Hi everybody I'm new here.Sorry for my english I speak french.Ok I buy a 2001 kx 500 an a have a new rebuilt crank and top end.I have boyesen radvalv(new) full fmf gnarly pipe and a E-LINE stator.I m running 175 mainjet ,58 pilot ,3rd clip.I run 15-47 gearing on mid-hard terrain an run 85mph.An today 15-43 an only 89mph.Since the beginning I think this bike is not as is well.Any body can help me?Every body tell this his a monster when they see the bike but I m not sure of that .I think the powervlve work good I chek it it the cover off an the rod seem to work when I turn the gas on at neutral.I m not''mecanik man''Thanks