had to have a spark arrestor to satisfy Forest service requirement. this was an easy, relatively cheap fix.
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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
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
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.
To find the correct size, we will need to know the year, make, and model of your motorcycle, and which FMF muffler you have.