wr 400 mods

I have a 2000 wr 400 I have changed main jet up 2 sizes and the idle jet 1 size.Removed the snorkle from the air box and installed FMF silencer.I have seen an o-ring mod on another post, what does this change and will I have to adjust the spray stream in the carb.They talk about using a video camera to measure the stream duration or is this a different mod? THANKS BRIAN

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