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mdek

jetting

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I just changed my pipe on my 2000 wr to a fmf powercore 4sa. They told me to change my main jet from a 165 to a 168 and then change the pilot air screw to 2 3/4 turns out. Just riding up my road the bike seems to run great. My question is when I took out the 165 it said 165s what does the s designate.

just trying to learn

thanks guys

Mark

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