 4.1 or 4.1C this will fit.
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