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JC311MX Added a reply to New to 2-Strokes and Jetting
8/12/2023 1:08pm I have a 2023 YZ250 that I am trying to figure all of this out as well. Stock jetting is 178/50 (I think), and after installing an FMF system I had my mechanic adjust mine to FMF's recommended spec:175/48. I ride small tracks in the Florida heat at sea-level. It doesn't bog, fires right up and it is a fire...
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