08' WR450 stock silencer/ spark arrestor

Is the stock silencer an approved spark arrestor? Can't see where it says so on it.

Is the stock silencer an approved spark arrestor? Can't see where it says so on it.

It should say so on the tire side of the muffler.

Says " Yamaha 5TJ-EO, Screen type,Yamaha YMS400B" Then a paragraph about noise decibels. Does not actually say spark arrestor or anything about  USFS

Yes it is USFS approved, and no it is not stamped in, as 'screen type' implies full compliance.

Cool, thanks, thought so but wasn't sure

Most of all of the rangeretts and ranger's just use a wire to check for a spark arrestor. My BBR say's forest approved but the sticker wont last long.

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