Is the stock silencer an approved spark arrestor? Can't see where it says so on it.
Oops, sorry for duplicate topic, mods delete one please
my 09 wr450 stock is. it says something about the forest service on the side closest to the rear tire.
My 07 had a big screen inside it
Yes the stock silencer is a spark arrestor. It's stamped on the inner side near the muffler.
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