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FMF Factory 4.1 Spark Arrestor Insert
FMF Factory 4.1 Spark Arrestor Insert

$ 26.99 $29.99
10% Off - Save $3.00

Item #FMF0001

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6 Reviews
4.8 out of 5 stars
5 Star   5 4 Star   1 3 Star   0 2 Star   0 1 Star   0
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All Reviews
Verified Purchaser
Ease of Installation 5/5 Style 5/5
Exact fit. easy install

had to have a spark arrestor to satisfy Forest service requirement. this was an easy, relatively cheap fix.

Verified Purchaser
San jose,ca
Durability 5/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 5/5
Does not fit a klx110l

Its a well build spark arrest and will work great on proper bike but dont buy if its for a fmf 4.1 on a klx110

Verified Purchaser
Ohio, USA
Durability 5/5 Ease of Installation 4/5 Performance 4/5 Power 4/5 Style 4/5
2007 YZ250F Spark Arrestor

Needed this to ride down at Hatfield Mccoy. Mildly changes the sound of bike but barely noticeable. Had to file the screw hole on the arrestor to fit the screw into the original hole that is on the exhaust. No big deal. It fits and it works for intended use.. no complaints.

Verified Purchaser
Durability 3/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

battle creek
Very easy to install

bought this spark arrestor insert because I needed it for a trip to the sliver lake sand dunes. It was a very fast install which was one bolt and it worked great all weekend. Good buy

Santa Maria, CA
Great purchase

The FMF spark arrestor was very simple to install, just had to unscrew a bolt in the end of the silencer and install the spark arrestor and screw the bolt back on.

Very simple, and it made my bike legal for enduro competition.

24 Questions
Answered:   22
Not Yet:   2
Q: What is the OD of the 2 flanges for this S/A? And is it physically stamped USFS?
Over 5 months ago
Ride 177
Over 5 months ago
A: Yes it is stamped USFS approved. Face flange is 2 3/16" OD. Can't tell you what exact bore is, thinking around 1 7/8"OD(went in with block of wood and hammer, otherwise I would pull it out for exact OD) but the housing is 1 3/4" ID where the 2 screen holding pipes press in to it. Hope this helps.
Top 10
Over 5 months ago
A: The FMF Factory 4.1 Spark Arrestor Insert is model specific and available in a variety of sizes to fit each particular FMF Factory 4.1 muffler.
To find the correct size, we will need to know the year, make, and model of your motorcycle, and which FMF muffler you have.
Q: Ordered fmf without spark arrestor, can I put it on?
1 year 7 months ago
I just ordered my fmf powercore 4 exhaust for my 02 Honda xr100, but when I ordered it I didn't realize I got the option without the spark arrestor. So I was wondering if I got this would I be able to just add it on myself? And if so how is it installed?
Q: I have a 2003 yz250f with stock exhaust
1 year 9 months ago
im pretty sure i have stock exhaust on my yz250f will this fit it?
Q: Needing a factory spark arrestor setup or something that I can put in my factory muffler on my 09 crf 150f
1 year 9 months ago
1 year 9 months ago
A: This will only fit the fmf factory 4.1 for most aftermarket pipes the manufacturer makes spark arrestors for it so whatever brand and model header you have that's the spark arestor you want to get for it
Q: Will this fit?
1 year 10 months ago
I have a stock 2016 suzuki rmz450. Will this fit?
1 year 10 months ago
A: No it will only fit the fmf factory 4.1
1 year 10 months ago
A: No it only works on the fmf factory 4.1 exhaust that only nothing else
Q: Do I need to get 2 of these for my 4.1 dual system for 2013 crf 450?
2 years 9 months ago
MotoSport Staff Expert
2 years 9 months ago
A: Yes you would need two for the dual system. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Q: Need a spark arrestor for a factory muffler
Over 3 years ago
hello my bike is a honda 2004 xr250r. factory pipe i need a spark arrestor for the factory pipe, which one or ones will fit? thank you alen
MotoSport Staff Expert
Over 3 years ago
A: You can find the stock spark arrestor for your 2004 Honda XR250R in our OEM section here: http://www.motosport.com/dirtbike/oem-parts/honda/2004/xr250r/muffler
Q: Will this fit a 4.1 r.c.t. muffler. The pic shown looks like a power core bolt in. The fmf r.c.t spark screen clips in with a circular clip. There is
Over 4 years ago
I have a 2012 kx450. Fmf 4.1 r.c. t muffler
Top 1 Contributor
Over 4 years ago
A: FMF makes a specific product for their RCT Muffler for your Kawasaki KX450F 2012 model.
Q: Will this fit my bike
Over 4 years ago
I have a 2006 yz250F it has FMF power bomb header and an unknown slip on muffler, Im hoping it is FMF or factory. any way to tell? need a spark arrester so I can register it. thanks
Top 1 Contributor
Over 4 years ago
A: The FMF Factory 4.1 Spark Arrestor insert is only designed to work with the FMF 4.1 exhaust systems. It will not work with the OEM 2006 YZ250F Yamaha or a different brand of exhaust system.
Q: Will this work on my 08 crf 450 with a powercore 4 ?
Over 4 years ago
Expert MotoSport Staff
Over 4 years ago
A: No. This insert will only work with FMF Factory 4.1 Exhaust Systems.
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# Part Numbers
Product Variant Manufacturer Part #
FMF Factory 4.1 Spark Arrestor Insert 040261
California Proposition 65

WARNING: This product contains chemicals known to the State of California to cause cancer, and birth defects or other reproductive harm. Wash hands after handling. For more information, go to www.P65Warnings.ca.gov.