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Add silencer?

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I have a 2006 YZ450 with a Big Gun EVO-R exhaust, when I purchased the bike the previous owner did not have the silencer that comes with the pipe in I have added the silencer as well as the spark arrester as I need to meet sound levels for GNCC the bike seems to want to stall out at idle once and a while as while there seems to be some power loss, I would assume adding this has caused the bike to run richer. Where should I start to adjust jetting?

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