Replacement spark arrestor for FMF Factory 4.1 and 4C exhaust.
Note: If purchasing a Spark Arrestor Insert for CRF250R FMF Factory 4.1 Dual Exhaust, you must purchase the FMF Titanium Powercore S/A Insert. The Factory 4.1 Spark Arrestor will not work with the Factory 4.1 Dual Exhaust without that part.
Note: NOT compatible with FMF Mini Factory 4.1 Exhaust.
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.
This will only fit your 2011 KTM 250sx-f, if you already have an FMF4.1 muffler installed. This will not fit a stock exhaust. If you have the stock exhaust and need to add a spark arrestor, you will need a Pro Moto Billet end cap that comes with the spark arrestor. Please make sure to profile your bike, so you receive the correct items specific to your bike for proper fitment.
There is a set screw holding the insert in the outlet of your exhaust, just remove the screw, pull the insert out, put the screen in and then the set screw to hold it in place.
It's pretty straight forward.