February 3, 20197 yr Sportsawyer They spoke about changing jets sizes (orifice) to accommodate lower engine braking. I also believe that they updated the reed valve materials somehow the part number should reflect that. Not sure it would get that's specific as it is year model backward compatlbe. Not 100% sure as that is what I had heard back then. Could be a translation missenterpretation from Japanese to English ? .
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