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spark arrestor?

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i recently got a used 2003 yz250f for a DRD step system exhaust,i dont think it is spark arrested?the is no little "fencing" type thing when you look into the pipe,its just a straight big hole.if i buy a spark arrestor for it,will i have to rejet or will this sacrifice performance?

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i recently got a used 2003 yz250f for a DRD step system exhaust,i dont think it is spark arrested?the is no little "fencing" type thing when you look into the pipe,its just a straight big hole.if i buy a spark arrestor for it,will i have to rejet or will this sacrifice performance?

if there is 3 allen screws on the back end cap then it had a spark arrester at one point. you can buy the replacement from dr.d. .the full race cans from dr.d have the end cap welded on. i barely felt a power differnce when i ran spark arrester insert on mine. you should not need to rejet. the only instruction i had when bought new dr.d pipe was to raise the needle position one mark.

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